Petoussi-Henss Nina, Schlattl Helmut, Becker Janine, Greiter Matthias, Zankl Maria, Hoeschen Christoph
Institute of Radiation Protection , Helmholtz Zentrum München, Neuherberg, Germany.
Individual Monitoring Service , Helmholtz Zentrum München, Neuherberg, Germany.
J Med Imaging (Bellingham). 2017 Jan;4(1):013509. doi: 10.1117/1.JMI.4.1.013509. Epub 2017 Mar 30.
Using numerical simulations, the influence of various imaging parameters on the resulting image can be determined for various imaging technologies. To achieve this, visualization of fine tissue structures needed to evaluate the image quality with different radiation quality and dose is essential. The present work examines a method that employs simulations of the imaging process using Monte Carlo methods and a combination of a standard and higher resolution voxel models. A hybrid model, based on nonlinear uniform rational B-spline and polygon mesh surfaces, was constructed from an existing voxel model of a female patient of a resolution in the range of millimeters. The resolution of the hybrid model was [Formula: see text], i.e., substantially finer than that of the original model. Furthermore, a high resolution lung voxel model [[Formula: see text] voxel volume, slice thickness: [Formula: see text]] was developed from the specimen of a left lung lobe. This has been inserted into the hybrid model, substituting its left lung lobe and resulting in a dual-lattice geometry model. "Dual lattice" means, in this context, the combination of voxel models with different resolutions. Monte Carlo simulations of radiographic imaging were performed and the fine structure of the lung was easily recognizable.
通过数值模拟，可以针对各种成像技术确定各种成像参数对所得图像的影响。为此，可视化精细组织结构对于评估不同辐射质量和剂量下的图像质量至关重要。本研究考察了一种方法，该方法利用蒙特卡罗方法对成像过程进行模拟，并结合标准分辨率和高分辨率体素模型。基于非线性均匀有理B样条和多边形网格表面构建了一个混合模型，该模型由一名分辨率在毫米范围内的女性患者的现有体素模型构建而成。混合模型的分辨率为[公式：见正文]，即比原始模型的分辨率精细得多。此外，从左肺叶标本开发了一个高分辨率肺体素模型[[公式：见正文]体素体积，切片厚度：[公式：见正文]]。该模型已插入混合模型中，替换其左肺叶，从而得到一个双晶格几何模型。在此背景下，“双晶格”指的是不同分辨率体素模型的组合。进行了射线照相成像的蒙特卡罗模拟，肺部的精细结构很容易识别。
