Dual Energy Metal Artifact Reduction for Iodine-125 Seed Identification in Postimplant CT after Prostate Brachytherapy.

IF 1.8 4区医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING British Journal of Radiology Pub Date : 2024-11-04 DOI:10.1093/bjr/tqae225

Chiaki Suzuki, Kosuke Matsubara, Yuta Ujihara, Kenta Isogai

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Abstract

Objectives: To assess the metal artifact reductions of dual-energy computed tomography (DECT) high-energy virtual monochromatic images (VMI) combined with the single energy metal artifact reduction (SEMER) (CANON MEDICAL SYSTEMS, Otawara, Japan) processing techniques for iodine (I)-125 seed identification in postimplant computed tomography (CT) after prostate brachytherapy.

Methods: Dual-energy acquisition with fast tube voltage switching was performed on a prostate phantom with simulated seeds and six clinical cases treated with I-125 prostate brachytherapy. The images were retrospectively reconstructed at VMI energy levels of 65-200 keV and with and without SEMAR (SEMAR and non-SEMAR images). To estimate seed swelling, the caliber of iodine-125 seed was calculated as the full width at half maximum. The metal artifacts were evaluated using the artifact index (AI). The dose distributions were calculated and were compared among the high-energy VMI (SEMAR and non-SEMAR images) and low-energy VMI (SEMAR images).

Results: The blooming artifacts decreased at higher energy levels. In addition, the SEMAR process markedly reduced AI, which helped reduce overestimation of high dose ranges in the treatment planning dose map.

Conclusion: The locations and number of iodine-125 seed were clearly identified in the dose distribution map of the treatment planning using 200keV VMI with SEMAR.

Advance in knowledge: The high-energy VMI of the dual energy CT in combination with SEMAR is appropriate for the postimplant planning process of I-125 prostate brachytherapy.

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在前列腺近距离治疗后植入 CT 中识别碘-125 粒子时减少双能金属伪影

目的评估双能量计算机断层扫描（DECT）高能量虚拟单色图像（VMI）结合单能量金属伪影消除（SEMER）（日本大田原市 CANON 医疗系统公司）处理技术在前列腺近距离治疗后植入计算机断层扫描（CT）中识别碘（I）-125 粒子时的金属伪影消除效果：方法：对一个带有模拟种子的前列腺模型和六个接受 I-125 前列腺近距离治疗的临床病例进行了快速管电压切换的双能量采集。在 65-200 keV 的 VMI 能量水平下，以及在有 SEMAR 和没有 SEMAR 的情况下（SEMAR 和非 SEMAR 图像），对图像进行了回顾性重建。为了估算种子膨胀，碘-125 种子的口径是以半最大全宽计算的。金属伪影使用伪影指数（AI）进行评估。计算并比较了高能量 VMI（SEMAR 和非 SEMAR 图像）和低能量 VMI（SEMAR 图像）的剂量分布：结果：能量越高，花斑伪影越少。此外，SEMAR 过程明显减少了 AI，这有助于减少治疗计划剂量图中对高剂量范围的高估：结论：使用 200keV VMI 和 SEMAR 进行治疗规划时，碘-125 粒子的位置和数量在剂量分布图中得到了清晰的识别：知识的进步：双能 CT 的高能 VMI 与 SEMAR 的结合适用于 I-125 前列腺近距离放射治疗的植入后规划过程。

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

British Journal of Radiology 医学-核医学

CiteScore

5.30

自引率

3.80%

发文量

330

审稿时长

2-4 weeks

期刊介绍： BJR is the international research journal of the British Institute of Radiology and is the oldest scientific journal in the field of radiology and related sciences. Dating back to 1896, BJR’s history is radiology’s history, and the journal has featured some landmark papers such as the first description of Computed Tomography "Computerized transverse axial tomography" by Godfrey Hounsfield in 1973. A valuable historical resource, the complete BJR archive has been digitized from 1896. Quick Facts: - 2015 Impact Factor – 1.840 - Receipt to first decision – average of 6 weeks - Acceptance to online publication – average of 3 weeks - ISSN: 0007-1285 - eISSN: 1748-880X Open Access option