一种中能辐射照相降散射网栅的改进及验证

刘文杰; 景越峰; 刘军; 宋科峰; 陈坤

doi:10.11884/HPLPB201830.180216

一种中能辐射照相降散射网栅的改进及验证

doi: 10.11884/HPLPB201830.180216

中国工程物理研究院流体物理研究所, 四川绵阳 621900

基金项目:

国家自然科学基金项目 21677134

详细信息

作者简介:
刘文杰(1982—)，男，博士，副研究员，主要从事X光照相技术方面的研究；wjliu@caep.cn

通讯作者:
宋科峰(1982—)，男，博士，助理研究员，主要从事X光照相模拟研究；skyvisitor@126.com

陈坤(1987—)，男，博士，助理研究员，主要从事X光照相技术实验研究；chenkun@caep.cn

中图分类号: O434.19
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出版历程
- 收稿日期: 2018-08-11
- 修回日期: 2018-11-04
- 刊出日期: 2018-12-15

Improving and testing of anti-scatter grid for medium-energy radiography

Institute of Fluid Physics, CAEP, Mianyang 621900, China

摘要

摘要: 为提高中能闪光照相实验能力，给高能闪光照相的网栅设计制造提供新的思路，结合前期2 mm厚网栅降散射的研究成果，通过同时考虑网栅投射立体角的有阻挡和无阻挡部分，分析了不同光子能量下网栅厚度对降散射效果的影响，并设计制造了一种具有更高网栅比的网栅。采用100 kV光源对空心球体成像的实验验证其降散射效果，结果表明，网栅使图像对比度获得近1倍提升。采用实际的实验布局作为输入开展了蒙特卡罗模拟，验证比较了新设计网栅降散射效果，其降散射比高达1000∶1。
- X射线光学 /
- 中能辐射照相 /
- 降散射网栅 /
- 蒙特卡罗模拟
Abstract: In this work an anti-scatter grid with higher grid ratio was designed and fabricated based on our previous 2mm grid studies. To clarify the influence of grid thickness and phonon energy on scattering reduction, the acceptance solid angle of a single grid hole was analyzed carefully, where both blocked and unblocked ray were considered. A radiographic experiment and a Monte Carlo simulation were conducted to verify the performance of the grid. Results indicate the contrast of image was nearly doubled when a grid was used. Scatter rejection of the grid was estimated to be at least 1000∶1, which is high enough to suppress most of the scatterings in various application scenes. Results in this work would be helpful in improving the image property of the medium-energy radiography and could be supplied as a valuable reference when designing and fabricating an anti-scatter grid for high-energy flash radiography.
- X-ray optics /
- medium-energy radiography /
- anti-scatter grid /
- Monte Carlo simulation

HTML全文

图 1 散射光入射单个小孔示意图

Figure 1. Schematic of a scattered ray transferring through a single grid hole

下载: 全尺寸图片幻灯片

图 2 透射立体角与网栅厚度以及散射光能量的关系

Figure 2. Transmission solid angle profiles for different thicknesses of grid and energies of scattered photon

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图 3 X光辐射实验示意图

Figure 3. Schematic of X-ray radiographic experiment

下载: 全尺寸图片幻灯片

图 4 重采样前后的网栅照相图像

Figure 4. Images before and after resampling

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图 5 实验所得网栅透过率

Figure 5. Transmittance of grid derived by experiment

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图 6 有无网栅时的样品图像

Figure 6. Sample images with and without grid

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图 7 过样品中心的图像截面灰度比较

Figure 7. Comparison of the gray profile for sample

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图 8 MCNP模拟结果

Figure 8. Simulation results of MCNP

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表 1 有无网栅时图像对比度比较

Table 1. Contrast comparison between the cases with and without grid

thickness of PMMA plate/mm	without grid, R_s		with grid, R_g
thickness of PMMA plate/mm	MC simulation	experiment	MC simulation	experiment
40	1.366	1.679	2.392	2.465
80	1.249	1.470	2.312	2.326
—*		1.044		1.265
*2 mm grid case in our former work.

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