光子计数检测器CT中虚拟单能图像与双源双能CT的性能改进:基于傅立叶的评估。

IF 2.4 4区 医学 Q3 ENGINEERING, BIOMEDICAL
Hiroki Kawashima, Katsuhiro Ichikawa, Ryoichi Yoshida, Takuto Katayama, Makoto Arimoto, Jun Kataoka, Hiroji Nagata, Satoshi Kobayashi
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引用次数: 0

摘要

采用基于傅里叶的评估方法,与最新一代双源双能CT (DECT)相比,验证虚拟单能图像(VMIs)在临床光子计数检测器CT (PCD CT)碘对比任务中的性能改善。采用PCD CT和DECT扫描直径为300 mm的水浴,其中含有相当于稀释碘(2和12 mg/mL)的杆状幻影,分别在15、7.5和3 mGy下进行扫描。vmi的生成不需要任何迭代重建算法。评估了70和40 keV下VMIs的任务传递函数(TTF)、噪声功率谱(NPS)和切片灵敏度分布。比较了TTF2/NPS计算的可探测性指数(d')和系统性能函数平方(SPF2)。在40 keV时,PCD CT的d′值高于DECT,增幅为25.7 ~ 39.9%,而在70 keV时,两者差异不大。随着空间频率的增加,PCD CT在40 keV处的SPF2值显著高于DECT。SPF2值越高,图像噪声越低,杆状影的边缘越清晰。PCD CT在40 keV时VMIs的d′和SPF2明显高于DECT,这印证了之前各种研究报道的PCD CT的临床优势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance improvements of virtual monoenergetic images in photon-counting detector CT compared with dual source dual-energy CT: Fourier-based assessment.

To confirm the performance improvement of virtual monoenergetic images (VMIs) for iodine contrast tasks in a clinical photon-counting detector CT (PCD CT) using Fourier-based assessment, compared with those in the latest-generation dual-source dual-energy CT (DECT). A water-filled bath with a diameter of 300 mm, which contains rod-shaped phantoms equivalent to diluted iodine (2 and 12 mg/mL), was scanned using PCD CT and DECT at 15, 7.5, and 3 mGy. VMIs were generated without any iterative reconstruction algorithm. Task transfer function (TTF), noise power spectrum (NPS), and slice sensitivity profile were evaluated for VMIs at 70 and 40 keV. The detectability index (d') and the squared system performance function (SPF2) calculated by TTF2/NPS were compared. At 40 keV, the d' values of PCD CT were higher (percentage increase of 25.7-39.9%) than those of DECT, whereas at 70 keV, the difference was rather small. The SPF2 values at 40 keV of PCD CT grew notably higher than those of DECT as the spatial frequency increased. The higher SPF2 values endorsed the lower image noise and the sharper edge of the rod phantom as observed. The d' and SPF2 in VMIs at 40 keV of PCD CT were notably higher than those of DECT, which endorsed the clinical advantages of PCD CT that had been previously reported in various studies.

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CiteScore
8.40
自引率
4.50%
发文量
110
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