"Note: This article is intended to outline some general principles of protocol design. The specifics will vary depending on MRI hardware and software, radiologist's and referrer's preference, institutional protocols, patient factors (e.g. allergy) and time constraints. "
"Note: This article is intended to outline some general principles of protocol design. The specifics will vary depending on MRI hardware and software, radiologist's and referrer's preference, institutional protocols, patient factors (e.g. allergy) and time constraints."
"T1 weighted"
"T2 weighted"
"diffusion-weighted imaging (DWI)"
"postcontrast sequencesmost institutions do not include post-contrast images on the assessment of anal canal tumours as it is unlikely to give additional information to the high-resolution T2 images 2-5"
"sequence: fast-spin echo (T1 FSE) or gradient (T1 MPRAGE)"
"anal canal centred high-spatial-resolution images (small FOV) on three planes 2"
"sequence: T2 FSE, high-resolution T2-weighted sequences with the small FOV images"
"sequence: T2 FSE, high-resolution T2-weighted sequences with the small FOV images"
"small FOV: delineation of anal canal layers allowing evaluation of tumour depth (hyperintense submucosa, hypointense muscularis propria, and hypointense mesorectal fascia) 2coronal images aid in assessing for extension along with the internal and external sphincters"
Expected headings
"Sequences"
"purpose: evaluation of the tumour cellularity; assessment of tumour recurrence after treatment 4"