EP 0984717 A1 20000315 - NON-INVASIVE DIAGNOSTIC METHOD AND APPARATUS
Title (en)
NON-INVASIVE DIAGNOSTIC METHOD AND APPARATUS
Title (de)
VERFAHREN UND VORRICHTUNG ZUR NICHT-INVASIVEN DIAGNOSTIK
Title (fr)
METHODE ET APPAREIL DE DIAGNOSTIC NON EFFRACTIF
Publication
Application
Priority
- GB 9801524 W 19980526
- GB 9710561 A 19970523
Abstract (en)
[origin: WO9852460A1] Two light sources (2, 3; 20, 22) of wavelenghts within the region 1.1 to 1.6 mu m, modulated at the same frequency but in antiphase to each other, are transmitted through a tooth (6; 24). Transmitted light is measured by a detector (9; 26) provided with an electronic filter set (28) to pass only the modulated frequency signal corresponding to differences in absorption between the two wavelenghts. The differential absorption detection serves as a basis for caries detection. Scatter of the light in tissue is offset by the use of optical spatial filtering.
IPC 1-7
IPC 8 full level
A61B 5/00 (2006.01); A61C 19/04 (2006.01)
CPC (source: EP)
A61B 5/0088 (2013.01); A61B 2562/0238 (2013.01); A61C 19/04 (2013.01)
Citation (search report)
See references of WO 9852460A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 9852460 A1 19981126; AU 7543398 A 19981211; EP 0984717 A1 20000315; GB 9710561 D0 19970716
DOCDB simple family (application)
GB 9801524 W 19980526; AU 7543398 A 19980526; EP 98922975 A 19980526; GB 9710561 A 19970523