2017_SBRT_Course Book

MRI to CT Registration

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)