Monte Carlo evaluation of the spatial resolution and image quality in gamma cameras utilising lutetium–yttrium oxyorthosilicate scintillation detectors

IF 2.1 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Pramana Pub Date : 2025-08-26 DOI:10.1007/s12043-025-02984-7

M A Ghoneim, A A El-Rahman

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Abstract

Scintillator materials are widely used in industrial and medical imaging systems that utilise gamma cameras. This study evaluates image quality by modelling a gamma camera system with a pinhole collimator and a new scintillation detector (lutetium–yttrium oxyorthosilicate (LYSO)). This addition aims to improve the spatial resolution of the imaging system. The system is modelled using the Geant4 application for tomographic emission (GATE 9.1) tools. The pinhole collimator geometry was designed with various diameters and system magnification factors. Spatial resolution is assessed using two parameters: the full-width at half-maximum (FWHM) and the no-reference natural image quality evaluator (NIQE). Results show that both FWHM and NIQE values increase as the diameter of the pinhole collimator increases. Additionally, higher magnification factors improve spatial resolution and NIQE at the same pinhole diameter. The best FWHM value achieved is 0.66 ± 1.4 × 10⁻³ mm with a LYSO scintillation detector. These findings suggest that a gamma camera system equipped with a LYSO scintillation detector and a pinhole collimator has strong potential for high-resolution imaging applications.

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利用氧化硅酸镥钇闪烁探测器的伽马相机空间分辨率和图像质量的蒙特卡罗评价

闪烁体材料广泛应用于工业和医学成像系统，利用伽马相机。本研究通过模拟带有针孔准直器和新型闪烁探测器（氧化硅酸镥钇（LYSO））的伽马相机系统来评估图像质量。这一增加旨在提高成像系统的空间分辨率。该系统使用Geant4应用程序进行层析发射（GATE 9.1）工具建模。设计了不同直径和系统放大倍数的针孔准直器几何形状。空间分辨率的评估使用两个参数：半最大全宽度（FWHM）和无参考自然图像质量评估器（NIQE）。结果表明，随着针孔准直器直径的增大，FWHM和NIQE值均增大。此外，在相同针孔直径下，较高的放大倍率提高了空间分辨率和NIQE。使用LYSO闪烁探测器获得的最佳FWHM值为0.66±1.4 × 10−3 mm。这些发现表明，配备LYSO闪烁探测器和针孔准直器的伽马相机系统具有强大的高分辨率成像应用潜力。

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来源期刊

Pramana 物理-物理：综合

CiteScore

3.60

自引率

7.10%

发文量

206

审稿时长

3 months

期刊介绍： Pramana - Journal of Physics is a monthly research journal in English published by the Indian Academy of Sciences in collaboration with Indian National Science Academy and Indian Physics Association. The journal publishes refereed papers covering current research in Physics, both original contributions - research papers, brief reports or rapid communications - and invited reviews. Pramana also publishes special issues devoted to advances in specific areas of Physics and proceedings of select high quality conferences.