双能CT技术用于剂量学的拟人躯干模型的材料组成和衰减特性分析。

IF 2.4 4区 医学 Q3 ENGINEERING, BIOMEDICAL
Koji Ono, Yasuki Asada
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引用次数: 0

摘要

拟人幻影常用于估计器官吸收剂量。然而,这些幻影的材料组成与人体并不相同,这可能会导致测量结果的误差。本研究的目的是利用双能计算机断层扫描(DECT)分析几种拟人躯干模型的材料组成,并阐明不同拟人躯干模型在衰减特性上的差异。使用DECT扫描来自不同制造商的人形躯干模型(ATOM、RANDO和PBU-60)。靶器官为肺、软组织、肝脏、骨骼和骨表面,根据能量与CT值的关系,建立光谱Hounsfield单位曲线(HU曲线)。根据国际辐射单位和测量委员会报告44提出的质量衰减系数和密度(理想值)估计理想CT值,并与每个幻像的值进行比较。软组织、肝脏和骨骼的衰减特征差异较大。45 keV时,软组织的理想值、ATOM值、RANDO值和PBU-60值分别为59.82、14.17、34.22和- 70.11;和53.13,24.41,3.97和- 5.75在70 keV。根据能量的不同,最接近理想值的幻像可能会有所不同。HU曲线和CT值的差异说明幻体内某些器官对人体组织具有不同的材料组成和衰减特性。当可用于剂量测定的模体有限时,了解所使用的每个模体的衰减特性是很重要的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of material composition and attenuation characteristics of anthropomorphic torso phantoms for dosimetry using dual energy CT technology.

Anthropomorphic phantoms are often used to estimate organ absorbed doses. However, the material composition of these phantoms is not identical to that of the human body, which may cause errors in the measurement results. The purpose of this study was to analyze the material composition of several anthropomorphic torso phantoms using dual energy computed tomography (DECT), and to clarify the differences in attenuation characteristics among the phantoms. Anthropomorphic torso phantoms (ATOM, RANDO, and PBU-60) from different manufacturers were scanned with DECT. The target organs were lung, soft tissue, liver, bone, and bone surface, and a spectral Hounsfield unit curve (HU curve) was created from the relationship between energy and CT values. Ideal CT values were estimated from the mass attenuation coefficient and density proposed by the International Commission on Radiation Units and Measurements report 44 (ideal value) and compared with the values of each phantom. There were large differences in attenuation characteristics among the phantoms for soft tissue, liver, and bone. The respective ideal, ATOM, RANDO, and PBU-60 CT values of soft tissue were 59.82, 14.17, 34.22, and - 70.11 at 45 keV; and 53.13, 24.41, 3.97, and - 5.75 at 70 keV. The phantom closest to the ideal value may differ depending on the energy. Differences in HU curve and CT values indicate that some organs in the phantom have different material composition and attenuation characteristics to human tissues. When the phantoms available for dosimetry are limited, it is important to understand the attenuation characteristics of each phantom used.

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CiteScore
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