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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

Updated: May 21, 2026

MRI and PET in Mouse Models of Myocardial Infarction
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MRI and PET in Mouse Models of Myocardial Infarction

Published on: December 19, 2013

MRI-based nonrigid motion correction in simultaneous PET/MRI.

Se Young Chun1, Timothy G Reese, Jinsong Ouyang

  • 1Center for Advanced Radiological Sciences, Nuclear Medicine and Molecular Imaging, Radiology Department, Massachusetts General Hospital, Boston, MA 02114, USA.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|June 30, 2012
PubMed
Summary
This summary is machine-generated.

Simultaneous PET/MRI with tagged MRI motion correction significantly enhances lesion detection and image quality in whole-body scans. This novel approach overcomes limitations of standard gating, offering improved signal-to-noise ratio and reduced radiation dose.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Biomedical Engineering

Background:

  • Respiratory and cardiac motion severely degrade whole-body PET spatial resolution and introduce artifacts.
  • Current gating techniques can reduce motion artifacts but increase image noise.

Purpose of the Study:

  • To develop and evaluate a novel respiratory motion correction method for simultaneous PET/MRI.
  • To assess the impact of this correction on image quality and lesion detectability.

Main Methods:

  • Simultaneous PET/MRI was used in phantoms, rabbits, and nonhuman primates.
  • Motion fields were derived from tagged MR images using B-spline registration.
  • A PET list-mode OSEM algorithm incorporated motion data for reconstruction.

Main Results:

  • MRI-based motion correction eliminated motion blur without SNR reduction, achieving gating-comparable SNR with shorter acquisition times.
  • Lesion detection SNR improved significantly (166%-276%) compared to gating in phantom studies.
  • In vivo studies in rabbits confirmed these improvements in PET image quality.

Conclusions:

  • Tagged MRI motion correction in simultaneous PET/MRI substantially improves lesion detection over gating and uncorrected methods.
  • This technique reduces radiation dose and enhances PET image quality, supporting clinical evaluation.