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Related Concept Videos

Positron Emission Tomography01:29

Positron Emission Tomography

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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PET/MR imaging: technical aspects and potential clinical applications.

Drew A Torigian1, Habib Zaidi, Thomas C Kwee

  • 1Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce St, Philadelphia, PA 19104-4283, USA. Drew.Torigian@uphs.upenn.edu

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Combined positron emission tomography (PET) and magnetic resonance (MR) imaging instruments offer superior diagnostic performance over PET/computed tomography (CT). This advanced imaging modality provides enhanced soft-tissue contrast, functional imaging, and reduced radiation exposure for improved patient care.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Nuclear Medicine

Background:

  • Combined PET/MR systems are emerging as advanced diagnostic tools.
  • MR imaging offers superior soft-tissue contrast, multiplanar acquisition, and functional imaging capabilities compared to CT.
  • The absence of ionizing radiation in MR imaging is beneficial for specific patient populations.

Purpose of the Study:

  • To review the development, instrumentation, and applications of combined PET/MR imaging.
  • To highlight the advantages of PET/MR over PET/CT for clinical and research purposes.
  • To discuss the potential roles and challenges of PET/MR in disease assessment.

Main Methods:

  • Review of historical development and instrumentation of PET/MR scanners.
  • Discussion of software-based registration techniques for image fusion.
  • Exploration of quantification methods and potential clinical applications.

Main Results:

  • PET/MR imaging demonstrates potential for superior diagnostic performance in specific applications.
  • MR imaging enhances PET data through improved localization, motion compensation, and partial volume correction.
  • PET/MR facilitates comprehensive structural, functional, and molecular assessment.

Conclusions:

  • Combined PET/MR imaging represents a significant advancement in diagnostic capabilities.
  • PET/MR offers advantages in radiation safety and soft-tissue visualization.
  • Further research and development are needed to fully realize the potential of PET/MR imaging.