Anal/Rectal Cancer MRI Protocol




  • Axial-Coronal-Sagital 3plane T2 Fat Sat (some radiologists preferred T2 non fat sat-because the differentiation with the T2-weighted sequences is based on the contrast between the high-signal-intensity mesorectal fatty tissue and the rather low signal intensity of the tumor, spectral fat suppression techniques are not needed)
  • Axial T1 FSE with short TE(5mm slice thickness) / T1-weighted 3D gradient-echo sequence-Lymph node evaluation
Post contrast MRI Anal cancer
  • T1 fat saturated Axial-Coronal-Sagital 3plane
Technical notes:
  • 3 mm thickness slices preffered.
  • Ensure imaging planes are perfectly perpendicular the mural wall for best assessment of the wall.
  • There is not much role in the staging anal cancer and gadolinium-so for staging purpose we are not using the gad
Angulation 
Axial images have to be abgulated perpendicular to the axis of the tumor to avoid volume averaging.
At first the axial images were not properly angulated. This resulted in the false impression, that the circumferential resection margin was involved on the anterior side (red circle). After proper angulation it was noted, that the CRM was not involved (yellow circle).
Coronal sequences we can plan perpendicular to the axial planiing.

1 comment:

Everette Sessions said...

rectal cancer is a pretty severe digestive health conditions

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