能量积分和深硅光子计数 CT 的空间分辨率保真度比较:对肺部成像的影响

IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Journal of Thoracic Imaging Pub Date : 2024-11-01 Epub Date: 2024-05-07 DOI:10.1097/RTI.0000000000000788
Aria M Salyapongse, Jeffrey P Kanne, Prashant Nagpal, Nicholas C Laucis, B Keegan Markhardt, Zhye Yin, Scott Slavic, Meghan G Lubner, Timothy P Szczykutowicz
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引用次数: 0

摘要

目的:我们研究了深硅光子计数探测器(PCD)CT 扫描仪原型偏离等中心的空间分辨率损失,并与临床能量积分探测器(EID)CT 扫描仪进行了比较:我们在四个位置(等中心、偏离等中心 6.7、11.8 和 17.1 厘米)对金属丝模型进行了三次扫描。采集模式为 120 kV EID CT、120 kV 高清晰度 (HD) EID CT 和 120 kV PCD CT。高清模式每次旋转的投影视角是 "常规 "EID 扫描模式的两倍。线的直径是通过在线的径向和方位角方向上绘制的轮廓的最大半宽(FWHM)来计算的。通过计算相对于等中心的径向和方位直径之比来评估金属丝直径外观的变化。采用 t 检验对每次采集的金属丝直径之比以及平均比率与统一值的差异进行配对比较:结果:深硅 PCD CT 在统计学上具有更小的线径比:与 EID CT 相比,深硅 PCD CT 在径向和方位方向上的空间分辨率变化较小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatial Resolution Fidelity Comparison Between Energy Integrating and Deep Silicon Photon Counting CT: Implications for Pulmonary Imaging.

Purpose: We investigated spatial resolution loss away from isocenter for a prototype deep silicon photon-counting detector (PCD) CT scanner and compare with a clinical energy-integrating detector (EID) CT scanner.

Materials and methods: We performed three scans on a wire phantom at four positions (isocenter, 6.7, 11.8, and 17.1 cm off isocenter). The acquisition modes were 120 kV EID CT, 120 kV high-definition (HD) EID CT, and 120 kV PCD CT. HD mode used double the projection view angles per rotation as the "regular" EID scan mode. The diameter of the wire was calculated by taking the full width of half max (FWHM) of a profile drawn over the radial and azimuthal directions of the wire. Change in wire diameter appearance was assessed by calculating the ratio of the radial and azimuthal diameter relative to isocenter. t tests were used to make pairwise comparisons of the wire diameter ratio with each acquisition and mean ratios' difference from unity.

Results: Deep silicon PCD CT had statistically smaller ( P <0.05) changes in diameter ratio for both radial and azimuthal directions compared with both regular and HD EID modes and was not statistically different from unity ( P <0.05). Maximum increases in FWMH relative to isocenter were 36%, 12%, and 1% for regular EID, HD EID, and deep silicon PCD, respectively.

Conclusion: Deep silicon PCD CT exhibits less change in spatial resolution in both the radial and azimuthal directions compared with EID CT.

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来源期刊
Journal of Thoracic Imaging
Journal of Thoracic Imaging 医学-核医学
CiteScore
7.10
自引率
9.10%
发文量
87
审稿时长
6-12 weeks
期刊介绍: Journal of Thoracic Imaging (JTI) provides authoritative information on all aspects of the use of imaging techniques in the diagnosis of cardiac and pulmonary diseases. Original articles and analytical reviews published in this timely journal provide the very latest thinking of leading experts concerning the use of chest radiography, computed tomography, magnetic resonance imaging, positron emission tomography, ultrasound, and all other promising imaging techniques in cardiopulmonary radiology. Official Journal of the Society of Thoracic Radiology: Japanese Society of Thoracic Radiology Korean Society of Thoracic Radiology European Society of Thoracic Imaging.
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