Blough M M, Waggener R G, Payne W H, Terry J A
University of Texas Health Science Center, San Antonio 78284-7800, USA.
Med Phys. 1998 Sep;25(9):1605-12. doi: 10.1118/1.598340.
A model for calculating mammographic spectra independent of measured data and fitting parameters is presented. This model is based on first principles. Spectra were calculated using various target and filter combinations such as molybdenum/molybdenum, molybdenum/rhodium, rhodium/rhodium, and tungsten/aluminum. Once the spectra were calculated, attenuation curves were calculated and compared to measured attenuation curves. The attenuation curves were calculated and measured using aluminum alloy 1100 or high purity aluminum filtration. Percent differences were computed between the measured and calculated attenuation curves resulting in an average of 5.21% difference for tungsten/aluminum, 2.26% for molybdenum/molybdenum, 3.35% for rhodium/rhodium, and 3.18% for molybdenum/rhodium. Calculated spectra were also compared to measured spectra from the Food and Drug Administration [Fewell and Shuping, Handbook of Mammographic X-ray Spectra (U.S. Government Printing Office, Washington, D.C., 1979)] and a comparison will also be presented.
本文提出了一种独立于测量数据和拟合参数来计算乳腺X线摄影光谱的模型。该模型基于第一性原理。使用各种靶材和滤过组合（如钼/钼、钼/铑、铑/铑和钨/铝）来计算光谱。一旦计算出光谱，就计算衰减曲线并与测量的衰减曲线进行比较。使用1100铝合金或高纯度铝滤过来计算和测量衰减曲线。计算测量的和计算的衰减曲线之间的百分比差异，结果是钨/铝的平均差异为5.21%，钼/钼为2.26%，铑/铑为3.35%，钼/铑为3.18%。还将计算的光谱与美国食品药品监督管理局的测量光谱进行比较[Fewell和Shuping，《乳腺X线摄影X射线光谱手册》（美国政府印刷局，华盛顿特区，1979年）]，并给出比较结果。
