Tungsten Target Optimization for Photon Fluence Maximization of a Transmission-Type Flat-Panel X-Ray Source by Monte Carlo Simulation and Experimental Measurement

被引：7

作者：

Wang, Kun ^{[1
]}

Xu, Yuan ^{[2
]}

Chen, Daokun ^{[1
]}

Zhang, Guofu ^{[1
]}

Zhang, Zhipeng ^{[1
]}

She, Juncong ^{[1
]}

Deng, Shaozhi ^{[1
]}

Xu, Ningsheng ^{[1
]}

Chen, Jun ^{[1
]}

机构：

[1] Sun Yat Sen Univ, Sch Elect & Informat Technol, Guangdong Prov Key Lab Display Mat & Technol, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China

[2] Southern Med Univ, Dept Biomed Engn, Guangzhou 510515, Guangdong, Peoples R China

来源：

IEEE TRANSACTIONS ON RADIATION AND PLASMA MEDICAL SCIENCES | 2018年 / 2卷 / 05期

关键词：

Flat-panel X-ray source; Monte Carlo (MC) simulation; target thickness; transmission-type target;

D O I：

10.1109/TRPMS.2018.2849099

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

The cold cathode flat-panel X-ray source is a new type of X-ray source with advantage of smaller footprint and lower-dose imaging than current sources. In this paper, we optimized the thickness of the anode target of a flat-panel X-ray source to maximize the photon fluence of X-rays generated from the device. Utilizing EGSnrc-based Monte Carlo code, X-ray fluence was calculate from the simulated photons deposited in the virtual detector. These results revealed an optimal target thickness at a specific anode voltage to maximize the output of X-ray intensity. For experimental validation, tungsten thin film anodes with different thicknesses were prepared, and a flat-panel X-ray source was fabricated using a ZnO nanowire cold cathode. A figure of merit was introduced to characterize the output efficiency of the X-rays. The experimental results agree well with the simulation results, showing an optimal tungsten-target thickness of 1200 nm at an anode voltage of 40 kV. Using a flat-panel X-ray source with the optimized anode thickness, we took X-ray absorption images of both biological and nonbiological subjects, and high-resolution images were demonstrated.

引用

页码：452 / 458

页数：7

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