相关实验视频

Updated: Jun 7, 2025

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

Published on: February 19, 2021

可变翻转角度的3D螺旋进出轮旋转回声成像使用同时发生的梯度补偿和回声重新排序在0.55 T

Zhixing Wang^1,2, Rajiv Ramasawmy³, Ahsan Javed³

¹Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia, USA.

Magnetic resonance in medicine

|November 20, 2024

概括

这项研究引入了一种新的3D螺旋空间MRI技术,用于高效的全脑成像. 这种新方法显著改善了信号噪声比 (SNR) 并减少了与传统卡特西安空间成像相比的工件.

科学领域:

磁共振成像 (MRI) 是一种磁共振成像技术.
医学成像物理医学成像物理

背景情况:

传统的MRI技术可能受扫描时间和图像质量限制.
开发高效和高分辨率的成像方法对于临床诊断至关重要.

研究的目的:

开发一个单片3D螺旋轮回旋回声 (螺旋 SPACE) 技术,用于1毫米3的同otropic全脑T2加权成像.
为了提高扫描效率,在0.55T扫描仪上使用交叉螺旋进出轨迹,可变翻转角度射频 (RF) 脉冲,回声重新排序和同时场补偿.

主要方法:

实现了一堆螺旋 (进出波形) 旋旋回声采集与T2加权对比度.
应用梯度冲动响应函数 (GIRF) 进行梯度不忠度校正和相位错误校正的同时场补偿.
利用可变翻转角的射频脉冲和回声重新排序来维持长回声列车并确保平稳的信号变化.

主要成果:

幻影研究证实,随着同时进行场校正和基于GIRF的轨迹估计,性能得到了改善.
志愿者数据显示,通过校正技术,在螺旋空间中,人工物和模糊的显著缓解.
与卡特西亚空间相比,螺旋空间在白色和灰色物质中实现了15% - 25%的信号噪声比 (SNR) 改进.

结论:

在0.55T.成功地演示了3D螺旋式进出SPACE获取.
该技术包括可变翻转角度,同时场补偿和回声重新排序,以改善成像.
螺旋空间显示与卡特西亚空间相比有希望的SNR增长,提供更高效和有效的成像解决方案.

关键词:

3D轮旋转回声成像 3D轮旋转回声成像同时发生的梯度场.低场扫描仪低场扫描仪螺旋成像技术的使用

更多相关视频

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Published on: December 18, 2016

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

Published on: December 15, 2014

相关概念视频

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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...