High-resolution direct-detection x-ray imagers

Robert A. Street; Steve E. Ready; Jeffrey T. Rahn; Marcelo Mulato; Kanai S. Shah; Paul R. Bennett; Ping Mei; Jeng-Ping Lu; Raj B. Apte; Jackson Ho; Koenraad Van Schuylenbergh; Francesco Lemmi; James B. Boyce; Per Nylen; Michael M. Schieber; Haim Hermon

doi:10.1117/12.384516

25 April 2000 High-resolution direct-detection x-ray imagers

Robert A. Street, Steve E. Ready, Jeffrey T. Rahn, Marcelo Mulato, Kanai S. Shah, Paul R. Bennett, Ping Mei, Jeng-Ping Lu, Raj B. Apte, Jackson Ho, Koenraad Van Schuylenbergh, Francesco Lemmi, James B. Boyce, Per Nylen, Michael M. Schieber, Haim Hermon

Author Affiliations +

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384516
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

We report on a-Si direct detection x-ray image sensors with polycrystalline PbI₂, and more recently with HgI₂. The arrays have 100 micron pixel size and, we study those aspects of the detectors that mainly determine the DQE, such as sensitivity, effective fill factor, dark current noise, noise power spectrum, and x-ray absorption. Line spread function data show that in the PbI₂ arrays, most of the signal in the gap between pixels is collected, which is important for high,DQE. The leakage current noise agrees with the expected shot noise value with only a small enhancement at high bias voltages. The noise power spectrum under x-ray exposure is reported and compared to the spatial resolution information. The MTF is close to the ideal sinc function, but is reduced by the contribution of K-fluorescence in the PbI₂ film for which we provide new experimental evidence. The role of noise power aliasing in the DQE and the effect of slight image spreading are discussed. Initial studies of HgI₂ as the photoconductor material show very promising results with high x-ray sensitivity and low leakage current.

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Robert A. Street, Steve E. Ready, Jeffrey T. Rahn, Marcelo Mulato, Kanai S. Shah, Paul R. Bennett, Ping Mei, Jeng-Ping Lu, Raj B. Apte, Jackson Ho, Koenraad Van Schuylenbergh, Francesco Lemmi, James B. Boyce, Per Nylen, Michael M. Schieber, and Haim Hermon "High-resolution direct-detection x-ray imagers", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384516

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