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Magnetic Resonance Imaging01:24

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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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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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Volumetric q-space imaging by 3D diffusion-weighted MRI.

Keigo Hikishima1, Kazuo Yagi, Tomokazu Numano

  • 1Biomedical Sensing and Imaging Group, National Institute of Advanced Industrial, Science and Technology (AIST), AIST Tsukuba East, Tsukuba 305-8564, Ibaraki, Japan. k-hikishima@ciea.or.jp

Magnetic Resonance Imaging
|December 11, 2007
PubMed
Summary

High b-value diffusion MRI with q-space analysis reveals microstructural details. Three-dimensional MRI improves resolution and reduces artifacts for more reliable analysis of small tissue architectures in vivo.

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Area of Science:

  • Biomedical Imaging
  • Neuroimaging
  • Radiology

Background:

  • High b-value diffusion magnetic resonance imaging (MRI) and q-space analysis offer superior resolution for detecting microstructural changes.
  • Conventional 2D diffusion-weighted imaging (DWI) is limited by partial-volume effects due to slice thickness and gaps.
  • Average displacement, a q-space parameter, quantifies microstructure size and detects in vivo changes relevant to neurodegeneration and tumors.

Purpose of the Study:

  • To develop and implement a high b-value 3D DWI sequence for enhanced q-space analysis.
  • To evaluate the reliability of high b-value 3D DWI in conjunction with q-space analysis.
  • To generate high-resolution, isotropic microscopic analytical maps with reduced artifacts.

Main Methods:

  • Development and implementation of a novel high b-value 3D DWI sequence.
  • Application of q-space analysis to data acquired using the 3D DWI sequence.
  • Acquisition of volumetric data in small isotropic voxels for improved spatial resolution.

Main Results:

  • Successful implementation of a high b-value 3D DWI sequence.
  • Demonstrated reliability of high b-value 3D DWI for q-space analysis.
  • Generation of microscopic analytical maps with isotropic high resolution and minimized contamination.

Conclusions:

  • High b-value 3D DWI combined with q-space analysis provides reliable, high-resolution microstructural information.
  • This technique overcomes limitations of 2D DWI, offering improved detection of subtle tissue changes.
  • The developed method enables advanced in vivo microstructural evaluation for various medical applications.