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Two active pixel sensor (APS) architectures have been evaluated for mammography. Firstly, a 525 times 525 APS array of 25 times 25 mum pixels with greater than 80% fill factor, on-pixel analogue buffer amplifier and column parallel 10-bit ADC has been optically coupled to a 115 mum thick CsI:Tl phosphor with columnar structure. Critical performance parameters such as photon transfer curves, MTF, and...
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