Advances in Clinical PET/MRI Instrumentation

Area of Science:

• Medical Imaging Technology
• Radiological Physics

Background:

• The introduction of whole-body PET/MRI scanners in 2010 revolutionized diagnostic capabilities.
• Early systems included sequential Philips PET/MRI and integrated Siemens PET/MRI, utilizing avalanche photodiodes for PET integration within MRI.

Purpose of the Study:

• To review the technological evolution and clinical experiences of early whole-body PET/MRI systems.
• To identify areas for improvement in PET/MRI technology and clinical protocols.

Main Methods:

• Analysis of the technological specifications of early clinical PET/MRI scanners (Philips, Siemens).
• Review of clinical experiences and identified limitations, including software aspects like attenuation correction.
• Examination of advancements in subsequent systems, such as General Electric's 2014 integrated PET/MRI with SiPM detectors.

Main Results:

• Initial clinical PET/MRI systems demonstrated the feasibility of integrated imaging.
• Software improvements, particularly in attenuation correction, were identified as necessary.
• Development of efficient combined PET and MRI protocols is ongoing.
• Advancements in MRI components, including sequences and coils, are enhancing current PET/MR imaging systems.

Conclusions:

• The early adoption of PET/MRI highlighted the need for software optimization and protocol development.
• Technological progress, including new detector technologies (SiPM) and MRI enhancements, continues to drive the field forward.