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Computed Tomography

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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相关实验视频

Updated: May 26, 2025

Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

Published on: November 23, 2019

评估无文物四维计算机断层扫描与16厘米探测器阵列阵列.

Inhwan Yeo¹, Wei Nie¹, Jiajin Fan¹

¹Department of Advanced Radiation and Proton Therapy, INOVA Schar Cancer Institute, Fairfax, Virginia, USA.

Journal of applied clinical medical physics

|February 24, 2025

概括

此摘要是机器生成的。

与4厘米阵列系统相比,16厘米阵列轴向四维计算机断层扫描 (4DCT) 系统在不规则呼吸期间成像肺瘤方面表现出更高的准确性. 这种4DCT成像对于精确的放射治疗计划至关重要.

关键词:

16厘米长的探测器 4DCT 4DCT是4DCT的直播方式.文物文物文物呼吸不规则呼吸不规则

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Last Updated: May 26, 2025

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科学领域:

医疗成像医学成像
辐射瘤学辐射瘤学
计算机断层扫描 (CT) 是一种计算机断层扫描.

背景情况:

在放射治疗期间精确的肺瘤成像是至关重要的.
呼吸诱导的运动可以显著影响图像质量和处理精度.
四维计算机断层扫描 (4DCT) 用于解释呼吸运动.

研究的目的:

为了比较16厘米阵列轴向4DCT系统与4厘米阵列系统的性能.
为了评估它们在存在不规则的呼吸模式时的有效性.
在动态幻影研究中评估肺瘤向图像准确性.

主要方法:

一个带有球形目标的幻影肺气经受到了模拟CyberKnife治疗场景的10个运动痕迹.
在模拟不规则呼吸的情况下,使用16厘米阵列和4厘米阵列4DCT系统获得图像.
目标尺寸,重叠比率和霍恩斯菲尔德单位与一步一步的螺旋扫描地面真相进行了比较.

主要成果:

与4厘米阵列相比,16厘米阵列的4DCT在目标长度和重叠比率方面与地面真相更好地一致.
4厘米阵列4DCT表现出显著的分歧,特别是在最大强度投影 (MipCT) 和相位 (MP) CT重建中.
虽然16厘米阵列4DCT提高了准确性,但运动平均和相位排序的限制影响了完美的重建.

结论:

建议使用16厘米阵列轴向4DCT系统,以减轻肺瘤成像中呼吸系统不规则的影响.
使用16厘米阵列的4DCT可以提高肺癌患者放射治疗计划的精度.