Fig. 2.

a The template holder is built with rectangular-shaped fiducials in a fixed position. Three fiducials are enclosed within the template holder. The template secures into place onto the template holder, and the user replaces the template between patients. b A screenshot of the template calibration page from the system’s GUI. The image shows the expected fiducial locations displayed as blue rectangular boxes on the left, right and top of the estimated virtual template represented in yellow. The user may scroll through the fiducial localizer scan and rotate or translate the overlay to match it to the fiducials on the image