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Future image acquisition trends for PET/MRI.

Andreas Boss1, Markus Weiger2, Florian Wiesinger3

  • 1Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Zurich, Switzerland.

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Hybrid PET/MRI scanners offer advanced imaging with better soft tissue contrast and functional insights but face challenges in attenuation correction and lung imaging compared to PET/CT. New strategies aim to overcome these hurdles for improved disease insights.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Biomedical Engineering

Background:

  • Hybrid PET/MRI systems combine Positron Emission Tomography (PET) and Magnetic Resonance Imaging (MRI) for advanced diagnostics.
  • While commercially available, PET/MRI technology is not yet widely adopted, presenting both opportunities and challenges compared to established PET/CT systems.

Purpose of the Study:

  • To evaluate the advantages and limitations of hybrid PET/MRI compared to PET/CT.
  • To explore novel acquisition strategies for optimizing PET/MRI performance.
  • To investigate the potential of PET/MRI in understanding oncological, inflammatory, and degenerative diseases.

Main Methods:

  • Review of current PET/MRI technology and its comparison with PET/CT.
  • Discussion of technical challenges, including PET attenuation correction using MRI data.
  • Exploration of advanced MRI techniques (diffusion, perfusion, BOLD) integrated with PET.
  • Consideration of optimized hybrid acquisition protocols for sensitivity and specificity.

Main Results:

  • PET/MRI offers superior soft tissue contrast, functional MRI information, multiplanar acquisition, and reduced radiation exposure.
  • Key limitations include challenges in MRI-based PET attenuation correction and lower sensitivity for small pulmonary pathologies compared to CT.
  • New acquisition strategies are emerging to address current obstacles and enhance diagnostic capabilities.

Conclusions:

  • Hybrid PET/MRI holds significant promise for improved diagnostic accuracy and deeper pathophysiological insights across various diseases.
  • Further development of acquisition protocols and technical solutions is crucial for widespread clinical implementation.
  • PET/MRI represents a powerful tool for integrated molecular and functional imaging.