Abstract
Purpose: 1) To compare measurements obtained with MR imaging (MRI)/contrast-enhanced
MR angiography (CE MRA) with measurements obtained with angiography
(DSA) and CT, for stent-graft sizing of abdominal aortic aneurysms
(AAA). 2) To compare MRA measurements obtained with the two post
processing techniques MIP (maximum intensity projection) and VRT
(3D volume rendering technique). Material and Methods: The prospective
study included 20 consecutive patients with AAA identified by DSA
and CT as suitable for endovascular repair. For the study, MRI/CE
MRA was performed. Five measurement variables for stent-graft sizing
were chosen. Comparisons were made between MRI/CE MRA, DSA and CT,
and between observers. Comparisons were also made between MIP and
VRT. Results: Significantly shorter lengths were obtained with MRA-MIP
than with DSA. Three out of six diameter measurements were significantly
smaller on MRI/CE MRA than on DSA and CT. No significant differences
were found between the observers. One diameter measurement was significantly
smaller on MIP than on VRT, while the other measurements showed no
significant differences. Conclusion: The length measurements obtained
with MRA-MIP were probably more correct than those with DSA. For
more reliable diameter measurements with CE MRA, improvements of
the technique, including VRT reconstructions and a standardized determination
of the vessel boundaries, are needed
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