Reduction in variability of dopamine transporter measures using SPECT and ultra-high-resolution fan beam collimators: comparison with parallel-hole collimators in healthy controls for a clinical reference database

IF 2.3 4区 医学 Q2 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Clinical and Translational Imaging Pub Date : 2024-02-24 DOI:10.1007/s40336-023-00613-0
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Abstract

Purpose

The purpose of this study was to create 123I-FP-CIT reference values for ultra-high-resolution fan beam collimators (UHR-FB) from a sample of subjects without dopaminergic degeneration and to compare them to a normal database -PPMI database- of a commercial software (DaTQUANT) obtained using high-resolution parallel-hole collimators (HR-PH).

Methods

A striatal phantom study was performed to compare UHR-FB with HR-PH and to obtain a correction factor between collimators. Normal 123I-FP-CIT studies from 177 subjects acquired using UHR-FB were retrospectively selected on the basis of visual and semi-quantitative analysis as well as of the neurological follow-up (range of 2–9 years). SPECT images were reconstructed using the same parameters of DaTQUANT normal database and SBR values were obtained for striatal structures. Correction factor was applied to the UHR-FB database to test differences against DaTQUANT database.

Results

Correction factor obtained from the phantom study was 0.84. Uncorrected SBR values of the local database were significantly higher than PPMI database values, but no significant differences were found using corrected values. Coefficients of variations of SBR values were significantly lower in a local database than PPMI database (15% vs 20%). Significant effects of age on SBR were observed in both databases with a reduction rate for a decade of 6% in the PPMI database and 4.5% in the local database. In the latter, women had slightly higher SBR values and a steeper decline with advancing age compared to men, whereas no significant gender differences were found in the PPMI database.

Conclusion

The SBR values obtained using UHR-FB have an age-related distribution comparable to that of healthy subjects but with lower variability. The reduction rate per decade was similar between the two databases but the gender effect was found only in the local database, probably related to the better performance of UHR-FB.

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使用 SPECT 和超高分辨率扇形光束准直器降低多巴胺转运体测量结果的变异性:与平行孔准直器在临床参考数据库健康对照组中的比较
摘要 目的 本研究的目的是从无多巴胺能变性的受试者样本中为超高分辨率扇形光束准直器(UHR-FB)创建 123I-FP-CIT 参考值,并将其与使用高分辨率平行孔准直器(HR-PH)获得的商业软件(DaTQUANT)的正常数据库 -PPMI 数据库 - 进行比较。 方法 为了比较 UHR-FB 和 HR-PH,并获得准直器之间的校正因子,进行了纹状体模型研究。根据视觉和半定量分析以及神经系统随访(2-9 年)情况,对 177 名使用 UHR-FB 采集的正常 123I-FP-CIT 研究对象进行了回顾性筛选。使用与 DaTQUANT 正常数据库相同的参数重建 SPECT 图像,并获得纹状体结构的 SBR 值。将校正因子应用于 UHR-FB 数据库,以检验与 DaTQUANT 数据库的差异。 结果 从模型研究中获得的校正因子为 0.84。本地数据库未经校正的 SBR 值明显高于 PPMI 数据库的值,但使用校正后的值则没有发现明显差异。本地数据库的 SBR 值变异系数明显低于 PPMI 数据库(15% 对 20%)。在两个数据库中都观察到了年龄对 SBR 的显著影响,在 PPMI 数据库中,每十年的降低率为 6%,而在本地数据库中为 4.5%。在本地数据库中,女性的 SBR 值略高于男性,而且随着年龄的增长,女性的 SBR 值下降得更快,而在 PPMI 数据库中则没有发现明显的性别差异。 结论 使用 UHR-FB 获得的 SBR 值与健康人的年龄分布相当,但变异性较低。两个数据库每十年的降低率相似,但只有在本地数据库中发现了性别效应,这可能与 UHR-FB 性能更好有关。
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来源期刊
Clinical and Translational Imaging
Clinical and Translational Imaging Medicine-Radiology, Nuclear Medicine and Imaging
CiteScore
3.60
自引率
4.80%
发文量
55
期刊介绍: Clinical and Translational Imaging is an international journal that publishes timely, up-to-date summaries on clinical practice and translational research and clinical applications of approved and experimental radiopharmaceuticals for diagnostic and therapeutic purposes. Coverage includes such topics as advanced preclinical evidence in the fields of physics, dosimetry, radiation biology and radiopharmacy with relevance to applications in human subjects. The journal benefits a readership of nuclear medicine practitioners and allied professionals involved in molecular imaging and therapy.
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