TU-E-217BCD-05: Dedicated Breast CT: Skin Thickness Measurements in a Diagnostic Population

Medical Physics
Srinivasan VedanthamAvice M O'Connell

Abstract

To test the hypothesis that the mean skin thickness determined using cone-beam dedicated breast CT varied between breasts with malignant, hyperplasia and benign pathology, and to determine the appropriate skin thickness for Monte Carlo based estimation of normalized glandular dose coefficients. Breast skin thickness was estimated in 137 women scheduled for biopsy (BI-RADS 4 or 5), who underwent unilateral cone-beam dedicated CT of the breast to be biopsied, after providing written informed consent and in adherence to an IRB-approved protocol. Pathology results were available for 132 women and there were 38 malignancies. A previously reported method [Huang et al., Med Phys 35(4): 1199-206, 2008] was applied to coronal (transverse) images reconstructed to 0.273 mm voxel size. The accuracy of the method was determined by imaging two phantoms of differing wall thickness and shape. For each breast, the mean, intra-breast standard deviation (SD) and the median skin thickness were computed. The mean skin thickness and associated confidence intervals (CI) in our study population were obtained from the mean skin thickness of each breast. The estimated mean wall thicknesses for both phantoms were within +/-1% of the measured thickness. A...Continue Reading

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