BACKGROUND: Acquiring SPECT/CT or PET/CT images in patients suffering from claustrophobia can be challenging due to long acquisition times and camera design. This often results in degradation of imaging quality. Virtual Reality (VR) headsets have been successfully used in the emergency department to reduce anxiety and could potentially offer a solution to address this issue in nuclear medicine, hereby obliterating the need for pharmacological sedation.
METHODS: A clinical PET/CT system (FOV 16.2 cm) was used to acquire a 720s PET scan of a Hoffman 3D brain phantom filled with ~23kBq/mL [18F]-FDG. Scan data were reconstructed using various reconstruction settings and were compared to baseline (clinically used reconstruction settings). Recovery Coefficient (RC) and Grey Matter (GM) to White Matter (WM) ratio (GMWMr) were calculated for the whole brain, as well as for the Frontal- (FL), Parietal- (PL) and Occipital lobes (OL). Contours were delineated on the phantoms without VR headset mounted, to which the phantoms with VR headset were registered using rigid transformations.
RESULTS: No significant systematic discrepancies in the RC of multiple regions and GMWMr were observed between images with and without VR headset. RCs of the regions as reconstructed without Point Spread Function (PSF), resp. without and with VR headset mounted, were as follows: RCGM=[0.73-0.75], RCGM-FL=[0.81-0.82], RCGM-OL=[0.78-0.79], RCGM-PL=[0.73-0.72], RCWM=[0.38-0.39], RCWM-FL=[0.45-0.47], RCWM-OL=[0.42-0.44], RCWM-PL=[0.42-0.41], leading to a GMWMr between [1.73-1.93]. For reconstructions with PSF, the following RCs were obtained: RCGM=[0.77-0.78], RCGM-FL=[0.84-0.86], RCGM-OL=[0.82-0.82], RCGM-PL=[0.75-0.74], RCWM=[0.36-0.37], RCWM-FL=[0.42-0.44], RCWM-OL=[0.40-0.42], RCWM-PL=[0.41-0.40], leading to a GMWMr between [1.85-2.13]. No visual differences were present in the PET image, although some streak artefacts were present at the level of the battery pack. The attenuation map of that image was less subject to artefacts: [0.02-0.02]/mm vs [134-176] HUAvg for a sphere VOI close to the battery pack within the plastic discs, respectively without and with VR headset mounted.
CONCLUSIONS: The impact on PET imaging is limited. We conclude that a VR headset can be used during PET/CT imaging.
Originele taal-2English
StatusPublished - 9 sep 2023
EvenementEANM'23 - Vienna, Austria
Duur: 9 sep 202313 sep 2023


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