Positive susceptibility-based contrast imaging with dephased balanced steady-state free precession

IF 3 3区医学 Q2 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Magnetic Resonance in Medicine Pub Date : 2025-03-13 DOI:10.1002/mrm.30421

Jonas Frederik Faust, Peter Speier, Axel Joachim Krafft, Sunil Patil, Ravi Teja Seethamraju, Mark E. Ladd, Florian Maier

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引用次数: 0

Abstract

Purpose

Dephasing gradients can be introduced within a variety of gradient-echo pulse sequences to delineate local susceptibility changes (“White-Marker” phenomenon), e.g., for the visualization of metallic interventional devices which are otherwise difficult to display. We investigated dephased balanced steady-state free precession (d-bSSFP) and compared it with similar contrast techniques: dephased RF-spoiled fast low-angle shot (d-FLASH) and dephased steady-state free precession (d-SSFP).

Methods

A signal model was formulated to describe the positive contrast in d-bSSFP. For the example of an MR-compatible aspiration needle, the positive contrast artifact appearance was theoretically derived, and the model was verified in a water phantom at B₀ = 0.55 T. Model accuracy was evaluated by comparing the measured artifact size (for TEs between 3.4 ms and 50 ms) and the signal magnitude to the model prediction.

Results

While positive contrast artifacts for d-FLASH and d-SSFP are axisymmetric with respect to the generating object, for d-bSSFP, a point-symmetric susceptibility artifact arises for a cylindrical needle due to the characteristic signal formation. The observed d-bSSFP artifact size was in accordance with the model (error < 1 mm). Measured (predicted) cumulated artifact signal was 1.13 ± 0.07 (1.27) times higher and 5.9 ± 0.4 times higher than the d-SSFP and d-FLASH cumulated artifact signal, respectively. In contrast to d-SSFP, the d-bSSFP artifact was robust against banding artifacts.

Conclusion

d-bSSFP contrast is well described by the introduced model. Positive contrast artifacts show higher cumulated signal magnitude, symmetry, and homogeneity compared with d-FLASH and d-SSFP and can therefore improve device visualization and potentially device localization.

Abstract Image

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基于正极磁化率的对比成像与去相平衡稳态自由进动。

目的：可以在各种梯度回波脉冲序列中引入消相梯度来描绘局部磁化率变化（“白色标记”现象），例如，用于金属介入装置的可视化，否则难以显示。我们研究了去相平衡稳态自由进动（d-bSSFP），并将其与类似的对比技术进行了比较：去相rf破坏快速低角度拍摄（d-FLASH）和去相稳态自由进动（d-SSFP）。方法：建立一个信号模型来描述d-bSSFP阳性对比。以核磁共振兼容抽吸针为例，从理论上推导了正对比伪影外观，并在B0 = 0.55 T的水影中验证了该模型。通过比较测量的伪像大小（te在3.4 ms和50 ms之间）和信号大小来评估模型的准确性。结果：虽然d-FLASH和d-SSFP的阳性对比伪影相对于生成对象是轴对称的，但对于d-bSSFP，由于特征信号形成，对于圆柱形针会产生点对称的敏感性伪影。观察到的d-bSSFP伪影大小与模型一致（误差）。结论：所引入的模型很好地描述了d-bSSFP的对比度。与d-FLASH和d-SSFP相比，正对比伪影显示出更高的累积信号幅度、对称性和均匀性，因此可以改善设备的可视化和潜在的设备定位。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magnetic Resonance in Medicine 医学-核医学

CiteScore

6.70

自引率

24.20%

发文量

376

审稿时长

2-4 weeks

期刊介绍： Magnetic Resonance in Medicine (Magn Reson Med) is an international journal devoted to the publication of original investigations concerned with all aspects of the development and use of nuclear magnetic resonance and electron paramagnetic resonance techniques for medical applications. Reports of original investigations in the areas of mathematics, computing, engineering, physics, biophysics, chemistry, biochemistry, and physiology directly relevant to magnetic resonance will be accepted, as well as methodology-oriented clinical studies.