利用三维定量参数图同时进行动脉和静脉成像。

IF 2.5 3区 医学 Q2 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Magnetic Resonance in Medical Sciences Pub Date : 2024-01-01 Epub Date: 2022-12-21 DOI:10.2463/mrms.mp.2021-0170
Tomoki Amemiya, Suguru Yokosawa, Yo Taniguchi, Ryota Sato, Yoshihisa Soutome, Hisaaki Ochi, Toru Shirai
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引用次数: 0

摘要

目的:为了增加磁共振检查中使用定量参数获取图像的数量,我们开发了一种方法,通过计算获取质子密度(PD)、射频不均匀性(B1)、纵向弛豫时间(T1)、表观横向弛豫时间(T2*)和磁感应强度的动脉和静脉图像,所有这些都具有相同的空间分辨率:方法:所提出的方法使用部分射频溢出梯度回波序列来获得具有多种扫描参数的受试者三维图像。使用我们之前开发的量化方法估算 PD、B1、T1、T2* 和磁感应强度图。使用优化权重添加图像以突出动脉,从而获得动脉图像。使用形态滤波器从磁感图中获取静脉图像。为了进行评估,我们使用了五名健康志愿者中四名的图像来优化动脉图像计算中使用的权重,并将优化后的权重应用到第五名志愿者的图像中以获得动脉图像。五名志愿者的动脉图像均采用留空法进行计算,使用参考飞行时间(TOF)法确定的动脉区域与背景区域的对比度则使用接收者操作特征曲线下面积(AUC)进行评估。对于静脉图像,还评估了参考定量易感性映射(QSM)方法定义的静脉区域与背景区域之间的对比度:结果:使用所提出的方法区分血管和背景的 AUC 值,动脉图像为 0.905,静脉图像为 0.920:结果表明,参考 TOF 和 QSM 方法确定的动脉图像和静脉图像在同一区域具有较高的信号强度,这表明可以通过综合计算获得具有定量参数映射的血管图像。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Simultaneous Arterial and Venous Imaging Using 3D Quantitative Parameter Mapping.

Purpose: To increase the number of images that can be acquired in MR examinations using quantitative parameters, we developed a method for obtaining arterial and venous images with mapping of proton density (PD), RF inhomogeneity (B1), longitudinal relaxation time (T1), apparent transverse relaxation time (T2*), and magnetic susceptibility through calculation, all with the same spatial resolution.

Methods: The proposed method uses partially RF-spoiled gradient echo sequences to obtain 3D images of a subject with multiple scan parameters. The PD, B1, T1, T2*, and magnetic susceptibility maps are estimated using the quantification method we previously developed. Arterial images are obtained by adding images using optimized weights to emphasize the arteries. A morphology filter is used to obtain venous images from the magnetic susceptibility maps. For evaluation, images obtained from four out of five healthy volunteers were used to optimize the weights used in the arterial-image calculation, and the optimized weights were applied to the images from the fifth volunteer to obtain an arterial image. Arterial images of the five volunteers were calculated using the leave-one-out method, and the contrast between the arterial and background regions defined using the reference time-of-flight (TOF) method was evaluated using the area under the receiver operation characteristic curve (AUC). The contrast between venous and background regions defined by a reference quantitative susceptibility mapping (QSM) method was also evaluated for the venous image.

Results: The AUC to discriminate blood vessels and background using the proposed method was 0.905 for the arterial image and 0.920 for the venous image.

Conclusion: The results indicate that the arterial images and venous images have high signal intensity at the same region as determined from the reference TOF and QSM methods, demonstrating the possibility of acquiring vasculature images with quantitative parameter mapping through calculation in an integrated manner.

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来源期刊
Magnetic Resonance in Medical Sciences
Magnetic Resonance in Medical Sciences RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
5.80
自引率
20.00%
发文量
71
审稿时长
>12 weeks
期刊介绍: Magnetic Resonance in Medical Sciences (MRMS or Magn Reson Med Sci) is an international journal pursuing the publication of original articles contributing to the progress of magnetic resonance in the field of biomedical sciences including technical developments and clinical applications. MRMS is an official journal of the Japanese Society for Magnetic Resonance in Medicine (JSMRM).
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