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Proceedings Paper

Imaging technique optimization of tungsten anode FFDM system
Author(s): Biao Chen; Andrew P. Smith; Zhenxue Jing; Elena Ingal
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Paper Abstract

Single Mo target, Mo / Rh, or Mo / W bi-track targets with corresponding Mo and Rh filters have provided optimal target / filter combinations for traditional screen / film systems. In the advent of full-field digital mammography, similar target / filter combinations were adopted directly for digital imaging systems with direct and indirect conversion based detectors. To reduce the average glandular dose while maintaining the clinical image quality of FFDMs, alternative target / filter combinations have been investigated extensively to take advantages of the digital detectors with high dynamic range, high detection dose efficiency, and low noise level. This paper reports the development of a digital FFDM system that is equipped with single tungsten target and rhodium and silver filters. A mathematical model was constructed to quantitatively simulate x-ray spectra, breast compositions, contrast objects, x-ray scatter distribution, grid performance, and characteristics of a-Se flat panel detector. Computer simulations were performed to select kV/filter for different breast thickness and breast compositions through maximizing the contrast object detection dose efficiency. A set of phantom experiments were employed to optimize the x-ray techniques within the constraints of exposure time and required dose levels. A 50-micrometer rhodium filter was applied for thin and average breasts and a 50-micrometer silver filter for thicker breasts. To meet our design requirements and EUREF protocol specifications, we finely adjusted x-ray techniques for 0.45, 0.75, 1.0, 1.35 mGy dose modes with regards to ACR phantom scoring and PMMA phantom SNR/CNR performance, respectively. The optimal x-ray techniques significantly reduce average glandular dose while maintaining imaging performance.

Paper Details

Date Published: 13 March 2009
PDF: 9 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725830 (13 March 2009); doi: 10.1117/12.811745
Show Author Affiliations
Biao Chen, Hologic, Inc. (United States)
Andrew P. Smith, Hologic, Inc. (United States)
Zhenxue Jing, Hologic, Inc. (United States)
Elena Ingal, Hologic, Inc. (United States)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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