铊心肌灌注单光子发射计算机断层扫描中未平滑图像方法的屏蔽有用性评估。

Evaluation of the usefulness of the masking on un-smoothed image method in Tl myocardial perfusion SPECT.

作者信息

Miyajima Ryuichi, Ueno Ryo, Ichino Ryosuke, Teraoka Satomi, Yasushi Ishikawa, Sonoda Masahiro

机构信息

Department of Radiology, NHO Nagasaki Medical Center, 2-1001-1, Kubara, Omura, Nagasaki, 856-8562, Japan.

Department of Radiology, NHO Fukuokahigashi Medical Center, 1-1-1, Chidori, Koga, Fukuoka, 811-3113, Japan.

出版信息

Radiol Phys Technol. 2025 Sep 10. doi: 10.1007/s12194-025-00959-2.

DOI:10.1007/s12194-025-00959-2

PMID:40926170

Abstract

In Tl myocardial perfusion single-photon emission computed tomography (SPECT), gastric wall uptake can impact the inferior wall. This study aimed to evaluate the effectiveness and usefulness of the masking on un-smoothed image (MUS) method for Tl myocardial perfusion SPECT. A hemispherical gastric wall phantom was created to simulate the gastric fundus located closest to the myocardium, and the activity was enclosed to achieve an SPECT count ratio against the myocardium equivalent to that observed in clinical practice. The minimum values of the defect chip in the circumferential profile curve were compared for six SPECT count ratios and seven gap distances. In the conventional method, increasing SPECT count ratios or gap distances interfered with myocardial perfusion SPECT evaluation. Artifacts were less apparent when the MUS method was applied. The MUS method effectively suppressed the gastric wall uptake on Tl myocardial perfusion SPECT.

摘要

在铊心肌灌注单光子发射计算机断层扫描（SPECT）中，胃壁摄取会影响下壁。本研究旨在评估用于铊心肌灌注SPECT的未平滑图像掩蔽（MUS）方法的有效性和实用性。制作了一个半球形胃壁模型来模拟最靠近心肌的胃底，并设置其放射性活度，以使SPECT对心肌的计数比达到临床实际观察到的数值。比较了六种SPECT计数比和七种间隙距离下圆周轮廓曲线中缺损芯片的最小值。在传统方法中，增加SPECT计数比或间隙距离会干扰心肌灌注SPECT评估。应用MUS方法时伪影不太明显。MUS方法有效抑制了铊心肌灌注SPECT中的胃壁摄取。