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Technical Note: Adapting a GE SIGNA PET/MR scanner for radiotherapy.
Patrik Brynolfsson1, Jan Axelsson1, August Holmberg1
1Department of Radiation Sciences, Umeå University, Umeå, 901 87, Sweden.
Medical Physics
|June 5, 2018
Summary
This study adapted a PET/MR scanner for radiotherapy, ensuring accurate PET attenuation correction and acceptable MR image quality. The developed tabletop and coil holder enable patient imaging in treatment positions for improved radiotherapy planning.
Area of Science:
- Medical Imaging
- Radiotherapy Physics
Background:
- Simultaneous Positron Emission Tomography (PET) and Magnetic Resonance (MR) imaging is valuable for radiotherapy, aiding target definition and dose escalation.
- A key challenge is imaging patients in the treatment position for radiotherapy workflow integration.
Purpose of the Study:
- To adapt a GE SIGNA PET/MR scanner for radiotherapy treatment planning.
- To evaluate the impact of this adaptation on MR image signal-to-noise ratio (SNR) and PET attenuation correction accuracy.
Main Methods:
- Developed a flat tabletop and coil holder for patient positioning in treatment position.
- Measured and implemented attenuation corrections for the new hardware and an anterior array flex coil.
- Evaluated MR SNR reduction using a saline phantom and PET quantitation errors with/without corrections.
Main Results:
- PET activity quantitation errors were within ±5% with implemented attenuation corrections.
- MR image SNR decreased to 74% with the tabletop and 66% with both tabletop and coil holders.
Conclusions:
- A tabletop and coil holder system was successfully developed for a GE SIGNA PET/MR scanner for radiotherapy workflow.
- Attenuation correction of added hardware ensures acceptable PET quantitation.
- Reduced MR SNR necessitates potential adjustments to imaging protocols.
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