An apparatus for assisting determination of detective...

A - Human Necessities – 61 – B

Patent

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Details

A61B 6/00 (2006.01) A61B 6/10 (2006.01) G01T 1/02 (2006.01) G01T 1/161 (2006.01)

Patent

CA 2678065

An apparatus for determining MTF and DQE of an ionizing radiation imaging system/detector is provided, comprising a box having aligned windows transparent to an ionizing radiation beam. When the box is placed in front of the detector, the beam passes through the box. The apparatus further comprises: a KERMA module for measuring incident free-air KERMA; a backscatter baffle for preventing backscatter of the beam from the detector into the KERMA module; a scatter baffle for preventing scatter of the beam into the KERMA module, and to reduce backscatter from the backscatter baffle; at least one MTF module for enabling acquisition of at least one edge image. Each module and the at least one backscatter baffle are independently moveable in and out of the beam, such that open, dark and edge images may be independently acquired, and KERMA module measurements may be performed independent of image acquisition, to determine DQE.

L'invention porte sur un appareil déterminant le MTF et le DQE du rayonnement ionisant d'un système/détecteur d'imagerie, comprenant une boîte présentant des fenêtres alignées transparentes pour le rayonnement ionisant. Quand la boîte est placée devant le détecteur, le rayonnement la traverse. L'appareil comprend de plus: un module KERMA pour mesurer le KERMA incident dans l'air libre; un écran empêchant la rétrodiffusion du faisceau du détecteur dans le module KERMA et réduire la rétrodiffusion dudit écran; et au moins un module MTF permettant l'acquisition d'au moins une image de bord. Chaque module et au moins l'un des écran anti-rétrodiffusion peut être indépendamment placé sur ou hord de la trajectoire du faisceau, ce qui permet d'acquérir independamment des images ouvertes, sombres ou de bord, et les mesures du module KERMA peuvent se faire indépendamment de l'acquisition d'images pour déterminer le DQE.

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