Mixed-reality hologram for diagnosis and surgical planning of double outlet of the right ventricle: a pilot study

AIM: To evaluate the mixed-reality (MR) hologram, a novel technology based on two-dimensional images, which simulates three-dimensional (3D) images and provides a dynamic and interactive alternative, for its usefulness in the diagnosis and surgical planning of double outlet of the right ventricle (DORV). MATERIALS AND METHODS: Thirty-four patients who were suspected of DORV based on ultrasound findings underwent cardiac computed tomography angiography (CIA). The patients were assigned randomly to the MR holographic guidance (MRHG) group or the control group. For the patients in the MRHG group, the CTA images were converted into Standard Template Library (STL) files after segmentation, 3D reconstruction, colourisation, and transparentisation, and then exported for MR holographic visualisation. The CTA images of the patients in the control group were analysed using routine 3D reconstruction only. Diagnostic accuracy and surgical planning were compared between the two groups based on visualisation at surgery. RESULTS: In the MRHG group, the 3D hologram observation was in concordance with the actual anatomical findings, and the DORV type was classified accurately in all patients. The diagnostic accuracy for the malformation was 95.5% in the MRHG group and 89.7% in the control group, but the difference was not significant (p=0.3). All the procedures were exactly the same as planned based on the 3D MR holographic model. The surgical planning time was shorter for the MRHG group (51.65 +/- 11.11 min) than that for the control group (65.71 +/- 18.07 min, p<0.05). CONCLUSION: MR 3D holograms may provide a clear and deeper anatomical perception of DORV and improve surgical planning. (C) 2020 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.