Chapter 7

Photon-Counting Detectors and Clinical Applications in Medical CT Imaging

Ira Blevis and Reuven Levinson

7.1 Photon-Counting Detectors for Medical Imaging

7.1.1 Direct Conversion

Direct conversion radiation detectors offer new capabilities for medical CT imaging over indirect conversion detectors currently in use. The capabilities include energy resolution, variable energy weighting, noise reduction to the quantum statistical limit, as well as increased spatial resolution. These advantages in turn enable new applications such as material decomposition as well as improved image quality in low-dose screening applications and high-spatial-resolution imaging. The advantages stem from basic physics limits on the fidelity and entropy of ...

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