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Proceedings Paper

A stationary digital breast tomosynthesis scanner
Author(s): Xin Qian; Andrew Tucker; Emily Gidcumb; Jianping Lu; Otto Zhou; Derrek Spronk; Frank Sprenger; Yiheng Zhang; Don Kennedy; Tom Farbizio; Zhenxue Jing
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Paper Abstract

A prototype stationary digital breast tomosynthesis (s-DBT) system has been developed by retrofitting a Hologic Selenia Dimension rotating gantry tomosynthesis scanner with a spatially distributed carbon nanotube (CNT) x-ray source array. The goal is to improve the system spatial resolution by removing the x-ray tube motion induced focal spot blurring. The CNT x-ray source array comprises 31 individually addressable x-ray beams covering 30° angular span. Each x-ray beam has a minimum focal spot size of 0.64×0.61mm (full-width-at-half-maximum), a stationary W anode operating up to 50kVp, and 1mm thick Al filter. The flux from each beam is regulated and varied using dedicated control electronics. The maximum tube current is determined by the heat load of the stationary anode and depends on the energy, pulse width and the focal spot size used. Stable operation at 28kVp, 27mA tube current, 250msec pulse width and 38mA tube current, 183msec pulse width per exposure was achieved with extended lifetime. The standard ACR phantom was imaged and analyzed to evaluate the image quality. The actual scanning speed depends on the number of views and the readout time of the x-ray detector. With the present detector, 6 second scanning time at either 15 views or 31 views can be achieved at 100mAs total imaging dose with a detector readout time of 240msec.

Paper Details

Date Published: 9 March 2012
PDF: 11 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 831352 (9 March 2012); doi: 10.1117/12.911540
Show Author Affiliations
Xin Qian, The Univ. of North Carolina at Chapel Hill (United States)
Andrew Tucker, The Univ. of North Carolina at Chapel Hill (United States)
Emily Gidcumb, The Univ. of North Carolina at Chapel Hill (United States)
Jianping Lu, The Univ. of North Carolina at Chapel Hill (United States)
Otto Zhou, The Univ. of North Carolina at Chapel Hill (United States)
Derrek Spronk, XinRay Systems, Inc. (United States)
Frank Sprenger, XinRay Systems, Inc. (United States)
Yiheng Zhang, Hologic, Inc. (United States)
Don Kennedy, Hologic, Inc. (United States)
Tom Farbizio, Hologic, Inc. (United States)
Zhenxue Jing, Hologic, Inc. (United States)

Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)

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