Direct conversion detector for digital mammography

被引：29

作者：

Polischuk, B ^{[1
]}

Rougeot, H ^{[1
]}

Wong, K ^{[1
]}

Debrie, A ^{[1
]}

Poliquin, E ^{[1
]}

Hansroul, M ^{[1
]}

Martin, JP ^{[1
]}

Truong, TT ^{[1
]}

Choquette, M ^{[1
]}

Laperrière, L ^{[1
]}

Shukri, Z ^{[1
]}

机构：

[1] Noranda Adv Mat, St Laurent, PQ H4R 2P1, Canada

来源：

MEDICAL IMAGING 1999: PHYSICS OF MEDICAL IMAGING, PTS 1 AND 2 | 1999年 / 3659卷

关键词：

selenium; direct converter detector; TFT; flat-panel; digital mammography;

D O I：

10.1117/12.349518

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

In this paper, we report measurements from a prototype 1024x1024 selenium-based flat panel detector suited for interventional digital mammography applications. This detector is based on an amorphous silicon TFT array, with a pixel pitch of 85 mu m and a fill factor of 70%. A 200 mu m layer of amorphous selenium is used to directly convert the incident x-rays into electrical charges. The detector electronics, TFT array, and selenium converter structure are designed to operate at a frame rate of 10 images per second. Experimentally, this detector yields an x-ray sensitivity of nearly 290 electrons/absorbed x-ray, nearly 100% absorption of x-rays at a beam energy of 18keV, a high spatial resolution (limited only by the pixel pitch up to the Nyquist limit), and quantum-noise limited operation down to the lowest exposures currently investigated. Images from the ACR phantom and contrast detail phantom reveal all embedded targets in the phantoms, which indicates the potential of this technology for digital mammography.

引用

页码：417 / 425

页数：9

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