相关实验视频

Updated: Jun 18, 2025

Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques

Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques

Published on: June 11, 2019

可变密度速度选择性磁化制剂用于非对比增强的外围MR血管学

Minyoung Kim^1,2, Inpyeong Hwang^3,4, Seung Hong Choi^3,4

¹Department of Mechanical and Biomedical Engineering, Ewha Womans University, Seoul, Republic of Korea.

Physical and engineering sciences in medicine

|July 30, 2024

概括

这项研究引入了一种新的可变密度速度选择性 (VS) 准备脉冲序列,用于非对比增强磁共振血管学 (NCE-MRA). 这种新方法有效地减少了动脉中的信号损失,改善了图像质量,以获得更好的可视化.

科学领域:

磁共振成像技术磁共振成像技术
医学成像物理医学成像物理
心血管成像 - 心血管成像

背景情况:

速度选择性 (VS) 磁化准备是非对比增强磁共振血管造影 (NCE-MRA) 的一个有前途的技术.
传统的VS-MRA方法遭受着假名和,导致动脉中的信号损失.
这种与速度视野 (vFOV) 相关的信号损失可能会损害诊断的准确性.

研究的目的:

开发一个改进的VS准备脉冲序列,以克服NCE-MRA中的和问题.
与现有的VS-MRA技术相比,增强动脉信号并减少信号损失.
优化k空间采样,以提高速度编码和信号统一性.

主要方法:

开发了一种新的VS准备序列,使用非均的k空间采样.
采用可变密度采样策略,通过速度扩散别名激发.
优化了采样功能,以最大限度地提高速度传输带中的信号,并最大限度地降低差异.
在健康人群中使用Bloch模拟和in-vivo外围NCE-MRA验证了该方法.

主要成果:

与传统方法相比,拟议的变频密度VS-MRA显著减少了动脉信号损失.
显示了较高的动脉信号与噪声比率 (58.50 ± 14.29 与 55.54 ± 12.32; p < 0.05).
实现了动脉与背景对比度与噪声比率的改善 (22.75 ± 7.57 与 20.60 ± 6.51 相比; p < 0.05).

结论:

这种新型变频密度VS制剂有效地减轻了NCE-MRA中的别名和.
这种技术通过保留动脉信号来提供卓越的图像质量.
优化的序列具有增强非对比血管学应用的潜力.

关键词:

磁化制备剂磁化制备剂无对比增强磁共振血管学射频脉冲设计的设计速度选择性激发速度选择性激发

更多相关视频

Retrograde Perfusion and Filling of Mouse Coronary Vasculature as Preparation for Micro Computed Tomography Imaging

Retrograde Perfusion and Filling of Mouse Coronary Vasculature as Preparation for Micro Computed Tomography Imaging

Published on: February 10, 2012

Preparation and In Vitro Characterization of Magnetized miR-modified Endothelial Cells

Preparation and In Vitro Characterization of Magnetized miR-modified Endothelial Cells

Published on: May 2, 2017

相关概念视频

Magnetic Resonance Imaging

Magnetic Resonance Imaging

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...

Imaging Studies I: CT and MRI

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...