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

Eric J. Beuville; Robert N. Cahn; Bjoern Cederstroem; Mats Danielsson; Bruce H. Hasegawa; Mats Lundqvist; Anna Hall; Lei Luo; David Robert Nygren; Ed Oltman

doi:10.1117/12.317007

24 July 1998 High-resolution scanned-slit x-ray imaging using a refractive lens for x-ray focusing

Eric J. Beuville, Robert N. Cahn, Bjoern Cederstroem, Mats Danielsson, Bruce H. Hasegawa, Mats Lundqvist, Anna Hall, Lei Luo, David Robert Nygren, Ed Oltman

Author Affiliations +

Proceedings Volume 3336, Medical Imaging 1998: Physics of Medical Imaging; (1998) https://doi.org/10.1117/12.317007
Event: Medical Imaging '98, 1998, San Diego, CA, United States

Abstract

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 from 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-micrometer 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 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.

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Eric J. Beuville, Robert N. Cahn, Bjoern Cederstroem, Mats Danielsson, Bruce H. Hasegawa, Mats Lundqvist, Anna Hall, Lei Luo, David Robert Nygren, and Ed Oltman "High-resolution scanned-slit x-ray imaging using a refractive lens for x-ray focusing", Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); https://doi.org/10.1117/12.317007

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