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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...

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Updated: Jun 3, 2025

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

联合k-b空间扩散权重图像重建和扩散权重旋回响成像的明显扩散系数适配.

Yan Dai¹, Xun Jia², Jiaen Liu³

¹Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.

Medical physics

|January 9, 2025

概括

一种新的联合k-b空间重建方法改善了扩散权重的旋回转回声MRI的信号噪声比和明显扩散系数的准确性. 这种技术提高了图像质量和定量测量,这对于临床应用至关重要,例如MRI导向放射治疗.

关键词:

拒绝使用,拒绝使用.扩散加权成像技术的使用.联合重建重建的重建优化的优化优化优化.定量的MRI是指MRI的数量.

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Last Updated: Jun 3, 2025

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

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Published on: December 15, 2014

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Published on: November 8, 2012

科学领域:

磁共振成像是一种磁共振成像技术.
医学物理医学物理
图像重建图像的重建

背景情况:

扩散加权 (DW) 旋回声 (TSE) MRI提供比回声平面成像 (EPI) 更好的几何精度.
由于DW-TSE的信号噪声比 (SNR) 低,以及采集时间长,这限制了其临床应用.
目前的限制限制了诊断和MRI导向放射治疗 (MRgRT) 的应用.

研究的目的:

为DW-TSE开发一个联合的k-b空间重建算法.
同时重建DW-TSE图像和表面扩散系数 (ADC) 地图.
为了提高ADC测量的图像质量和定量准确性.

主要方法:

制定了一个联合k-b重建作为一个优化问题与自我一致性条件.
集成的数据忠实性和空间规范化术语,使用交替方向乘法 (ADMM) 解决.
在幻影和患者研究中评估性能,与传统方法和DW-EPI进行比较.

主要成果:

联合重建 (JR) 方法提高了DW-TSE中的SNR和ADC测量精度.
平均值较少的JR-DW-TSE显示出比传统方法更好的图像质量.
证明了ADC测量的增强精度和可重复性.

结论:

拟议的联合k-b重建方法提高了DW-TSE质量和ADC准确性.
这种技术为临床使用提供了扭曲强度扩散权重MRI (DWI).
对于MRgRT等应用至关重要.