Federal Office for Radiation Protection, Ingolstädter Landstr. 1, 85764, Oberschleissheim, Germany.
Radiat Environ Biophys. 2021 Nov;60(4):681-684. doi: 10.1007/s00411-021-00939-1. Epub 2021 Aug 28.
A computer code called Virtual Igor is presented. The code generates an analytical representation of the Saint Petersburg brick phantom family (Igor, Olga, Irina), which is frequently used for the calibration of whole-body counters, in arbitrary user-defined layouts for the use in the Monte-Carlo radiation transport code MCNP. The computer code reads a file in the ldraw format, which can easily be produced by simple freeware software with graphical user interfaces and which contains the types and coordinates of the bricks. Ldraw files with the canonical layouts of the brick phantom are provided with Virtual Igor. The code determines the positions of (2.75 cm) segments of the bricks, where 2.75 cm is the smallest length in the layout and, therefore, represents the spacing of the segment lattice. Each segment contains the exact geometry of the respective part of the brick, using cuboid and cylindrical surfaces. The user can define which rod source drill holes of which bricks contain the rod-type radionuclide sources. The method facilitates the comparison of different layouts of the Saint Petersburg brick phantom with each other and with anthropomorphic computational phantoms.
介绍了一个名为 Virtual Igor 的计算机代码。该代码为圣彼得堡砖体模型家族（Igor、Olga、Irina）生成了一个分析表示，该家族经常用于全身计数器的校准，可在任意用户定义的布局中用于蒙特卡罗辐射输运代码 MCNP。该计算机代码读取 ldraw 格式的文件，该文件可以使用具有图形用户界面的简单免费软件轻松生成，并且包含砖块的类型和坐标。Virtual Igor 提供了具有规范布局的砖体模型的 ldraw 文件。该代码确定了（2.75 cm）砖块段的位置，2.75 cm 是布局中的最小长度，因此代表了段格的间距。每个段都使用长方体和圆柱面包含了砖块相应部分的精确几何形状。用户可以定义哪些砖的棒源钻孔包含棒状放射性核素源。该方法方便了圣彼得堡砖体模型的不同布局之间以及与人体计算模型之间的比较。
