Designed for the MIMI (multiple imaging modality isocentricity) phantom, HexaCheck allows secure integration with the phantom to make it simple to perform 6D couch commissioning and QA in image-guided radiotherapy.
Treatment delivery systems commonly incorporate 6DoF (six degrees of freedom) couches able to correct for rotational errors in all three directions along with translational corrections. HexaCheck provides a precise method for performing 6D couch commissioning and QA, says UK distributor Oncology Imaging Systems (OIS). The phantom holder is secured into the couch for isocentre alignment, while locking mechanisms for offset angles ensure accuracy every time.
Norfolk and Norwich University Hospitals NHS Foundation Trust lead clinical scientist for QA and machine dosimetry Will Holmes-Smith described his experience with HexaCheck: “We have three of the HexaCheck and MIMI phantoms in the department, one for each linac that has a 6DoF couch. We use them for weekly 6DoF couch QA. While there were other solutions to doing QA for a 6DoF couch we felt that this was the best option as you are able to produce random shifts and rotations using the phantom to test the system; the test is not restricted to a set of movements, so the random and systematic errors in the system are checked.”
Picture: The HexaCheck device allows secure integration with the MIMI phantom.
See the full report on page 17 of the April 2021 issue of RAD Magazine.