Development of a rotation phantom for phase contrast MRI sequence validation and quality control.
Development of a rotation phantom for phase contrast MRI sequence validation and quality control.
复制标题
开发用于相差 MRI 序列验证和质量控制的旋转体模。
DOI：
10.1002/mrm.28343
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发表时间：
2020
影响因子：
3.3
通讯作者：
Schnell,Susanne
中科院分区：
文献类型：
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作者：
Vali,Alireza;Schmitter,Sebastian;Ma,Liliana;Flassbeck,Sebastian;Schmidt,Simon;Markl,Michael;Schnell,Susanne
目的建立一种可靠、一致、可重复的参考体模，用于相位对比MRI的误差量化，以便用于验证和质量控制。方法研制了一种空气驱动旋转体模，该体模由一个稳定旋转的圆柱体和一个静止环组成，圆柱体周围填充琼脂糖凝胶。使用光学计数器和闭环控制器对转速进行真实的实时测量和控制。通过记录旋转速度的变化来评估体模的一致性。使用2D相位对比MRI对体模进行成像，并将每个点的速度与分析预测的速度进行比较。此外，为了检查再现性，该模型在2个不同的日子以相同的旋转速度运行，并使用相同的相位对比MRI protocol.ResultsThe旋转模型提供了一致的旋转速度与2转每分钟SD从设定值为20分钟。预测和测量速度之间的比较表现出良好的一致性（组内相关系数为0.99）。速度分量的均方根误差小于最大值的1%。扫描再扫描实验表明，该模型可以重现相同的速度分布（组内相关系数为0.99），使用相同的旋转速度和MRI settings.ConclusionThe开发的旋转模型提供了良好定义和可重复的线性速度分布，可用于系统和定量的误差分析相衬MRI的一系列已知的速度。
PurposeTo develop a reliable, consistent, and reproducible reference phantom for error quantification of phase‐contrast MRI so it can be used for validation and quality control.MethodsAn air‐driven rotation phantom consisting of a steadily rotating cylinder surrounded by a static ring both filled with agarose gel was developed. Rotational speed was measured and controlled in real time using an optical counter and a closed‐loop controller. Consistency of the phantom was assessed by recording variations in rotational speed. The phantom was imaged with 2D phase‐contrast MRI, and the velocity at each point was compared with analytically predicted velocity. Additionally, to examine reproducibility, the phantom was run with the same rotational speed on 2 different days and imaged using the same phase‐contrast MRI protocol.ResultsThe rotation phantom provided consistent rotational speed with 2 revolutions per minute SD from the set value for 20 min. Comparison between predicted and measured velocities demonstrated excellent agreement (intraclass correlation coefficient of 0.99). The RMS error in velocity components were less than 1% of maximum value. The scan–rescan experiment showed that the phantom can reproduce the same velocity distributions (intraclass correlation coefficient of 0.99) using the same rotational speed and MRI settings.ConclusionThe developed rotation phantom provided well‐defined and reproducible linear velocity distributions, which can be used for systematic and quantitative error analysis of phase‐contrast MRI for a range of known velocities.