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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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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...

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Whole-body PET/MRI of Pediatric Patients: The Details That Matter
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An MRI-based Attenuation Correction Method for Combined PET/MRI Applications.

Baowei Fei1, Xiaofeng Yang, Hesheng Wang

  • 1Departments of Radiology, Emory University, Atlanta, GA. Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio.

Proceedings of Spie--The International Society for Optical Engineering
|May 18, 2013
PubMed
Summary

We developed a new MRI-based method for attenuation correction in PET/MRI scans. This technique improves the accuracy of PET imaging by using MRI data to correct for attenuation, enhancing quantitative analysis for disease research.

Keywords:
MRIPETattenuation correctionbrain imagingclassificationregistrationsegmentation

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Area of Science:

  • Medical Imaging
  • Radiological Physics
  • Biomedical Engineering

Background:

  • Positron Emission Tomography (PET) offers high sensitivity but lacks anatomical detail.
  • Magnetic Resonance Imaging (MRI) provides excellent high-resolution anatomical and soft-tissue contrast.
  • Combined PET/MRI offers comprehensive metabolic, functional, and anatomical insights for disease research.

Purpose of the Study:

  • To develop and validate an MRI-based method for accurate attenuation correction in combined PET/MRI systems.
  • To address the lack of direct attenuation measurement in current hybrid PET/MRI scanners.
  • To improve the quantitative accuracy of PET data by leveraging anatomical information from MRI.

Main Methods:

  • Developed a combined image registration, classification, and attenuation correction scheme.
  • Utilized automatic registration to align MR and preliminary PET data.
  • Employed multiscale fuzzy C-mean classification to segment MRI into tissue types.
  • Assigned theoretical attenuation coefficients to classified tissues to generate attenuation maps.
  • Reconstructed corrected PET data using 3D Filtered Back Projection and Ordered Subset Expectation Maximization.

Main Results:

  • The proposed MRI-based attenuation correction method demonstrated improved PET data quantitation.
  • Simulated and phantom data validated the effectiveness of the approach.
  • The method is particularly beneficial for quantitative analysis in combined PET/MRI applications.

Conclusions:

  • MRI-based attenuation correction is a viable solution for hybrid PET/MRI systems lacking transmission scans.
  • This method enhances the accuracy and reliability of quantitative PET imaging.
  • The developed technique holds significant promise for advancing disease mechanism studies using combined PET/MRI.