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在68Ga-PSMA PET-CT研究中对区块序列规范期望最大化 (BSREM) 重建算法的幻影和临床评估

Fatemeh Sadeghi^1,2, Peyman Sheikhzadeh^3,4, Nima Kasraie⁵

¹Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran.

Physical and engineering sciences in medicine

|July 13, 2023

概括

为PET成像优化区块顺序规范期望最大化 (BSREM) 算法,需要仔细选择β值. 这项研究发现了特定的最佳β值,用于重建幻象和临床前列腺癌成像中的小和大病变.

科学领域:

核医学就是核医学.
医学成像物理医学成像物理

背景情况:

像素发射断层扫描 (PET) 成像对于癌症的诊断和监测至关重要.
像有序子集预期最大化 (OSEM) 和区块序列规则化预期最大化 (BSREM) 这样的图像重建算法会影响图像质量.
确定BSREM的最佳参数对于准确的病变检测和表征至关重要.

研究的目的:

研究BSREM算法的不同β值对损伤重建的影响.
在68Ga-PSMA PET/CT成像中确定不同损伤大小的最佳β值.
为了比较BSREM的性能与OSEM的幻象和临床前列腺癌数据.

主要方法:

使用国家电气制造商协会的幻影和15名前列腺癌患者用68Ga-PSMA PET/CT扫描.
使用OSEM和BSREM重建的图像,具有一系列β值.
量化图像质量指标,包括背景变化,对比度恢复,信号与噪声比和信号与背景比 (SBR).

主要成果:

与OSEM相比,较低β值的BSREM改善了对比度恢复和信号对噪声比率.
发现,用于重建的最佳β值与病变大小相反相关.
特定的β值 (小病变为400,大病变为600/500) 在幻影和临床数据中表现出优异的性能.

结论:

在BSREM中选择β值显著影响不同大小的病变的重建.
在幻影和临床68Ga-PSMA PET/CT研究中,建议小病变和大病变的最佳β值分别为400,600和500.
这种参数优化可以提高前列腺癌成像诊断的准确性.

关键词:

贝叶斯的方法是贝叶斯的方法.图像重建图像重建通过PET-CT扫描进行PET-CT扫描.前列腺癌是什么意思前列腺癌是什么意思

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