Variation kVp and mAs on CT scan image quality using standard phantom
Variation kVp and mAs on CT scan image quality using standard phantom
复制标题
使用标准体模的 CT 扫描图像质量的 kVp 和 mAs 变化
DOI：
10.1063/5.0030320
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Guntur Winarno
中科院分区：
文献类型：
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作者：
Muhammad Irsal;Nurbaiti;A. Mukhtar;A. Jauhari;Guntur Winarno
保持图像质量是对CT扫描进行常规质量保证。评价图像质量的几个重要参数包括CT值、均匀性和线性、低对比度。研究方法使用参数kVp和mA的变化，限制参数仅在80、100、140 kVp和192 mAs以及100、200、300 mAs和120 kVp的变化中使用。之前考虑将菲利普斯Incidity CT扫描应用程序的参数作为头部检查常规和审查的参考。推荐HU值和执行的HU值测量之间的CT数值研究结果具有接近的值，因此CT扫描的CT数值仍处于非常好的范围内，体模中心和体模周围的均匀性HU值为-0.854 <$0.402（顺时针12，3，6，9）-1，374 0，396，结果均匀，仍在±5 HU的公差范围内。线性方程HU值与线性函数R2= 0.8692，表明衰减系数HU值之间有很强的相关性。四分位数分析的HU值的kVp和mAs随第二个四分位数值的结果而变化。在mAs 100、200和300的变化中，数值无显著差异且趋于相同，即100 mAs Q2值=92.04、200 mAs Q2=93.62、300 mAs Q2值=92.05，而在kVp变化中存在显著差异，即80 kVp Q2=99.12，140 kVp Q2=89.59。因此，HU值不受mAs参数的影响，可以说对比度分辨率的图像质量没有显著变化;低对比度但受kVp参数的影响，当kV增加60 kVp时，HU值增加约36%。
Maintain image quality is to conduct quality assurance routinely on CT scan. There are several important parameters in the assessment of image quality including CT number, uniformity and linearity, low contrast. The research method uses the variation of the parameters kVp and mA with restrictions on the use of parameters only in variations of 80, 100, 140 kVp with 192 mAs and 100, 200, 300 mAs with 120 kVp. previously considered the parameters of the Phillips Ingenuity CT scan application for the head examination routine and review as a reference. The results of the study for the CT number value between the recommended HU value and the measurement of the HU value performed have a value that is close to, so that for the CT number the CT scan is still in very good range, for the Uniformity HU value at the center of the phantom -0.854±0.402 and around the phantom (clockwise 12,3,6,9) -1,374±0,396, results are uniformity still within the tolerance range of±5 HU. Linearity HU value equation linear function with R2= 0.8692, indicating that a very strong correlation between the value of the attenuation coefficient HU. Quartile analysis of HU values for the kVp and mAs varies with the results of the second quartile value. Of the variations of mAs 100, 200 and 300 there were no significant differences in the values and tended to be the same, namely for 100 mAs Q2 values=92.04, 200 mAs Q2=93.62, 300 mAs Q2 values=92.05, while in the kVp variations there were significant differences i.e. 80 kVp Q2=99.12, 140 kVp Q2=89.59. So that the HU value is not affected by the mAs parameter, it can be said that there is no significant change in image quality from the contrast resolution; low contrast but it is influenced by the kVp parameter with a value of HU increase of about 36% when kV is increased by range of 60 kVp.