Effectiveness of 4-dimensional maximum intensity projection (4D-MIP) for respiratory motion management with uncertain interobserver delineation.

IF 1.1 4区医学 Q4 ONCOLOGY

Medical Dosimetry Pub Date : 2025-01-07 DOI:10.1016/j.meddos.2024.11.001

Satoki Hinai, Keisuke Usui, Yusuke Obara, Toshiya Maebayashi, Satoshi Ookubo, Atsushi Ichikawa, Yoshihisa Sasaki, Kazuo Ozawa

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引用次数: 0

Abstract

This study was conducted to evaluate the use of 4-dimensional (4D) maximum intensity projection (4D-MIP) to compensate for the disadvantages of average intensity projection (AIP), which is used to determine the internal target volume (ITV) in lung tumors. A respiratory motion phantom with a simulated tumor was imaged using 4D computed tomography (4D-CT). AIP and 4D-MIP were generated based on 10 phases of 4D-CT, followed by contouring of the ITV_AIP and ITV_MIP; these were compared with the ITV contoured in 10 phases of 4D-CT (ITV₁₀). Additionally, the profile curves of the ITV_AIP and ITV_MIP were obtained, and the full width at half maximum (FWHM) was measured. There was no significant difference between the ITV₁₀ and ITV_MIP; however, the ITV_AIP demonstrated a lower value. The FWHM values of the ITV_AIP were smaller than those of ITV_MIP owing to decreased CT values in the superior-inferior margin. 4D-MIP may contribute to improving the consistency of the ITV delineation.

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四维最大强度投影（4D-MIP）在不确定观察者间描绘的呼吸运动管理中的有效性。

本研究旨在评估四维（4D）最大强度投影（4D- mip）在弥补平均强度投影（AIP）在确定肺肿瘤内靶体积（ITV）方面的不足方面的应用。采用4D计算机断层扫描（4D- ct）对呼吸运动幻象伴模拟肿瘤进行成像。基于4D-CT的10个相位生成AIP和4D-MIP，然后对ITVAIP和itvip进行轮廓化；将其与10期4D-CT （ITV10）的ITV轮廓进行比较。此外，还获得了ITVAIP和itvvmip的剖面曲线，并测量了半最大全宽度（FWHM）。ITV10与itvip无显著性差异；然而，ITVAIP显示出较低的值。由于上下缘CT值降低，ITVAIP的FWHM值小于itvip。4D-MIP可能有助于提高ITV圈定的一致性。

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

Medical Dosimetry 医学-核医学

CiteScore

2.40

自引率

0.00%

发文量

审稿时长

34 days

期刊介绍： Medical Dosimetry, the official journal of the American Association of Medical Dosimetrists, is the key source of information on new developments for the medical dosimetrist. Practical and comprehensive in coverage, the journal features original contributions and review articles by medical dosimetrists, oncologists, physicists, and radiation therapy technologists on clinical applications and techniques of external beam, interstitial, intracavitary and intraluminal irradiation in cancer management. Articles dealing primarily with physics will be reviewed by a specially appointed team of experts in the field.