Effect of single-photon emission computed tomography acquisition method and sampling angles on image quality and quantitative accuracy in xSPECT-reconstructed images.

IF 1.3 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Nuclear Medicine Communications Pub Date : 2024-11-01 Epub Date: 2024-08-05 DOI:10.1097/MNM.0000000000001883
Daisuke Hasegawa, Toshihiro Iguchi, Masayasu Takatani, Kotaro Tokunaga, Takuma Minoda, Masahiro Miyai
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Abstract

Objective: The aim of this study was to evaluate the effects of the single-photon emission computed tomography (SPECT) acquisition method and sampling angles on the qualitative and quantitative interpretations of xSPECT-reconstructed images.

Methods: The spatial resolution was evaluated using a JSP phantom, and the uniformity and quantitative accuracy were verified with a NEMA IEC Body Phantom using an SIEMENS Symbia Intevo SPECT/computed tomography system. SPECT was performed using three acquisition methods (step-and-shoot, continuous, and acquire during the step), and the sampling angles were set to 2, 3, 4, 5, and 6°. The xSPECT-reconstruction technology which is used with ordered subset-conjugated gradient minimization was used for image reconstruction.

Results: Full width of half maximum, an evaluation index of spatial resolution, varied up to 2.73 mm with different sampling angles and up to 2.06 mm with different acquisition methods. Uniformity, as assessed by the coefficient of variation, improved with increasing sampling angles. The accuracy of the quantification of the hot sphere showed an error rate of approximately 10% depending on the sampling angle, and an error rate of approximately 5% depending on the different acquisition methods.

Conclusions: In xSPECT-reconstructed images, the difference in sampling angle has a greater impact on image quality and quantitativity than the difference in the acquisition method. For tests in which uniformity is important, a larger sampling angle is recommended.

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单光子发射计算机断层扫描采集方法和取样角度对 xSPECT 重建图像质量和定量准确性的影响。
研究目的本研究旨在评估单光子发射计算机断层扫描(SPECT)采集方法和取样角度对 xSPECT 重建图像的定性和定量解释的影响:使用西门子 Symbia Intevo SPECT/计算机断层扫描系统,用 JSP 人体模型评估空间分辨率,用 NEMA IEC 人体模型验证均匀性和定量准确性。SPECT 采用三种采集方法(步进拍摄、连续拍摄和步进期间采集)进行,采样角度分别设置为 2、3、4、5 和 6°。图像重建采用了有序子集共轭梯度最小化的 xSPECT 重建技术:半最大全宽是空间分辨率的评价指标,在不同的取样角度下最多可达到 2.73 毫米,在不同的采集方法下最多可达到 2.06 毫米。以变异系数评估的均匀性随着采样角度的增加而提高。热球定量的准确性显示,不同采样角度的误差率约为 10%,不同采集方法的误差率约为 5%:结论:在 xSPECT 重建图像中,采样角度的不同比采集方法的不同对图像质量和定量的影响更大。对于均匀性要求较高的测试,建议采用较大的取样角度。
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来源期刊
CiteScore
2.20
自引率
6.70%
发文量
212
审稿时长
3-8 weeks
期刊介绍: Nuclear Medicine Communications, the official journal of the British Nuclear Medicine Society, is a rapid communications journal covering nuclear medicine and molecular imaging with radionuclides, and the basic supporting sciences. As well as clinical research and commentary, manuscripts describing research on preclinical and basic sciences (radiochemistry, radiopharmacy, radiobiology, radiopharmacology, medical physics, computing and engineering, and technical and nursing professions involved in delivering nuclear medicine services) are welcomed, as the journal is intended to be of interest internationally to all members of the many medical and non-medical disciplines involved in nuclear medicine. In addition to papers reporting original studies, frankly written editorials and topical reviews are a regular feature of the journal.
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