Radiographic technique factors and imaging performance in digital mammography

Walter Huda; Guoying Qu; Zhenxue Jing; Barbara G. Steinbach; Janice C. Honeyman-Buck

doi:10.1117/12.384532

25 April 2000 Radiographic technique factors and imaging performance in digital mammography

Walter Huda, Guoying Qu, Zhenxue Jing, Barbara G. Steinbach, Janice C. Honeyman-Buck

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384532
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

Simulated mass lesions were superimposed onto an anthropomorphic breast phantom and x-rayed using a small field of view digital mammography system. Digital radiographs were acquired at a range of x-ray tube potential (constant detector exposure), and a range of x-ray tube current-time product values (constant x-ray tube potential). Twelve readers assessed the probability of a simulated mass being present in specified regions of interest, with the resultant data used to determine the area under the receiver operating characteristic curve (A_z). The mean A_z value obtained at 28 kVp/72 mAs was 0.69. At the same x-ray tube potential, the A_z score fell to 0.63 (p less than 0.05) at 32 mAs, whereas the mean A_z score of 0.71 was not significantly different for the image acquired at 144 mAs. At a constant detector exposure, reducing the x-ray tube potential to 22 kVp (320 mAs) resulted in a mean A_z value of 0.72, whereas increasing the x-ray tube potential to 34 kVp (28 mAs) resulted in a mean A_z value of 0.69. For the detection of simulated mass lesions in an anthropomorphic breast phantom, changing the kVP at a constant detector exposure had no significant effect on imaging performance, whereas halving the mAs at a constant kVp reduced the A_z value by approximately 10%.

Citation Download Citation

Walter Huda, Guoying Qu, Zhenxue Jing, Barbara G. Steinbach, and Janice C. Honeyman-Buck "Radiographic technique factors and imaging performance in digital mammography", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384532

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