High resolution scanned-slit x-ray imaging using a refractive lens for x-ray focusing

被引：3

作者：

Beuville, E ^{[1
]}

Cahn, R ^{[1
]}

Cederstrom, B ^{[1
]}

Danielsson, M ^{[1
]}

Hasegawa, B ^{[1
]}

Lundqvist, M ^{[1
]}

Hall, A ^{[1
]}

Luo, L ^{[1
]}

Nygren, D ^{[1
]}

Oltman, E ^{[1
]}

机构：

[1] Lawrence Berkeley Lab, Berkeley, CA 94707 USA

来源：

PHYSICS OF MEDICAL IMAGING | 1998年 / 3336卷

关键词：

mammography; photon-counting; scanned-slit; x-ray focusing; x-ray lens; ASIC for x-ray imaging;

D O I：

10.1117/12.317007

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

We are developing a slit-scanning digital mammography system with the goal of reducing radiation dose and improving dynamic range in comparison to conventional film-screen mammography. The system is based on a linear silicon detector connected to a fast parallel processing ASIC controlled from a PC. The detector system is configured fi om a silicon wafer such that the X-rays enter the wafer edge-on, resulting in a high efficiency over the entire range of diagnostic X-ray energies since the absorption length of the detector can be made large. An evaluation of the system gives an MTF close to that predicted theoretically for a 100-mu m-pitch pixel detector. We also propose to reduce tube-loading in the slit-scanning system with a refractive X-ray lens that can increase the incident photon flux by about 5-fold according to ray tracing simulations. Moreover the lens shapes the energy spectrum to obtain a pseudo-monochromatic beam thus enhancing contrast sensitivity, for example in mammography. We estimate a scan time with the final system of the order of a few seconds for a full-field digital mammogram. Phantom images of microcalcifications and of tumor-like masses, and an initial evaluation of a scanned-slit photon-counting X-ray imaging system, are presented.

引用

页码：95 / 103

页数：9