Method for determining slice sensitivity profile of iterative reconstruction CT images using low-contrast sphere phantom
Method for determining slice sensitivity profile of iterative reconstruction CT images using low-contrast sphere phantom
复制标题
使用低对比度球体模型确定迭代重建 CT 图像的切片灵敏度分布的方法
DOI:
10.1007/s12194-021-00636-0
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发表时间:
2021
影响因子:
1.6
通讯作者:
Noto Yoshiyuki
中科院分区:
文献类型:
--
作者:
Narita Akihiro;Ohkubo Masaki;Fukaya Takahiro;Noto Yoshiyuki
A novel method for measuring the slice sensitivity profile (SSP) of computed tomography (CT) images reconstructed using an iterative reconstruction (IR) algorithm is proposed herein. A phantom that included a low-contrast spherical object was scanned and consecutive cross-sectional images were reconstructed. The mean CT values in a region including the sphere were measured for all images and plotted as a function of slice position along the longitudinaldirection to yield a mean CT value profile. Next, we numerically generated an object function corresponding to the sphere and obtained the mean CT value profile. Subsequently, the SSP was modeled as a product of the Gaussian and cosine functions. We convolvedwith the modeled SSP to obtain. The difference betweenandwas evaluated using the root mean square error (RMSE), which was minimized via optimization of the SSP model parameters. To validate the methodology, we first used filtered back projection (FBP) images to compare the SSPs determined using the proposed and standard coin methods. Subsequently, the proposed method was applied to measure the SSPs of four types of IR algorithms in two scanners. The SSPs of the FBP images determined using the proposed and coin methods showed good agreement. Additionally, in the SSP measurements using the proposed method,agreed well withfor every IR algorithm. The RMSEs for all measurements were less than 0.7 HU, indicating the accuracy of the SSPs. Thus, the proposed method is effective for obtaining valid SSPs.
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影响因子:
3.8
作者:
Samei, Ehsan;Bakalyar, Donovan;Wang, Jia
通讯作者:
Wang, Jia
DOI:
--
发表时间:
2020
期刊:
影响因子:
--
作者:
Saeko Mochinaga;Yuto Iwabuchi;Keiichi Nomura;Hiroyuki Ota;Keisuke Fujii;Takahiro Goto;Yoshihisa Muramatsu
通讯作者:
Yoshihisa Muramatsu
影响因子:
1.6
作者:
Urikura, Atsushi;Ichikawa, Katsuhiro;Nakaya, Yoshihiro
通讯作者:
Nakaya, Yoshihiro
影响因子:
3.8
作者:
Chen, Baiyu;Christianson, Olav;Samei, Ehsan
通讯作者:
Samei, Ehsan
影响因子:
3.8
作者:
Boone, JM
通讯作者:
Boone, JM