Accuracy of computer-aided measurements in endovascular stent-graft planning: an experimental study with two phantoms.
OBJECTIVE
The aim of this study was to evaluate the accuracy of the new measurement software, created for aortic stent-graft planning. The software finds semiautomatically the centerline of the vessel from computer tomographic angiography data and calculates semiautomatically diameters and lengths.


METHODS
Two phantoms were constructed, scanned by CT and measured with the measurement software. Results were compared with the known dimensions of the phantoms and mean fractional errors were calculated. Linear regression analysis was also made between measured and known diameters.


RESULTS
The mean fractional error (+/- SD) for all diameter measurements combined was 0.017 +/- 0.011. In the linear regression analysis, was 1.000. For length measurements, the mean fractional error (+/- SD) was 0.009 +/- 0.0006.


CONCLUSIONS
The software enables accurate measurements perpendicular or parallel to the semiautomatically created centerline path.
Isokangas
Juha-Matti
JM
Deparment of Diagnostic and International Radiology, Oulu University, Oulu, Finland. juhamatti.isokangas@ppshp.fi
Hietala
Rami
R
Perälä
Jukka
J
Tervonen
Osmo
O
D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging / Q000601:surgery*; D001807:Blood Vessel Prosthesis; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D021621:Imaging, Three-Dimensional; D019047:Phantoms, Imaging; D012680:Sensitivity and Specificity; D012984:Software; D015607:Stents; D014057:Tomography, X-Ray Computed