The title:
High Resolution Active Pixel Sensor X-Ray Detectors for Digital Breast Tomosynthesis
by
Chumin Zhao
2017

and the link to the

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The dissertation in the University of Michigan written in 2017 gives a detailed overview about the different existing and new technologies.
Abstract:
Current large area x-ray detectors for digital breast tomosynthesis (DBT) are based on the
amorphous silicon (a-Si:H) passive pixel sensor (PPS) technology. However, PPS
detectors suffer from a limited resolution and high electronic noise. In this dissertation,
we propose high resolution large area active pixel sensor (APS) x-ray detectors based on
the complementary metal-oxide-semiconductor (CMOS) and amorphous In-Sn-Zn-O
(a-ITZO) thin-film transistor (TFT) technologies to improve the imager resolution and
noise properties.
© Chumin Zhao 2017

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Best Regards
Klaus