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24 July 1998 High-resolution scanned-slit x-ray imaging using a refractive lens for x-ray focusing
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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