Field camera input to virtual phantom (ViP) scanner acquisitions for quality assurance of derived MRI quantities: first implementation and proof-of-principle.

IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Magnetic Resonance Materials in Physics, Biology and Medicine Pub Date : 2024-04-01 Epub Date: 2023-12-21 DOI:10.1007/s10334-023-01136-5
Peter David Gatehouse, Gabriella Captur, Sonia Nielles-Vallespin, Dudley John Pennell
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Abstract

Introduction: Quality assurance (QA) of measurements derived from MRI can require complicated test phantoms. This work introduces a new QA concept using gradient and transmit RF recordings by a limited field camera (FC) to govern the previous Virtual Phantom (ViP) method. The purpose is to describe the first technical implementation of combined FC+ViP, and illustrate its performance in examples, including quantitative first-pass myocardial perfusion.

Materials and methods: The new QA concept starts with a synthetic test object (STO) representing some arbitrary test input. Using recordings of the unmodified standard sequence by a gradient and RF waveform camera (FC), ViP calculates by Bloch simulation the continuous RF signal emitted by the STO during this sequence (hence FC+ViP). During nominally identical repetition of the sequence acquisition, ViP transmits the RF signal for scanner reception, reconstruction and any further parametric derivations by the unmodified standard scanner image reconstruction and analysis software.

Results: The scanner outputs were compared against the input STOs.

Conclusion: First proof-of-principle was discussed and supported by correlation between scanner outputs and the input STO. The work makes no claim that its examples are valid QA methods. It concludes by proposing a new industrial standard for QA without the FC.

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虚拟模型(ViP)扫描仪采集的现场照相机输入,用于保证衍生磁共振成像数量的质量:首次实施和原理验证。
简介:磁共振成像测量的质量保证(QA)需要复杂的测试模型:磁共振成像测量的质量保证(QA)需要复杂的测试模型。这项研究引入了一种新的质量保证概念,即利用有限场相机(FC)的梯度和发射射频记录来控制以前的虚拟模型(ViP)方法。其目的是描述 FC+ViP 组合的首次技术实施,并在实例中说明其性能,包括定量的第一通道心肌灌注:新的质量保证概念从代表任意测试输入的合成测试对象(STO)开始。利用梯度和射频波形照相机(FC)记录未经修改的标准序列,ViP 通过布洛赫模拟计算出 STO 在此序列中发出的连续射频信号(因此称为 FC+ViP)。在名义上完全相同的重复序列采集过程中,ViP 将射频信号发送给扫描仪接收、重建,并通过未修改的标准扫描仪图像重建和分析软件进行进一步的参数推导:结果:将扫描仪的输出与输入的 STO 进行了比较:通过扫描仪输出与输入 STO 之间的相关性,讨论并支持了第一个原理证明。这项工作并未声称其示例是有效的质量保证方法。最后,它提出了一种不使用 FC 的质量保证新工业标准。
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来源期刊
CiteScore
4.60
自引率
0.00%
发文量
58
审稿时长
>12 weeks
期刊介绍: MAGMA is a multidisciplinary international journal devoted to the publication of articles on all aspects of magnetic resonance techniques and their applications in medicine and biology. MAGMA currently publishes research papers, reviews, letters to the editor, and commentaries, six times a year. The subject areas covered by MAGMA include: advances in materials, hardware and software in magnetic resonance technology, new developments and results in research and practical applications of magnetic resonance imaging and spectroscopy related to biology and medicine, study of animal models and intact cells using magnetic resonance, reports of clinical trials on humans and clinical validation of magnetic resonance protocols.
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