Accurate estimation of compressed breast thickness in mammography
Accurate estimation of compressed breast thickness in mammography
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DOI：
10.1118/1.3065068
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发表时间：
2009-02-01
期刊：
影响因子：
3.8
通讯作者：
Yaffe, Martin J.
中科院分区：
文献类型：
--
作者：
Mawdsley, Gordon E.;Tyson, Albert H.;Yaffe, Martin J.
根据乳房X光照片确定乳腺体积密度(VBD)需要准确了解受压乳房的厚度。在此之前，作者描述了一种使用光学立体摄影测量来测量局部厚度的技术[A.H.泰森、G.E.Mawdsley和M.J.Yaffe，Med.太棒了。36(2)、569-576(2009)]。在这里，作者描述了该工具的使用，以指导开发一种更简单、更实用的现场技术来估计乳房厚度并测试其准确性。体模的形状和压缩特性与不同大小的乳房相似。这些模体在几种不同类型的乳房X光摄影单元上以不同的力被压缩，并在与压缩板接触的多个点上使用光学立体摄影测量法测量其受压厚度。建立了一个预测方程，它使用由乳房X光摄影系统提供的压缩厚度和压缩力的读数来估计局部乳房厚度。使用这种方法，与仅使用乳房X光机的厚度读数相关的高达15 mm的误差相比，使用简单的测试对象可以将系统校准到优于5 mm的厚度精度。在测试的系统上，使用该方法获得的VBD的估计值与使用乳腺X光机报告的恒定厚度测定的VBD的估计值相比显著降低。
The determination of volumetric breast density (VBD) from mammograms requires an accurate knowledge of the thickness of the compressed breast. Previously, the authors described a technique for measuring local thicknesses using optical stereoscopic photogrammetry [A. H. Tyson, G. E. Mawdsley, and M. J. Yaffe, "Measurement of compressed breast thickness by optical stereoscopic photogrammetry," Med. Phys. 36(2), 569-576 (2009)]. Here, the authors describe the use of this tool to guide the development of a simpler, more practical field technique for the estimation of breast thickness and test its accuracy. Phantoms were constructed having similar shapes and compression characteristics to breasts of different sizes. These phantoms were compressed at different forces on several types of mammography units and their thickness under compression was measured using optical stereoscopic photogrammetry at many points of contact with the compression plate. A prediction equation was developed that uses the readout of compressed thickness and compression force provided by the mammography system to estimate local breast thickness. Using this approach, systems can be calibrated to an accuracy of better than 5 mm in thickness using a simple test object compared to an error of up to 15 mm associated with using only the thickness readout of the mammography machine. On the systems tested, the estimated value of VBD obtained using this method is significantly reduced from that determined using the constant thickness reported by the mammography machine.