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1. WO2020142396 - METHODS FOR CALIBRATING A SPECTRAL X-RAY IMAGING SYSTEM TO PERFORM MATERIAL DECOMPOSITION

Publication Number WO/2020/142396
Publication Date 09.07.2020
International Application No. PCT/US2019/068853
International Filing Date 28.12.2019
IPC
G01T 1/169 2006.01
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
16Measuring radiation intensity
169Exploration, location of contaminated surface areas
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 6/03
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
A61B 6/4241
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
4208characterised by using a particular type of detector
4241using energy resolving detectors, e.g. photon counting
A61B 6/482
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
6Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
48Diagnostic techniques
482involving multiple energy imaging
A61B 6/5205
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
5205involving processing of raw data to produce diagnostic data
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
A61B 6/582
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
6Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
58Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
582Calibration
Applicants
  • CARESTREAM DENTAL LLC [US]/[US]
Inventors
  • SCHILDKRAUT, Jay, S.
  • INGLESE, Jean-Marc
  • SUBRAMANYAN, Krishnamoorthy
  • LOUSTAUNEAU, Vincent
Agents
  • COURSEY, R., Stevan
Priority Data
62/786,47630.12.2018US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHODS FOR CALIBRATING A SPECTRAL X-RAY IMAGING SYSTEM TO PERFORM MATERIAL DECOMPOSITION
(FR) PROCÉDÉS D'ÉTALONNAGE D'UN SYSTÈME D'IMAGERIE SPECTRALE PAR RAYONS X POUR EFFECTUER UNE DÉCOMPOSITION DE MATÉRIAU
Abstract
(EN)
The present disclosure describes methods for calibrating a spectral X-ray system to perform material decomposition with a single scan of an energy discriminating detector or with a single scan at each used X-ray spectrum. The methods may include material pathlengths exceeding the size of the volume reconstructable by the system. Example embodiments include physical and matching calibration phantoms. The physical calibration phantom is used to measure the attenuation of X-rays passing therethrough with all combinations of pathlengths through the calibration's basis materials. The matching digital calibration phantom is registered with the physical calibration phantom and is used to calculate the pathlength though each material for each measured attenuation value. A created data structure includes the X-ray attenuation for each X-ray spectrum or detector energy bin for all combinations of basis material pathlengths. The data structure is usable to perform a material decomposition on the X-ray projection of an imaged object.
(FR)
La présente invention concerne des procédés d'étalonnage d'un système de rayons X spectral pour effectuer une décomposition de matériau avec un balayage unique d'un détecteur de discrimination d'énergie ou avec un balayage unique à chaque spectre de rayons X utilisé. Les procédés peuvent comprendre des longueurs de trajet de matériau dépassant la taille du volume reconstructible par le système. Des exemples de modes de réalisation comprennent des fantômes physiques d'étalonnage et correspondants. Le fantôme physique d'étalonnage est utilisé pour mesurer l'atténuation des rayons X passant à travers celui-ci avec toutes les combinaisons de longueurs de trajet à travers les matériaux de base de l'étalonnage. Le fantôme numérique d'étalonnage correspondant est enregistré avec le fantôme physique d'étalonnage et est utilisé pour calculer la longueur de trajet à travers chaque matériau pour chaque valeur d'atténuation mesurée. Une structure de données créée comprend l'atténuation de rayons X pour chaque spectre de rayons X ou compartiment d'énergie de détecteur pour toutes les combinaisons de longueurs de trajet de matériau de base. La structure de données peut être utilisée pour effectuer une décomposition de matériau sur la projection de rayons X d'un objet imagé.
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