噪声和物体直径对AAPM CT性能体模图像低对比度检测能力的定量影响

IF 0.6 Q4 NUCLEAR SCIENCE & TECHNOLOGY

Atom Indonesia Pub Date : 2023-04-15 DOI:10.55981/aij.2023.1228

E. Setiawati, C. Anam, W. Widyasari, G. Dougherty

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引用次数: 0

摘要

用于确定计算机断层扫描（CT）图像质量的参数包括噪声和低对比度可检测性。使用AAPM CT性能体模对低对比度可检测性的研究有几个局限性，例如缺乏关于噪声和物体大小对低对比率可检测性影响的定量信息。在本研究中，研究了噪声和物体直径对低对比度可检测性的定量影响。美国医学物理学家协会（AAPM）CT性能体模模型610的图像是用120 kV的管电压和50、100、150和200 mA的管电流采集的。AAPM CT性能体模型610的低对比度部分有直径在2.5和7.5 mm之间的物体。我们分析了平均CT数、噪声水平、信噪比（SNR），以及使用MatLab软件获取的对比度噪声比（CNR）。结果表明，噪声和物体尺寸影响低对比度的可检测性。CNRs随着物体直径的增加而线性增加，对于50、100、150和200mA的管电流，R2分别为0.88、0.67、0.75和0.83。

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The Quantitative Effect of Noise and Object Diameter on Low-Contrast Detectability of AAPM CT Performance Phantom Images

Parameters for determining computed tomography (CT) image quality include noise and low-contrast detectability. Studies on low-contrast detectability using the AAPM CT performance phantom have several limitations, such as the absence of quantitative information on the effect of noise and object size on low-contrast detectability. In this study, the quantitative effect of noise and object diameter on low-contrast detectability were investigated. Images of the American Association of Physicists in Medicine (AAPM) CT performance phantom model 610 were acquired with a tube voltage of 120 kV and tube currents of 50, 100, 150, and 200 mA. The low-contrast section of the AAPM CT performance phantom model 610 has objects with diameters between 2.5 and 7.5 mm. We analysed the mean CT number, noise level, signal-to noise ratio (SNR), and contrast-to-noise ratio (CNR), acquired using MatLab software. The results obtained indicate that noise and object size affect low-contrast detectability. The CNRs increase linearly with increasing of object diameter with R2 of 0.88, 0.67, 0.75, and 0.83 for tube currents of 50, 100, 150 and 200 mA, respectively.

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来源期刊

Atom Indonesia NUCLEAR SCIENCE & TECHNOLOGY-

CiteScore

1.00

自引率

0.00%

发文量

审稿时长

16 weeks

期刊介绍： The focus of Atom Indonesia is research and development in nuclear science and technology. The scope of this journal covers experimental and analytical research in nuclear science and technology. The topics include nuclear physics, reactor physics, radioactive waste, fuel element, radioisotopes, radiopharmacy, radiation, and neutron scattering, as well as their utilization in agriculture, industry, health, environment, energy, material science and technology, and related fields.