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首页> 外文期刊>Medical Physics >A simple approach to measure computed tomography (CT) modulation transfer function (MTF) and noise-power spectrum (NPS) using the American College of Radiology (ACR) accreditation phantom.
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A simple approach to measure computed tomography (CT) modulation transfer function (MTF) and noise-power spectrum (NPS) using the American College of Radiology (ACR) accreditation phantom.

机译：一种使用美国放射学院（ACR）认证模型测量计算机断层扫描（CT）调制传递函数（MTF）和噪声功率谱（NPS）的简单方法。

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摘要

To develop an easily-implemented technique with free publicly-available analysis software to measure the modulation transfer function (MTF) and noise-power spectrum (NPS) of a clinical computed tomography (CT) system from images acquired using a widely-available and standardized American College of Radiology (ACR) CT accreditation phantom.Images of the ACR phantom were acquired on a Siemens SOMATOM Definition Flash system using a standard adult head protocol: 120 kVp, 300 mAs, and reconstructed voxel size of 0.49 mm × 0.49 mm × 4.67 mm. The radial (axial) MTF was measured using an edge method where the boundary of the third module of the ACR phantom, originally designed to measure uniformity and noise, was used as a circular edge. The 3D NPS was measured using images from this same module and using a previously-described methodology that quantifies noise magnitude and 3D noise correlation.The axial MTF was radially symmetrical and had a value of 0.1 at 0.62 mm(-1). The 3D NPS shape was consistent with the filter-ramp function of filtered-backprojection reconstruction algorithms and previously reported values. The radial NPS peak value was ～115 HU(2)mm(3) at ～0.25 mm(-1) and dropped to 0 HU(2)mm(3) by 0.8 mm(-1).The authors have developed an easily-implementable technique to measure the axial MTF and 3D NPS of clinical CT systems using an ACR phantom. The widespread availability of the phantom along with the free software the authors have provided will enable many different institutions to immediately measure MTF and NPS values for comparison of protocols and systems.
机译：使用免费的公共分析软件开发一种易于实施的技术，以从使用广泛可用的标准化图像获取的图像中测量临床计算机断层扫描（CT）系统的调制传递函数（MTF）和噪声功率谱（NPS）美国放射学院（ACR）CT认证体模。使用标准成人头部协议：120 kVp，300 mAs在Siemens SOMATOM Definition Flash系统上获取ACR体模的图像，并重建体素大小为0.49 mm×0.49 mm×4.67毫米使用边缘方法测量径向（轴向）MTF，其中最初设计为测量均匀性和噪声的ACR体模的第三模块的边界用作圆形边缘。使用来自同一模块的图像并使用量化噪声大小和3D噪声相关性的先前描述的方法来测量3D NPS。轴向MTF径向对称，在0.62 mm（-1）处的值为0.1。 3D NPS形状与滤波反投影重建算法的滤波斜坡功能和先前报告的值一致。径向NPS峰值在约0.25 mm（-1）时为〜115 HU（2）mm（3），而在0.8 mm（-1）处降至0 HU（2）mm（3）。一种可实现的技术，使用ACR体模测量临床CT系统的轴向MTF和3D NPS。幻影的广泛可用性以及作者提供的免费软件将使许多不同的机构能够立即测量MTF和NPS值，以比较协议和系统。

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