Hunt R A, Dance D R, Pachoud M, Alm Carlsson G, Sandborg M, Ullman G, Verdun F R
Department of Physics, The Royal Marsden Hospital NHS Foundation Trust, London SW3 6JJ, UK.
Radiat Prot Dosimetry. 2005;114(1-3):432-5. doi: 10.1093/rpd/nch511.
A test phantom, including a wide range of mammographic tissue equivalent materials and test details, was imaged on a digital mammographic system. In order to quantify the effect of scatter on the contrast obtained for the test details, calculations of the scatter-to-primary ratio (S/P) have been made using a Monte Carlo simulation of the digital mammographic imaging chain, grid and test phantom. The results show that the S/P values corresponding to the imaging conditions used were in the range 0.084-0.126. Calculated and measured pixel values in different regions of the image were compared as a validation of the model and showed excellent agreement. The results indicate the potential of Monte Carlo methods in the image quality-patient dose process optimisation, especially in the assessment of imaging conditions not available on standard mammographic units.
一个包含多种乳腺X线摄影组织等效材料和测试细节的测试体模，在数字乳腺X线摄影系统上进行了成像。为了量化散射对测试细节所获得对比度的影响，已使用数字乳腺X线摄影成像链、滤线栅和测试体模的蒙特卡罗模拟来计算散射与原发射线比值（S/P）。结果表明，对应于所使用成像条件的S/P值在0.084 - 0.126范围内。对图像不同区域计算得到的像素值和测量得到的像素值进行了比较，以验证模型，结果显示二者具有极佳的一致性。结果表明蒙特卡罗方法在图像质量 - 患者剂量过程优化方面具有潜力，特别是在评估标准乳腺X线摄影设备上无法实现的成像条件时。
