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Reproducibility of aortic annulus measurements by computed tomography.
MedLine Citation:
PMID:  24845112     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVES: To evaluate a systematic approach for measurement of aortic annulus dimensions by cardiac computed tomography.
METHODS: CT data sets of 64 patients were evaluated. An oblique cross-section aligned with the aortic root was created by systematically identifying the caudal insertion points of the three aortic cusps and sequentially aligning them in a double oblique plane. Aortic annulus dimensions, distances of coronary ostia and a suitable fluoroscopic projection angle were independently determined by two observers.
RESULTS: Interobserver intraclass correlation coefficients (ICC) for aortic annulus diameters were excellent (ICC 0.89-0.93). Agreement for prosthesis size selection was excellent (ĸ = 0.86 for mean, ĸ = 0.84 for area-derived and ĸ = 0.91 for circumference-derived diameter). Mean distances of the left/right coronary ostium were 13.4 ± 2.4/14.4 ± 2.8 mm for observer 1 and 13.2 ± 2.7/13.5 ± 3.2 mm for observer 2 (p = 0.30 and p = 0.0001, respectively; ICC 0.76/0.77 for left/right coronary artery). A difference of less than 10° for fluoroscopic projection angle was achieved in 84.3 % of patients.
CONCLUSIONS: A systematic approach to generate a double oblique imaging plane exactly aligned with the aortic annulus demonstrates high interobserver and intraobserver agreements for derived measurements which are not influenced by aortic root calcification.
KEY POINTS: • Systematic approach to generate a double oblique imaging plane for TAVI evaluation. • This method is straightforward and software independent. • An approach with high reproducibility, not influenced by aortic root calcification.
Authors:
Annika Schuhbaeck; Stephan Achenbach; Tobias Pflederer; Mohamed Marwan; Jasmin Schmid; Holger Nef; Johannes Rixe; Franziska Hecker; Christian Schneider; Michael Lell; Michael Uder; Martin Arnold
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-5-22
Journal Detail:
Title:  European radiology     Volume:  -     ISSN:  1432-1084     ISO Abbreviation:  Eur Radiol     Publication Date:  2014 May 
Date Detail:
Created Date:  2014-5-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9114774     Medline TA:  Eur Radiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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