(19)
(11)EP 3 078 980 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
17.06.2020 Bulletin 2020/25

(21)Application number: 15162610.8

(22)Date of filing:  07.04.2015
(51)International Patent Classification (IPC): 
G01R 33/565(2006.01)

(54)

DYNAMIC EFFECTS CORRECTION IN MEDICAL IMAGING

DYNAMISCHE EFFEKTKORREKTUR IN DER MEDIZINISCHEN BILDGEBUNG

CORRECTION DES EFFETS DYNAMIQUES EN IMAGERIE MÉDICALE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(43)Date of publication of application:
12.10.2016 Bulletin 2016/41

(73)Proprietor: Siemens Healthcare GmbH
91052 Erlangen (DE)

(72)Inventors:
  • Bhat, Himanshu
    Cambridge, MA Massachusetts 02139 (US)
  • Kober, Tobias
    1004 Lausanne (CH)
  • Feiweier, Thorsten
    91099 Poxdorf (DE)
  • Prinz, Carsten
    91083 Baiersdorf (DE)
  • Splitthoff, Daniel Nico
    91052 Erlangen (DE)
  • Stöcker, Stephan
    91083 Baiersdorf (DE)

(74)Representative: Maier, Daniel Oliver 
Siemens AG Postfach 22 16 34
80506 München
80506 München (DE)


(56)References cited: : 
WO-A1-2007/106360
US-A1- 2012 268 124
US-A1- 2009 209 846
  
  • MURAT AKSOY ET AL: "Real-time optical motion correction for diffusion tensor imaging", MAGNETIC RESONANCE IN MEDICINE, vol. 66, no. 2, 22 March 2011 (2011-03-22) , pages 366-378, XP055031759, ISSN: 0740-3194, DOI: 10.1002/mrm.22787
  • DOLD C ET AL: "Advantages and Limitations of Prospective Head Motion Compensation for MRI Using an Optical Motion Tracking Device", ACADEMIC RADIOLOGY, RESTON, VA, US, vol. 13, no. 9, 1 September 2006 (2006-09-01), pages 1093-1103, XP028012632, ISSN: 1076-6332, DOI: 10.1016/J.ACRA.2006.05.010 [retrieved on 2006-09-01]
  • ZAITSEV M ET AL: "Magnetic resonance imaging of freely moving objects: prospective real-time motion correction using an external optical motion tracking system", NEUROIMAGE, ACADEMIC PRESS, ORLANDO, FL, US, vol. 31, no. 3, 1 July 2006 (2006-07-01), pages 1038-1050, XP024906396, ISSN: 1053-8119, DOI: 10.1016/J.NEUROIMAGE.2006.01.039 [retrieved on 2006-07-01]
  • WHITE N ET AL: "PROMO: Real-time prospective motion correction in MRI using image-based tracking", MAGNETIC RESONANCE IN MEDICINE, JOHN WILEY & SONS, INC, US, vol. 63, no. 1, 1 January 2010 (2010-01-01), pages 91-105, XP007916079, ISSN: 0740-3194 [retrieved on 2009-12-21]
  • SANTOS J M ET AL: "Flexible real-time magnetic resonance imaging framework", PROCEEDINGS OF THE 26TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE EMBS SAN FRANCISCO,CA, EMBS SAN FRANCISCO, CA, USA, vol. 3, 1 September 2004 (2004-09-01), pages 1048-1051, XP010774954, DOI: 10.1109/IEMBS.2004.1403343 ISBN: 978-0-7803-8439-2
  
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


Description


[0001] The present invention relates generally to the correction of artefacts appearing in images obtained by a medical imaging apparatus and coming from dynamic effects occurring during imaging of an object by said medical imaging apparatus.

[0002] It is well known by people skilled in the art that the effect of object motion when imaging an object by means for example of MRI techniques is a common problem which frequently degrades the quality of the MRI image of said object. It can be motion of the object itself or motion of a part, e.g. an internal part, of said object. More generally, effects changing the environment during the imaging process of an object to be imaged, like object motion or changes in the technical environment, are referred to as "dynamic effects". Said dynamic effects have the disadvantage of degrading the image quality of the resulting images notably by creating image artefacts, which might hamper clinical diagnosis or yield the need for rescanning the object, thus increasing healthcare costs and impeding patient comfort.

[0003] Several means to correct dynamic effects exist, aiming at mitigating the resulting image artefacts. Some of the techniques try to improve the images a posteriori (retrospectively), others try to change imaging parameters as, for example, the field-of-view (FOV) already during the medical image acquisition. Retrospective techniques which try to correct data impeded by said effects after they were acquired have the advantage to have minimal or no impact on the imaging process itself, but are unfortunately limited since some artefacts are not correctable a posteriori. Prospective correction methods, on the other hand, can adapt imaging parameters dynamically during the acquisition. Such a method is for instance described in the document US2009/209846B1. They typically require, however, considerable changes in the medical imaging control software or hardware. In case of the aforementioned US patent, for instance, an interface retrieves updated position information from a camera system and uses this information to update the acquisition parameters stored in a magnetic resonance imaging device.

[0004] An objective of the present invention is to provide a method and a device for automatically and dynamically optimizing image acquisition parameters and/or image acquisition commands (hereafter "image acquisition parameters / commands" - more generally, "x/y" means in the present patent application "x and/or y") of an imaging procedure performed by a medical imaging apparatus in order to mitigate artefacts resulting from dynamic effects occurring during image acquisition.

[0005] This objective is achieved according to the present invention with the method set forth in claim 1. In particular, the method may be a computer-implemented method, for automatically and dynamically optimizing image acquisition parameters and/or image acquisition commands of an imaging procedure performed by a medical imaging apparatus, e.g. a Magnetic Resonance Imaging (MRI) apparatus, in order to mitigate or cancel dynamic effects perturbing the image acquisition process of an object (or subject) to be imaged by said medical imaging apparatus, the latter comprising an imaging control system, a hardware control system and a medical imaging device, the imaging control system being configured for communicating to the hardware control system image acquisition parameters, the hardware control system controlling the medical imaging device according to said image acquisition parameters for performing the imaging procedure, the method comprising:
  1. a. connecting a Dynamic Correction Module (hereafter DCM) to the medical imaging apparatus, for example by using connectors and/or a logical connection, said medical imaging apparatus being preferentially a MRI apparatus configured for acquiring imaging raw data of the object according to a MRI procedure, wherein the DCM might comprise a software and/or a hardware component. Preferentially, the connection of the DCM to the medical imaging apparatus is a logical connection, wherein the DCM is for example a software that comprises programming instructions for enabling the DCM to acquire/collect/send/receive data from the medical imaging apparatus, e.g. from a processing unit of the medical imaging apparatus, and/or from a memory, and/or from an Analog-to-Digital converter, and/or from another software of the medical imaging apparatus, the method according to the invention being in this case preferentially a computer implemented method;
  2. b. automatically acquiring/collecting by the DCM through its connection to the medical imaging apparatus image acquisition parameters and/or commands defined by and in the imaging control system for performing the imaging procedure projected by the medical imaging apparatus for imaging said object, as well as data about dynamic changes or effects (hereafter "dynamic change data"), wherein said image acquisition parameters and image acquisition commands are respectively data and control commands configured for controlling the medical imaging device of the medical imaging apparatus by means of the hardware control system, the image acquisition parameters/commands defining at least one part, in particular the entire, imaging procedure (e.g., in the context of MRI, image acquisition parameters/commands might be related to real-time events like gradient pulse events, RF pulse events, RF acquisition events) and the dynamic change data being data related to the detection or measurement of a dynamic effect that might degrade the quality of the image obtained for said object by means of the medical imaging apparatus, each dynamic change data comprising in particular information about a motion of at least one part of said object (said part of the object defining for example a volume for which the MRI apparatus will measure an activity, e.g. a brain activity for a part or certain volume of said brain), and/or a technical change such as a drift of the magnetic field or a technically induced change of a RF pulse flip angle in case of an MRI apparatus, and/or an environmental change within the examined part or volume or the imaged object itself such as a change in field homogeneity (shim) in case of an MRI apparatus, the dynamic change data being acquired by the DCM from one or more sources, such as a field probe in case of an MR scanner and/or a respiratory belt to monitor a subject's/patient's respiration and/or a motion detection device (e.g. a camera), of the medical imaging apparatus, through said connection to the medical imaging apparatus or through a direct connection to each of said sources, wherein each source is configured for measuring/detecting at least one dynamic effect;
  3. c. automatically determining or calculating in real time, by means of the DCM, at least one new image acquisition parameter/command from the image acquisition parameters/commands defined in the imaging control system and the dynamic change data, wherein said new image acquisition parameter/command is preferentially one of the image acquisition parameters/commands defined in the imaging control system (called hereafter "the corresponding image acquisition parameter/command"), but optimized for the dynamic change occurring during imaging the object - in other words, it is an adapted/corrected version/value of the image acquisition parameter/command defined in the imaging control system -, while the corresponding image acquisition parameter/command defined in the imaging control system remains unchanged, i.e. while the corresponding image acquisition parameter/command defined or stored in the imaging control system remains free of any optimization/adaptation, notably in function of said dynamic change data;
  4. d. automatically providing, by means of the DCM, the new image acquisition parameter/command to the hardware control system. Advantageously, image acquisition parameters/commands defined in the imaging control system are thus adapted or corrected in real time by the DCM in function of said dynamic change data before being processed by the hardware control system in order to perform an imaging procedure and to control the medical imaging device according to the new image acquisition parameter/command.


[0006] According to the present invention, the new image acquisition parameter/command is an image acquisition parameter/command defined in the imaging control system and optimized for the dynamic change occurring during imaging the object. The adaptation/change/correction of the image acquisition parameters/commands that define the imaging procedure is, according to the present method, free of any adaptation/change/correction of the image acquisition parameters/commands that are defined in the imaging control system, e.g. in a software or hardware of the imaging control system. The DCM according to the invention is thus capable of adapting, preferentially automatically adapting, the imaging acquisition parameters/commands in real-time in function of the dynamic change data in a manner free of any change in the execution/running of a software or hardware of the imaging control system whose purpose is the execution of the imaging procedure.

[0007] Advantageously, the present invention completely decouples the imaging control module/layer, i.e. the process controlled by programmed instructions of the software or hardware of the imaging control system for defining and controlling the imaging procedure within the imaging control system during imaging acquisition, e.g. a MR sequence in MRI, and the correction/optimization process performed by the DCM, so that it becomes possible to apply the correction/optimization performed by the DCM to any imaging procedure without or with very little additional efforts. Indeed, the DCM according to the invention comprises in particular several optimization procedures/models for optimizing image acquisition parameters/commands in function of dynamic changes reported by the dynamic change data. Indeed, the DCM according to the invention may comprise in particular a memory for storing one or several models, each designed for mitigating the effect of a specific dynamic change during image acquisition, e.g. the motion of the object during image acquisition, by determining said new image acquisition parameters/commands and adapting in real time the imaging procedure of the medical imaging apparatus to the new image acquisition parameters/commands.

[0008] The present invention also concerns a DCM as defined in claim 8, configured for optimizing in real time image acquisition parameters/commands of an imaging procedure performed by a medical imaging apparatus for imaging an object, the DCM comprising:
  • connectors for connecting, e.g. logically and/or physically connecting, the DCM to the medical imaging apparatus, for example the connectors are logical connectors and the DCM is a software and/or comprises programming instructions stored in a memory;
  • a processing unit for processing dynamic change data and image acquisition parameters/commands;
  • a computer readable medium comprising a memory for storing computer executable instructions, that, when executed, cause the processing unit to perform steps b-d previously described, said computer executable instructions comprising at least one, preferentially several optimization procedures for optimizing the image acquisition parameters/commands in function of dynamic changes occurring in real time during imaging of said object by means of the medical imaging apparatus, wherein preferentially each optimization procedure is configured for mitigating one or several dynamic effects.


[0009] Finally, the present invention also concerns a MRI apparatus for imaging an object, said MRI apparatus comprising the DCM.

[0010] The present invention proposes thus a method and a device, the so-called DCM, that is configured for cooperating with a medical imaging apparatus like a MRI apparatus in order to correct for dynamic effects occurring during a medical imaging exam and that may impede the resulting image quality. The present invention advantageously facilitates the implementation of correction methods for different perturbing dynamic effects like motion, hardware-induced environment changes, physiological changes, etc., in a single device, i.e. said DCM, that has a unified interface for cooperating with the medical imaging device and with other devices providing said dynamic change data. Compared to prior art techniques, the present invention also avoids the requirement of separate correction of the dynamics effects, since they can all be corrected in a single step by means of the present invention.

[0011] The claimed invention will be best understood from the following detailed description of specific embodiments when read in connection with the accompanying drawings:
Figure 1
schematic illustration of the claimed method.


[0012] The present invention will be described now by taking two specific examples of dynamic changes, respectively motion and frequency drift occurring during an examination in an MRI apparatus, in relation with Figure 1. The two specific examples only serve as illustration of the present invention. The skilled man will recognize that the present invention applies to other dynamic changes in a similar way.

[0013] Prior art medical imaging apparatus typically comprises an imaging control system 1, a hardware control system 2, and a medical imaging device 3 that interacts with the object to be imaged. The imaging control system 1 usually includes a user interface and control modules for defining an imaging procedure characterized by image acquisition parameters and commands configured for implementing the imaging procedure by means of the medical imaging device 3. The imaging control system 1 controls the hardware control system 2 and communicates to the latter the image acquisition parameters/commands for performing the imaging. The hardware control system 2 provides and receives information from the medical imaging device 3 in order to execute the imaging procedure defined by the image acquisition parameters/commands provided by the imaging control system 1. The present invention introduces to this known working schema a new transparent layer that is the DCM 4 which is configured for interacting at least with the imaging control system 1 and the hardware control system 2 for optimizing the imaging procedure.

[0014] In case of motion correction, a set of image acquisition parameters/commands is in particular related to the "field of view" (FOV), for example the image acquisition parameters of said set are geometric information (position and orientation) of the volume to be imaged (e.g. a part of the object to be imaged). If the examined object or at least one part of said object moves during the imaging procedure, the previously defined FOV is rendered invalid with respect to the original planning. Special devices or software modules known in the art might be used for detecting object motion, monitoring the object part under examination and updating accordingly the geometric information. Dynamic change data characterizing the detected motion of the object or of a part of the object, e.g. an object motion trajectory, is then transferred to the DCM by said special device or software module configured for detecting the object motion and with which the DCM might communicate. In this particular case, the dynamic change data comprises updated geometric information related to the FOV related to the detected motion of the imaged object. After reception of the dynamic change data, the DCM is then capable of determining new image acquisition parameters/commands related to the FOV from said dynamic change data, the new image acquisition parameters/commands allowing to move the FOV of the imaging procedure so that, for example, the FOV is moved according to the measured object motion trajectory, effectively "following" the object or object part's movement with the FOV. In particular, if the medical imaging apparatus is a MRI apparatus, the newly determined image acquisition parameters/commands that will optimize the imaging procedure according to the object/object part motion are configured for adapting a rotation matrix defining the gradient coordinate system as well as adapting frequency and phase associated with excitation and demodulation imaging procedures. Finally, the new image acquisition parameters/commands are transferred or sent by the DCM 4 to the hardware control system 2 which performs the image acquisition based on the new image acquisition parameters/commands which have been optimized by the DCM 4 for the currently object/object part motion. The previously described method happens during the acquisition process of the image by the medical imaging apparatus, i.e. in real-time.

[0015] Advantageously, the DCM 4 is transparent for both the image control system 1 and the hardware control system 2, in that none of them has to be changed to implement the motion correction previously described. In other words, the DCM 4 is transparent to the parts of the imaging control system 1 previously defining the image acquisition parameters/commands as well as the parts of the imaging control system 1 controlling the hardware control system 2.

[0016] In case of frequency drift correction in an MRI apparatus, the DCM 4 is able to determine new acquisition parameters/commands configured for adapting the MRI apparatus scanner's centre frequency in order to correct frequency drifts caused by technical effects or physiological activity of the imaged object part (e.g. respiration or heart beat). In this case, an acquisition parameter might be the scanner frequency, which might be in particular regularly measured by a special device or software module. Information about the measured scanner frequency might be then fed into the DCM 4 as dynamic change data. According to the present invention, the DCM 4 could comprise an optimization model correlating the measured scanner frequencies (i.e. the dynamic change data) and the acquisition parameters/commands in order to determine new acquisition parameters/commands that will adapt/correct the imaging procedure for mitigating the effects of frequency drift. Again, by using a DCM augmented by a model, the image control parameters/commands can be changed transparent to the imaging and hardware control modules or software layers. Hereby the model provides the information to relate measured frequency drifts to the corrections of the imaging parameters/commands needed to compensate those drifts.

[0017] In particular, the DCM 4 according to the present invention comprises at least one interface for another software or hardware module configured for receiving dynamic change data from said software or hardware module, which might be for example a motion correction camera, and/or physiological sensors 52 like a respiration belt, and/or other sensors measuring technical dynamic effects 51 like magnetometers, and/or software modules measuring dynamic effects 53, for example software modules capable of processing specific "navigator" data acquired by the medical imaging device 3 for obtaining dynamic change data, i.e. information about a dynamic effect. The DCM 4 is configured for collecting and processing the dynamic change data provided by the above-mentioned sources of dynamic change data, for example by using an optimization model relating the received dynamic change data to the new image acquisition parameters/ commands in order to correct/adapt the image acquisition parameters/commands (e.g. hardware commands) received from the imaging control system 1 and to send to the hardware control system 2 optimized image acquisition parameters/commands, i.e. said new image acquisition parameters/commands determined in real time by the DCM 4 in function of the dynamic change data.

[0018] Advantageously, the DCM 4 according to the invention might be specifically configured for correcting a single dynamic effect, another DCM 4 according to the invention being specifically dedicated to the correction of another single dynamic effect. Each DCM 4 correcting a specific dynamic effect might be replaced by another DCM 4 for correcting another specific dynamic effect or might be used together with said another DCM so that two specific dynamic effects might be corrected. A single DCM might also correct several specific dynamic effects. In particular, several DCMs might be concatenated, each of the DCMs either compensating a part of a certain effect or each DCMs correcting a distinct effect.

[0019] According to the present invention, the DCM 4 is configured for centralizing all dynamic change data related to dynamic effects that might deteriorate the image quality in order to dynamically correct acquisition parameters/commands by calculating/determining new acquisition parameters/commands. Due to said centralization, the DCM 4 is in particular able to combine information from different input sources, i.e. to combine dynamic change data acquired through different sources (e.g. a camera and another software module). Advantageously, combining information from different sources allows optimizing the correction of the imaging procedure for a specific, in particular single, dynamic effect. Indeed, complementary information might be found from the different sources.

[0020] Preferentially, each communication between the imaging control system 1 and the hardware control system 2 which are free of data related to a dynamic effect is bypassed by the DCM 4.


Claims

1. A method for automatically and dynamically optimizing image acquisition parameters and/or commands (hereafter "parameters/commands") of an imaging procedure performed by a medical imaging apparatus in order to mitigate or cancel dynamic effects perturbing the image acquisition process of an object to be imaged by said medical imaging apparatus, wherein the image acquisition parameters/commands are configured for controlling a medical imaging device of the medical imaging apparatus by means of a hardware control system (2) of the medical imaging apparatus, the method comprising:

a. connecting a Dynamic Correction Module (hereafter DCM) (4) to the medical imaging apparatus;

b. automatically acquiring by the DCM (4)

- data about dynamic changes or effects (hereafter "dynamic change data"), wherein the dynamic change data are acquired by the DCM (4) from one or more sources of the medical imaging apparatus, wherein each source is configured for measuring or detecting at least one dynamic effect; and

- image acquisition parameters/commands defined by an imaging control system (1) of the medical imaging apparatus;

c. automatically determining in real time, by means of the DCM (4), at least one new image acquisition parameter/command from the dynamic change data and the image acquisition parameters/commands defined in the imaging control system (1), the new image acquisition parameter/command being one of said image acquisition parameters/commands defined in the imaging control system (1), but optimized for said dynamic change, while the image acquisition parameter/command defined in the imaging control system and corresponding to said new image acquisition parameter/command remains free of any adaptation to the dynamic change data;

d. automatically providing, by means of the DCM, the new image acquisition parameter/command to the hardware control system.


 
2. Method according to claim 1, wherein the dynamic change data are data related to the detection or measurement of a dynamic effect that might degrade the quality of the image obtained for said object by means of the medical imaging apparatus.
 
3. Method according to claim 1 or 2, wherein each dynamic change data comprises information about a motion of at least one part of said object, and/or a technical change of the medical imaging apparatus or parts of it, and/or an environmental change of the imaged volume or the imaged object/subject.
 
4. Method according to claim 1, wherein the DCM (4) is configured for combining dynamic change data of at least two sources for optimizing the correction of the imaging procedure for a single dynamic effect.
 
5. Method according to one of the claims 1 to 4, wherein the image acquisition parameters/commands are defined by an imaging control system (1) of the medical imaging apparatus for performing the imaging procedure projected by the medical imaging apparatus for imaging said object.
 
6. Method according to one of the previous claims, wherein the image acquisition parameters/commands define at least one part of the imaging procedure.
 
7. Method according to one of the previous claims, wherein the medical imaging apparatus is a Magnetic Resonance Imaging apparatus and the image acquisition parameters/commands are data/commands about a gradient pulse, and/or a radio frequency pulse, and/or a radio frequency data sampling.
 
8. Dynamic Correction Module (hereafter DCM) (4) for optimizing in real-time image acquisition parameters/commands of an imaging procedure performed by a medical imaging apparatus for imaging an object, the DCM (4) comprising:

- connection means for connecting the DCM (4) to the medical imaging apparatus;

- a processing unit for processing dynamic change data and image acquisition parameters/commands;

- a computer readable medium comprising a memory for storing computer executable instructions, that, when executed, cause the processing unit to perform steps (b) to (d) of one of the claims 1-7.


 
9. DCM (4) according to claim 8, wherein the computer executable instructions comprise several optimization procedures for optimizing the image acquisition parameters/commands in function of dynamic changes occurring in real-time during imaging of said object by means of the medical imaging apparatus, wherein each optimization procedure is configured for mitigating one dynamic effect.
 
10. DCM (4) according to claim 8 or 9, configured for combining the dynamic change data acquired from different sources of the medical imaging apparatus, wherein each source is configured for measuring/detecting at least one dynamic effect, the DCM (4) being further configured for combining the dynamic change data of at least two sources for optimizing the correction of the imaging procedure for a single dynamic effect.
 
11. Magnetic Resonance Imaging apparatus for imaging an object, said Magnetic Resonance Imaging apparatus comprising the DCM (4) according to one of the claims 8 to 10.
 


Ansprüche

1. Verfahren zur automatischen und dynamischen Optimierung von Bilderfassungsparametern und/oder -befehlen (im Folgenden "Parameter/Befehle") eines bildgebenden Verfahrens, das durch eine medizinische Bildgebungsvorrichtung ausgeführt wird, um dynamische Wirkungen, die den Bilderfassungsprozess eines durch die medizinische Bildgebungsvorrichtung abzubildenden Objekts stören, abzuschwächen oder aufzuheben, wobei die Bilderfassungsparameter/-befehle dazu konfiguriert sind, eine medizinische Bildgebungseinrichtung der medizinischen Bildgebungsvorrichtung mithilfe eines Hardwaresteuerungssystems (2) der medizinischen Bildgebungsvorrichtung zu steuern, wobei das Verfahren Folgendes umfasst:

a. Verbinden eines dynamischen Korrekturmoduls (Dynamic Correction Module, im Folgenden DCM) (4) mit der medizinischen Bildgebungsvorrichtung,

b. automatisches Erfassen durch das DCM (4) von

- Daten über dynamische Änderungen oder Wirkungen (im Folgenden "dynamische Änderungsdaten"), wobei die dynamischen Änderungsdaten durch das DCM (4) aus ein oder mehr Quellen der medizinischen Bildgebungsvorrichtung erfasst werden, wobei jede Quelle dazu konfiguriert ist, wenigstens eine dynamische Wirkung zu messen oder zu erkennen, und

- durch ein Bildgebungssteuerungssystem (1) der medizinischen Bildgebungsvorrichtung definierten Bilderfassungsparametern/-befehlen,

c. automatisches Bestimmen in Echtzeit, mithilfe des DCM (4), wenigstens eines neuen Bilderfassungsparameters/ -befehls aus den dynamischen Änderungsdaten und den Bilderfassungsparametern/-befehlen, die in dem Bildgebungssteuerungssystem (1) definiert sind, wobei der neue Bilderfassungsparameter/-befehl einer der Bilderfassungsparameter/-befehle ist, die in dem Bildgebungssteuerungssystem (1) definiert, aber für die dynamische Änderung optimiert sind, während der Bilderfassungsparameter/-befehl, der in dem Bildgebungssteuerungssystem definiert ist und dem neuen Bilderfassungsparameter/-befehl entspricht, frei von jeglicher Anpassung an die dynamischen Änderungsdaten bleibt,

d. automatisches Bereitstellen, mithilfe des DCM, des neuen Bilderfassungsparameters/-befehls an das Hardwaresteuerungssystem.


 
2. Verfahren nach Anspruch 1, wobei die dynamischen Änderungsdaten die Erkennung oder Messung einer dynamischen Wirkung betreffen, die die Qualität des für das Objekt mithilfe der medizinischen Bildgebungsvorrichtung erhaltenen Bildes verschlechtern könnte.
 
3. Verfahren nach Anspruch 1 oder 2, wobei jede dynamischen Änderungsdaten Informationen über eine Bewegung von wenigstens einem Teil des Objekts und/oder eine technische Änderung der medizinischen Bildgebungsvorrichtung oder von Teilen davon und/oder eine Umgebungsveränderung des abzubildenden Volumens oder des abgebildeten Objekts/Subjekts umfassen.
 
4. Verfahren nach Anspruch 1, wobei das DCM (4) dazu konfiguriert ist, dynamische Änderungsdaten von wenigstens zwei Quellen zum Optimieren der Korrektur des bildgebenden Verfahrens für eine einzelne dynamische Wirkung zu kombinieren.
 
5. Verfahren nach einem der Ansprüche 1 bis 4, wobei die Bilderfassungsparameter/-befehle durch ein Bildgebungssteuerungssystem (1) der medizinischen Bildgebungsvorrichtung zum Ausführen des durch die medizinische Bildgebungsvorrichtung projizierten bildgebenden Verfahrens zur Abbildung des Objekts definiert sind.
 
6. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Bilderfassungsparameter/-befehle wenigstens einen Teil des bildgebenden Verfahrens definieren.
 
7. Verfahren nach einem der vorhergehenden Ansprüche, wobei die medizinische Bildgebungsvorrichtung eine Magnetresonanz-Bildgebungsvorrichtung ist und die Bilderfassungsparameter/-befehle Daten/Befehle über einen Gradientenimpuls und/oder einen Hochfrequenzimpuls und/oder eine Hochfrequenz-Datenabtastung sind.
 
8. Dynamisches Korrekturmodul (Dynamic Correction Module, im Folgenden DCM) (4) zur Optimierung in Echtzeit der Bilderfassungsparameter/-befehle eines von einer medizinischen Bildgebungsvorrichtung ausgeführten bildgebenden Verfahrens zur Abbildung eines Objekts, wobei das DCM (4) Folgendes umfasst:

- eine Verbindungseinrichtung zum Verbinden des DCM (4) mit der medizinischen Bildgebungsvorrichtung,

- eine Verarbeitungseinheit zum Verarbeiten der dynamischen Änderungsdaten und Bilderfassungsparameter/-befehle,

- ein computerlesbares Medium, das einen Speicher zum Speichern von computerlesbaren Anweisungen umfasst, die, wenn sie ausgeführt werden, die Verarbeitungseinheit veranlassen, die Schritte (b) bis (d) von einem der Ansprüche 1 bis 7 auszuführen.


 
9. DCM (4) nach Anspruch 8, wobei die computerlesbaren Anweisungen einige Optimierungsverfahren zum Optimieren der Bilderfassungsparameter/-befehle in Abhängigkeit von dynamischen Änderungen umfassen, die während der Abbildung des Objekts mithilfe der medizinischen Bildgebungsvorrichtung in Echtzeit auftreten, wobei jedes Optimierungsverfahren zum Abschwächen einer dynamischen Wirkung konfiguriert ist.
 
10. DCM (4) nach Anspruch 8 oder 9, das dazu konfiguriert ist die aus verschiedenen Quellen der medizinischen Bildgebungsvorrichtung erfassten dynamischen Änderungsdaten zu kombinieren, wobei jede Quelle dazu konfiguriert ist, wenigstens eine dynamische Wirkung zu messen/erkennen, wobei das DCM (4) ferner dazu konfiguriert ist, die dynamischen Änderungsdaten von wenigstens zwei Quellen zum Optimieren der Korrektur des bildgebenden Verfahrens für eine einzelne dynamische Wirkung zu kombinieren.
 
11. Magnetresonanz-Bildgebungsvorrichtung zur Abbildung eines Objekts, wobei die Magnetresonanz-Bildgebungsvorrichtung das DCM (4) nach einem der Ansprüche 8 bis 10 umfasst.
 


Revendications

1. Procédé pour optimiser automatiquement et dynamiquement des paramètres et/ou ordres d'acquisition d'image (ci-après « paramètres/ordres ») d'une procédure d'imagerie effectuée par un appareil d'imagerie médicale afin d'atténuer ou d'annuler des effets dynamiques perturbant le processus d'acquisition d'image d'un objet devant être imagé par ledit appareil d'imagerie médicale, dans lequel les paramètres/ordres d'acquisition d'image sont configurés pour commander un dispositif d'imagerie médicale de l'appareil d'imagerie médicale au moyen d'un système de commande de matériel (2) de l'appareil d'imagerie médicale, le procédé comprenant :

a. connecter un Module de Correction Dynamique (ci-après DCM) (4) à l'appareil d'imagerie médicale ;

b. acquérir automatiquement par le DCM (4)

- des données concernant des changements ou effets dynamiques (ci-après « données de changement dynamique »), dans lequel les données de changement dynamique sont acquises par le DCM (4) à partir d'une ou de plusieurs source(s) de l'appareil d'imagerie médicale, dans lequel chaque source est configurée pour mesurer ou détecter au moins un effet dynamique ; et

- des paramètres/ordres d'acquisition d'image définis par un système de commande d'imagerie (1) de l'appareil d'imagerie médicale ;

c. déterminer automatiquement en temps réel, au moyen du DCM (4), au moins un nouveau paramètre/ordre d'acquisition d'image à partir des données de changement dynamique et des paramètres/ordres d'acquisition d'image définis dans le système de commande d'imagerie (1), le nouveau paramètre/ordre d'acquisition d'image étant l'un desdits paramètres/ordres d'acquisition d'image défini dans le système de commande d'imagerie (1), mais optimisé pour ledit changement dynamique, tandis que le paramètre/ordre d'acquisition d'image défini dans le système de commande d'imagerie et correspondant audit nouveau paramètre/ordre d'acquisition d'image reste exempt de toute adaptation aux données de changement dynamique ;

d. fournir automatiquement, au moyen du DCM, le nouveau paramètre/ordre d'acquisition d'image au système de commande de matériel.


 
2. Procédé selon la revendication 1, dans lequel les données de changement dynamique sont des données relatives à la détection ou à la mesure d'un effet dynamique qui pourrait dégrader la qualité de l'image obtenue pour ledit objet au moyen de l'appareil d'imagerie médicale.
 
3. Procédé selon la revendication 1 ou 2, dans lequel chaque donnée de changement dynamique comprend des informations concernant un mouvement d'au moins une partie dudit objet, et/ou un changement technique de l'appareil d'imagerie médicale ou de parties de celui-ci, et/ou un changement environnemental du volume imagé ou de l'objet/sujet imagé.
 
4. Procédé selon la revendication 1, dans lequel le DCM (4) est configuré pour combiner des données de changement dynamique d'au moins deux sources pour optimiser la correction de la procédure d'imagerie pour un effet dynamique unique.
 
5. Procédé selon l'une des revendications 1 à 4, dans lequel les paramètres/ordres d'acquisition d'image sont définis par un système de commande d'imagerie (1) de l'appareil d'imagerie médicale pour effectuer la procédure d'imagerie projetée par l'appareil d'imagerie médicale pour imager ledit objet.
 
6. Procédé selon l'une des revendications précédentes, dans lequel les paramètres/ordres d'acquisition d'image définissent au moins une partie de la procédure d'imagerie.
 
7. Procédé selon l'une des revendications précédentes, dans lequel l'appareil d'imagerie médicale est un appareil d'Imagerie par Résonance Magnétique et les paramètres/ordres d'acquisition d'image sont des données/ordres concernant une impulsion de gradient, et/ou une impulsion radiofréquence, et/ou un échantillonnage de données radiofréquence.
 
8. Module de Correction Dynamique (ci-après DCM) (4) pour optimiser en temps réel des paramètres/ordres d'acquisition d'image d'une procédure d'imagerie effectuée par un appareil d'imagerie médicale pour imager un objet, le DCM (4) comprenant :

- un moyen de connexion pour connecter le DCM (4) à l'appareil d'imagerie médicale ;

- une unité de traitement pour traiter des données de changement dynamique et des paramètres/ordres d'acquisition d'image ;

- un support lisible par ordinateur comprenant une mémoire pour stocker des instructions exécutables par ordinateur, qui, lorsqu'elles sont exécutées, amènent l'unité de traitement à effectuer les étapes (b) à (d) de l'une des revendications 1 à 7.


 
9. DCM (4) selon la revendication 8, dans lequel les instructions exécutables par ordinateur comprennent plusieurs procédures d'optimisation pour optimiser les paramètres/ordres d'acquisition d'image en fonction de changements dynamiques se produisant en temps réel lors de l'imagerie dudit objet au moyen de l'appareil d'imagerie médicale, dans lequel chaque procédure d'optimisation est configurée pour atténuer un effet dynamique.
 
10. DCM (4) selon la revendication 8 ou 9, configuré pour combiner les données de changement dynamique acquises à partir de différentes sources de l'appareil d'imagerie médicale, dans lequel chaque source est configurée pour mesurer/détecter au moins un effet dynamique, le DCM (4) étant en outre configuré pour combiner les données de changement dynamique d'au moins deux sources pour optimiser la correction de la procédure d'imagerie pour un effet dynamique unique.
 
11. Appareil d'Imagerie par Résonance Magnétique pour l'imagerie d'un objet, ledit appareil d'Imagerie par Résonance Magnétique comprenant le DCM (4) selon l'une des revendications 8 à 10.
 




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Cited references

REFERENCES CITED IN THE DESCRIPTION



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Patent documents cited in the description