接收线圈质量保证程序和ViewRay MRIdian MR-Linac的自动化分析
Evangelia Kaza1, Christopher L Williams1
1Radiation Oncology, Brigham and Women's Hospital, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts, USA.
Journal of applied clinical medical physics
|January 17, 2024
概括
这项研究开发了一种用于MRIdian Linac线圈质量保证 (QA) 的多切片幻影成像方法. 自动化分析显著降低了可变性,并改善了线圈故障的检测,确保了一致的图像质量.
科学领域:
- 医疗成像医学成像
- 磁共振成像 (MRI) 是一种磁共振成像技术.
- 质量保证 质量保证 质量保证
背景情况:
- 定期质量保证 (QA) 对于保持MRIdian Linac系统图像质量至关重要.
- 目前,制造商提供的信号噪声比 (SNR) 和统一性评估方法仅限于单片分析.
- 现有的质量保证协议可能会因扫描间的变化而受到影响,需要人工分析.
研究的目的:
- 通过实施一个稳定的幻影的多切片成像来增强MRIdian Linac线圈QA.
- 消除扫描间的变化,改善成像设置和覆盖范围.
- 通过开发客观的,自动化的分析软件来加快分析.
主要方法:
- 一个圆柱形塑料瓶幻影被扫描使用一个旋转回声序列与18个轴切片.
- 采集是使用和不使用预扫描正常化过进行的,保存未结合的元素图像.
- 开发了自定义的MATLAB代码,用于自动化ROI定义,SNR和统一性计算,根据基线比较做出通过/失败决定.
主要成果:
- 多切片质量保证方法成功实施了3.5年,设置和扫描平均需要41分钟.
- 自动图像分析只需要几分钟,大大缩短了分析时间.
- 该方法确定了线圈元件位置,信号/噪声响应和SNR,有效检测线圈故障并提供通过/失败值.
结论:
- 开发的质量保证方法消除了MRIdian Linac线圈评估中的观察者偏见.
- 它为线圈功能,图像过和元素位置提供了宝贵的见解.
- 该方法确定了客观的SNR和统一性值,并成功识别了故障的线圈元件.
相关概念视频
01:24Magnetic Resonance Imaging
5.2K
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
5.2K
01:14Node Analysis for AC Circuits
321
Consider an angioplasty system featuring a catheter equipped with a turbine, a critical tool for removing plaque deposits from coronary arteries. This intricate medical device operates using a circuit model reminiscent of a dual-node RLC circuit powered by a current-controlled voltage source.
To unravel the complexities of this system, nodal analysis is employed, a powerful technique founded on Kirchhoff's current law (KCL), which remains valid for phasors. AC circuits can effectively be...
To unravel the complexities of this system, nodal analysis is employed, a powerful technique founded on Kirchhoff's current law (KCL), which remains valid for phasors. AC circuits can effectively be...
321
01:30Radiological Investigation II: MRI and Ventilation Perfusion Scan
122
Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
122