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1. WO2007031898 - DIRECT MEASURING AND CORRECTION OF SCATTER FOR CT

Publication Number WO/2007/031898
Publication Date 22.03.2007
International Application No. PCT/IB2006/053054
International Filing Date 01.09.2006
IPC
A61B 6/00 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
6Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
CPC
A61B 6/027
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
6Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
02Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
027characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
A61B 6/032
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
6Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
02Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
03Computerised tomographs
032Transmission computed tomography [CT]
A61B 6/4028
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
6Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
40with arrangements for generating radiation specially adapted for radiation diagnosis
4021involving movement of the focal spot
4028resulting in acquisition of views from substantially different positions, e.g. EBCT
A61B 6/4291
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
6Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
42with arrangements for detecting radiation specially adapted for radiation diagnosis
4291the detector being combined with a grid or grating
A61B 6/5282
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
6Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
52Devices using data or image processing specially adapted for radiation diagnosis
5258involving detection or reduction of artifacts or noise
5282due to scatter
Applicants
  • PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH [DE]/[DE] (DE)
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL]/[NL] (AE, AG, AL, AM, AT, AU, AZ, BA, BB, BE, BF, BG, BJ, BR, BW, BY, BZ, CA, CF, CG, CH, CI, CM, CN, CO, CR, CU, CY, CZ, DK, DM, DZ, EC, EE, EG, ES, FI, FR, GA, GB, GD, GE, GH, GM, GN, GQ, GR, GW, HN, HR, HU, ID, IE, IL, IN, IS, IT, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MC, MD, MG, MK, ML, MN, MR, MW, MX, MY, MZ, NA, NE, NG, NI, NL, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SI, SK, SL, SM, SN, SV, SY, SZ, TD, TG, TJ, TM, TN, TR, TT, TZ, UA, UG, UZ, VC, VN, ZA, ZM, ZW)
  • PROKSA, Roland [DE]/[DE] (UsOnly)
Inventors
  • PROKSA, Roland
Agents
  • VOLMER, Georg
Priority Data
05108406.913.09.2005EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DIRECT MEASURING AND CORRECTION OF SCATTER FOR CT
(FR) MESURE ET CORRECTION DIRECTES DE DISPERSION POUR TOMOGRAPHIE PAR ORDINATEUR
Abstract
(EN)
Cone-beam CT scanners with large detector arrays suffer from increased scatter radiation. This radiation may cause severe image artefacts. An examination apparatus is provided which directly measures the scatter radiation and uses this measurement for a correction of the contaminated image data. The measurement is performed by utilizing a 1- dimensional anti-scatter-grid and an X-ray tube with an electronic focal spot movement. Image data is detected at a first position of a focal spot and scatter data is detected at a second position of the focal spot. The image data is corrected on the basis of the scatter data.
(FR)
Les scanners de tomographie par ordinateur (CT) à faisceau conique présentant des groupes élevés de détecteur sont soumis à une dispersion de rayonnement accrue. Ce rayonnement peut provoquer des artéfacts graves dans l'image. Selon un mode de réalisation de l'invention, un dispositif d'examen mesure directement le rayonnement dispersé et utilise cette mesure pour corriger les données d'image contaminées. Cette mesure peut être exécutée au moyen d'un réseau antidispersion unidimensionnel et d'un tube à rayons X pourvu d'un déplacement électronique de point focal.
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