Reduction of metal artifact from cryoprobe using tilt CT scanning with metal artifact reduction algorithms for CT-guided cryoablation.

IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Radiological Physics and Technology Pub Date : 2025-06-17 DOI:10.1007/s12194-025-00923-0

Tomohiro Inoue, Noriyuki Umakoshi, Yusuke Matsui, Shota Tanaka, Takatsugu Yamauchi, Toshihiro Iguchi, Koji Tomita, Mayu Uka, Mitsugi Honda, Takao Hiraki

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引用次数: 0

Abstract

Computed tomography (CT) is a simple and useful method for monitoring during cryoablation; however, image quality is degraded by artifacts caused by the cryoprobe used during treatment. We evaluated the effectiveness of combining tilt scanning and single-energy metal artifact reduction (SEMAR) to improve image quality. A cryoprobe was inserted into an agar phantom, and CT scans were performed at various angles (0°, 5°, 10°, 15°, and 20°) with and without metal artifact reduction. The relative artifact index, calculated using the CT value standard deviation, was used to evaluate the intensity. The strongest tip artifacts occurred at 0°. The relative artifact index decreased with increasing tilt angles. The tilted scanning reduced artifacts extending beyond the cryoprobe tip, but SEMAR demonstrated a limited effect on artifact reduction. The tilted scanning method may be a useful approach for improving the image quality around the cryoprobe without increasing the exposure dose.

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利用倾斜CT扫描减少低温探针产生的金属伪影，并采用金属伪影减少算法进行CT引导下的冷冻消融。

计算机断层扫描（CT）是一种简单而有用的冷冻消融监测方法；然而，在处理过程中使用的冷冻探针引起的伪影会降低图像质量。我们评估了结合倾斜扫描和单能量金属伪影减少（SEMAR）来改善图像质量的有效性。将冷冻探针插入琼脂假体，并在不同角度（0°，5°，10°，15°和20°）进行CT扫描，并进行金属伪影还原。采用CT值标准差计算的相对伪影指数评价其强度。最强的尖端伪影发生在0°。相对伪影指数随倾斜角度的增大而减小。倾斜扫描减少了延伸到低温探针尖端以外的伪影，但SEMAR对伪影的减少效果有限。倾斜扫描方法可以在不增加暴露剂量的情况下改善冷冻探针周围的图像质量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiological Physics and Technology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

3.00

自引率

12.50%

发文量

期刊介绍： The purpose of the journal Radiological Physics and Technology is to provide a forum for sharing new knowledge related to research and development in radiological science and technology, including medical physics and radiological technology in diagnostic radiology, nuclear medicine, and radiation therapy among many other radiological disciplines, as well as to contribute to progress and improvement in medical practice and patient health care.