Faster and improved MRI of rectal tumors with a two sequence protocol based on high-resolution free-breathing post-contrast 3D SPGR imaging with comparison to standard care.
Andreas M. Loening 1 , Pejman Ghanouni 1 , Marcus T. Alley 1 , and Shreyas S. Vasanawala 1
Dept. of Radiology, Stanford University,
Stanford, CA, United States
Conventional protocols for MRI staging of rectal tumors
include multiple planes of T2-weighted imaging in
addition to DWI and T1-weighted sequences, requiring
30-40 min to acquire. To decrease the time of these
studies, we compared a conventional protocol to a 10-min
fast protocol that utilized a single sequence of
T2-weighted imaging in combination with a
high-resolution free-breathing post-contrast 3D SPGR
sequence. Two readers assessed imaging findings and
assessed confidence scores from 20 patient cases.
Despite greatly reduced acquisition time, the fast
protocol demonstrated a significantly increased
confidence in T and N staging, and a non-significant
trend toward improved clinical staging.
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