基于蒙特卡罗和CT数据体素模型的双能Ｘ射线吸收法腰椎骨密度成像参数优化

本文研究了双能X射线吸收法（DXA）成像过程并优化成像参数，为提高双能X射线骨密度仪的成像质量提供理论依据。采用蒙特卡洛方法，并构建基于患者计算机断层扫描影像数据（CT）的体素模型，利用模拟产生的高低能X射线能谱，分别照射体素模型腰椎部位得到骨密度图像。计算每幅图像的品质因数（FOM），FOM基于由探测器记...This study investigates the imaging process of dual-energy X-ray absorptiometry (DXA) and optimizes the imaging parameters, aiming to provide a theoretical basis for improving the imaging quality of dual-energy X-ray bone densitometers. The Monte Carlo method is adopted, and a voxel model constructed based on patient computed tomography (CT) image data is established. High-energy and low-energy X-ray energy spectra generated via simulation are used to irradiate the lumbar region of the voxel model separately to obtain bone density images. The figure of merit (FOM) of each image is calculated, where FOM is based on the data recorded by the detector...