SBRT 2016

MRI to CT Matching

Keep patient positioning the same for MRI and CT scanning  Flat table top  Similar bladder filling and rectum filling instructions (also for treatment)  No rectal coil!!!! Markers are poorly visible on standard MRI sequences that are used to visualize the tumor  Use additional sequence to visualize markers in order to facilitate MRI-to-CT registration Calypso markers give large artefact in MRI  Do MRI before implantation of markers Discuss with the radiologist the MRI settings and sequences  A MRI for radiotherapy has other requirements as for radiology purposes (e.g. slice thickness)