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Related Concept Videos

Magnetic Resonance Imaging01:24

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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Related Experiment Video

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High-resolution In Vivo Manual Segmentation Protocol for Human Hippocampal Subfields Using 3T Magnetic Resonance Imaging
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High-resolution In Vivo Manual Segmentation Protocol for Human Hippocampal Subfields Using 3T Magnetic Resonance Imaging

Published on: November 10, 2015

In vivo quantification of hippocampal subfields using 4.7 T fast spin echo imaging.

N V Malykhin1, R M Lebel, N J Coupland

  • 1Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada. nikolai@ualberta.ca

Neuroimage
|September 30, 2009
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Summary
This summary is machine-generated.

This study precisely measured hippocampal subfields in healthy adults using high-resolution MRI. Findings reveal distinct subfield distributions along the hippocampus, crucial for understanding neuropsychiatric disorders.

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Area of Science:

  • Neuroimaging
  • Neuroanatomy
  • Neuroscience

Background:

  • Neuropsychiatric disorders often involve hippocampal structural changes.
  • Previous volumetric magnetic resonance imaging (MRI) studies primarily measured total hippocampal volume.
  • A detailed understanding of hippocampal subfield distribution is lacking.

Purpose of the Study:

  • To delineate and measure hippocampal subfields within the whole hippocampus.
  • To analyze subfield volumes along the hippocampus's longitudinal axis.
  • To establish normative data for subfield distribution in healthy subjects.

Main Methods:

  • High-resolution MRI (4.7 T) was used in 11 healthy subjects.
  • A fast spin echo (FSE) sequence provided native resolution of 0.52 x 0.68 x 1.0 mm³.
  • Manual tracing of subiculum, cornu ammonis (CA1-3), and dentate gyrus was performed in hippocampal head, body, and tail.

Main Results:

  • Significant differences in the distribution of subfields (dentate gyrus, CA1-3, subiculum) along the longitudinal axis were observed.
  • The dentate gyrus was largest in the hippocampal body; CA1-3 was largest in the head; the subiculum was smallest in the tail.
  • Subfield volumes were consistent between hemispheres and aligned with histological data.

Conclusions:

  • Direct measurements of hippocampal subfield distribution are more sensitive for detecting disease effects than total volume.
  • The differential distribution of subfield volumes aids in interpreting lower-resolution MRI data.
  • This detailed subfield mapping provides a foundation for future clinical research in neuropsychiatric disorders.