(19)
(11)EP 1 372 114 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
05.01.2011 Bulletin 2011/01

(43)Date of publication A2:
17.12.2003 Bulletin 2003/51

(21)Application number: 03253181.6

(22)Date of filing:  21.05.2003
(51)Int. Cl.: 
G06T 11/00  (2006.01)
(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30)Priority: 22.05.2002 JP 2002147231
06.11.2002 JP 2002322756

(71)Applicant: GE Medical Systems Global Technology Company LLC
Waukesha, Wisconsin 53188-1696 (US)

(72)Inventor:
  • Hagiware, Akira
    Hino-shi, Tokyo 191-8503 (JP)

(74)Representative: Goode, Ian Roy 
London Patent Operation General Electric International, Inc. 15 John Adam Street
London WC2N 6LU
London WC2N 6LU (GB)

  


(54)X-ray ct apparatus and method using three dimensional back projection


(57) In order to reduce the amount of computation in the cone beam reconstruction, the invention provides, from within raw data acquired (S1,S2,S3) using a multidetector, extracting raw data Dr corresponding to plural lines on reconstruction field (S4), generating projection line data (S5) by multiplying raw data with cone beam reconstruction weight, filtering projection line data to generate image positional line data Df (S6), determining back projection pixel data (S7, S8, S9) of each pixel on the reconstruction field based on the image positional line data, adding, for each pixel, back projection pixel data of all views used for the image reconstruction to determine back projection data (S10, S11). The number of lines may be variable in compliance with a desired image quality.