Abstract
Purpose: The purpose of this study was to assess accuracy and reliability
of a volumetric analysis of abdominal aneurysms on the basis of multidetector
row computed tomographic angiography (CTA) and magnetic resonance
angiography (MRA) with a commercially available automated vessel
analysis software program. Materials and methods: Twenty patients
with abdominal aortic aneurysms underwent preoperative CTA and MRA
before endovascular repair. Postdeployment CTA was performed in 15
of these 20 patients (75%). All preoperative CTA and MRA and postdeployment
CTA data sets were analyzed with an automated software tool. The
length of the stent grafts on postdeployment CTA was measured and
compared with the true length of the primary component. Two readers
independently evaluated 13 vessel parameters on preoperative CTA
and MRA, which are considered to be important in planning stent graft
deployment. Results: With the automated analysis software tool, all
measurements could be performed on either CTA or MRA data sets. There
was no statistically significant difference between postdeployment
measurements of stent graft length on CTA and the true dimensions
of the implanted stent grafts. Interobserver agreement for all of
the measurements with either CTA or MRA was good to excellent (interclass
coefficient, 0.71 to 0.99) with only minimal mean differences of
measured dimensions between both readers (range, -2.0 to +2.3 mm,
Bland-Altman). Intermodality agreement between CTA and MRA was good
to excellent (interclass coefficient, 0.62 to 0.98) with small mean
differences of measured dimensions between both methods (range, -4.1
to +2.1 mm, Bland-Altman). Conclusion: Volumetric measurement with
an automated analysis software tool allows a fast, precise, and reliable
noninvasive preoperative determination of all aortic dimensions on
the basis of either CTA or MRA data sets
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