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2 May 1997 Prototype CCD-based detector for whole-breast digital mammography
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We describe a prototype multi-mode CCD-based detector for digital mammography. Each module incorporates a CCD bonded to a demagnifying fiberoptic taper. The x-ray-to-light converter is formed by depositing Gd2O2S:Eu onto the large end of the taper. The modules are held together in an array in order to cover a large area. We have constructed a 2-module prototype to evaluate the performance of this design and to develop software and hardware methods for the final multi-module detector. The 2-module detector forms an imaging area of 10 X 20 cm. with a 30-50 micrometers gap between the modules. Each module incorporates a 3.5:1 demagnifying fiberoptic taper and a 2048 X 2048, 14 micrometers -pixel CCD, resulting in an effective pixel size of 50 micrometers . For each 20keV x-ray photon incident on the phosphor converter approximately 7 electrons are generated in the CCD. For a 1 second exposure, the image noise is approximately 15 e/pixel and the dynamic range of the detector is approximately 20,000. The detector MTF is comparable to hat of a MinR screen/film system and the detector is able to resolve all features except the smallest spec group in an ACR phantom.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel Rosen, Walter Charles Phillips, Martin J. Stanton, Juanhui Xie, Daniel M. O'Mara, and Alexander X. Stewart "Prototype CCD-based detector for whole-breast digital mammography", Proc. SPIE 3032, Medical Imaging 1997: Physics of Medical Imaging, (2 May 1997);


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