Partial Fourier in the presence of respiratory motion in prostate diffusion-weighted echo planar imaging.

IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Magnetic Resonance Materials in Physics, Biology and Medicine Pub Date : 2024-08-01 Epub Date: 2024-05-14 DOI:10.1007/s10334-024-01162-x
Sean McTavish, Anh T Van, Johannes M Peeters, Kilian Weiss, Felix N Harder, Marcus R Makowski, Rickmer F Braren, Dimitrios C Karampinos
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Abstract

Purpose: To investigate the effect of respiratory motion in terms of signal loss in prostate diffusion-weighted imaging (DWI), and to evaluate the usage of partial Fourier in a free-breathing protocol in a clinically relevant b-value range using both single-shot and multi-shot acquisitions.

Methods: A controlled breathing DWI acquisition was first employed at 3 T to measure signal loss from deep breathing patterns. Single-shot and multi-shot (2-shot) acquisitions without partial Fourier (no pF) and with partial Fourier (pF) factors of 0.75 and 0.65 were employed in a free-breathing protocol. The apparent SNR and ADC values were evaluated in 10 healthy subjects to measure if low pF factors caused low apparent SNR or overestimated ADC.

Results: Controlled breathing experiments showed a difference in signal coefficient of variation between shallow and deep breathing. In free-breathing single-shot acquisitions, the pF 0.65 scan showed a significantly (p < 0.05) higher apparent SNR than pF 0.75 and no pF in the peripheral zone (PZ) of the prostate. In the multi-shot acquisitions in the PZ, pF 0.75 had a significantly higher apparent SNR than 0.65 pF and no pF. The single-shot pF 0.65 scan had a significantly lower ADC than single-shot no pF.

Conclusion: Deep breathing patterns can cause intravoxel dephasing in prostate DWI. For single-shot acquisitions at a b-value of 800 s/mm2, any potential risks of motion-related artefacts at low pF factors (pF 0.65) were outweighed by the increase in signal from a lower TE, as shown by the increase in apparent SNR. In multi-shot acquisitions however, the minimum pF factor should be larger, as shown by the lower apparent SNR at low pF factors.

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前列腺扩散加权回波平面成像中存在呼吸运动时的部分傅里叶。
目的:研究呼吸运动对前列腺弥散加权成像(DWI)信号损失的影响,并评估在临床相关的 b 值范围内使用单次和多次采集的自由呼吸方案中部分傅立叶的使用情况:方法:首先在 3 T 下进行受控呼吸 DWI 采集,测量深呼吸模式造成的信号损失。在自由呼吸方案中,采用了无部分傅立叶(无 pF)和部分傅立叶(pF)系数为 0.75 和 0.65 的单发和多发(2 发)采集。对 10 名健康受试者的表观信噪比和 ADC 值进行了评估,以确定低 pF 因子是否会导致低表观信噪比或高估 ADC:结果:控制呼吸实验显示,浅呼吸和深呼吸的信号变异系数存在差异。在自由呼吸的单次采集中,pF 为 0.65 的扫描显示出明显的差异(p 结论:深呼吸模式会导致体内毒物浓度升高:深呼吸模式会导致前列腺 DWI 中的体素内失相。在 b 值为 800 s/mm2 的单次采集中,低 pF 因子(pF 0.65)下与运动相关的伪影的潜在风险被较低 TE 带来的信号增加所抵消,这体现在表观 SNR 的增加上。然而,在多拍采集中,最小 pF 因子应该更大,这一点从低 pF 因子时较低的表观 SNR 可以看出。
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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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