1 To begin, 2 prepare patient-specific segment anatomy 3 and the VR model. 4 Import the finalized model as glTF file 5 in the Lesson Creation menu, 6 and click Confirm in the popup 7 stating that the file type is not fully supported. 8 After pressing the joystick down, 9 go to the transparency menu 10 and hide all models except the target aneurysm anatomy.
11 Position the physician in VR 12 and familiarize them with the anatomy lesson. 13 Start the recording in the VR space, 14 and let the surgeon rotate the target anatomy 15 to find the preferred angles for both anteroposterior 16 and lateral fluoroscopy. 17 Then, press the stop button.
18 Place an image mimicking the background 19 of a fluoroscopy image behind the model 20 in the virtual space. 21 The surgeon will appear as a set 22 of floating glasses and two controllers in VR.23 Place the camera in line with the surgeon's view, 24 pointing roughly at the center of the target anatomy. 25 Then, capture a 2D snapshot in the desired position 26 and repeat for each preferred angle.
27 To acquire C-arm angles, pause the recorded lesson 28 when the surgeon declares a preferred viewing angle. 29 Click the track pad to open the quick menu 30 and select the protractor on/off checkbox. 31 Using the controller grab button, 32 select and manipulate a pointer 33 or straight edge in line with the surgeon's viewpoint 34 to pass through the origin of the protractor.
35 Step back from the model 36 and view the angles from the orthographic viewpoints 37 corresponding with the C-arm motions. 38 Acquire the anteroposterior angles 39 from the sagittal and axial planes, 40 followed by the lateral angles 41 from the coronal and axial planes. 42 The axial plane corresponds with the right 43 and left angles of the C-arm, 44 while the sagittal and coronal planes 45 correspond with the cranial and caudal angles.
46 The surgeon declared anteroposterior angles in VR 47 were similar to the angle measurements 48 taken during the surgery 49 and the actual surgical fluoroscopy image, 50 whereas for the same case, 51 discrepancies were observed in the lateral views.
