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Proceedings Paper

Performance analysis of several generations of flat-panel x-ray imagers based on polycrystalline silicon TFTs
Author(s): Larry E. Antonuk; Youcef El-Mohri; Qihua Zhao; Martin Koniczek; Albert Liang; Hao Jiang; John McDonald; Robert A. Street; Jeng-Ping Lu
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Paper Abstract

Active matrix flat-panel imagers (AMFPIs) have become ubiquitous in medical imaging environments. AMFPIs are based on two-dimensional pixelated arrays coupled to various x-ray converter materials that provide either indirect or direct detection of the incident x-ray radiation. However, the capabilities of this technology are severely constrained by the underlying solid-state properties of the amorphous silicon semiconductor material employed in the thin-film transistors present in each array pixel. The considerably higher electron and hole mobilities of polycrystalline silicon, a semiconductor material that (like amorphous silicon) is well suited to fabrication of transistors for large area electronics, provide the potential to overcome these constraints by increasing the overall gain of the system relative to the electronic additive noise. To explore this potential, a series of prototype arrays based on increasingly complex pixel designs employing polycrystalline silicon transistors is under development by our collaboration. The designs include several generations of active pixel arrays that incorporate sophisticated pixel-level amplifier circuits with the goal of improving imaging performance. In this paper, an initial analysis of the noise and DQE performance of selected prototype pixel circuit designs will be presented. The results are based on a combination of Monte Carlo -based circuit simulations and cascaded systems analysis, supplemented with information obtained from measurements performed on poly-Si transistors. The paper concludes with a brief discussion of the potential for, and challenges associated with, the creation of single photon counting arrays based on poly-Si TFTs.

Paper Details

Date Published: 19 March 2013
PDF: 9 pages
Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 86680A (19 March 2013); doi: 10.1117/12.2008324
Show Author Affiliations
Larry E. Antonuk, Univ. of Michigan (United States)
Youcef El-Mohri, Univ. of Michigan (United States)
Qihua Zhao, Univ. of Michigan (United States)
Martin Koniczek, Univ. of Michigan (United States)
Albert Liang, Univ. of Michigan (United States)
Hao Jiang, Univ. of Michigan (United States)
John McDonald, Univ. of Michigan (United States)
Robert A. Street, Palo Alto Research Ctr. (United States)
Jeng-Ping Lu, Palo Alto Research Ctr. (United States)

Published in SPIE Proceedings Vol. 8668:
Medical Imaging 2013: Physics of Medical Imaging
Robert M. Nishikawa; Bruce R. Whiting; Christoph Hoeschen, Editor(s)

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