Intraobserver and interobserver variability of 64-row computed tomography abdominal aortic aneurysm neck measurements

Diehm, Nicolas; Kickuth, Ralph; Gahl, Brigitta; Do, Dai-Do; Schmidli, Jürg; Rattunde, Henning; Baumgartner, Iris; Dick, Florian (2007). Intraobserver and interobserver variability of 64-row computed tomography abdominal aortic aneurysm neck measurements. Journal of vascular surgery, 45(2), pp. 263-8. Amsterdam: Elsevier 10.1016/j.jvs.2006.10.004

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BACKGROUND: Integrity of the abdominal aortic aneurysm (AAA) neck is crucial for the long-term success of endovascular AAA repair (EVAR). However, suitable tools for reliable assessment of changes in small aortic volumes are lacking. The purpose of this study was to assess the intraobserver and interobserver variability of software-enhanced 64-row computed tomographic angiography (CTA) AAA neck volume measurements in patients after EVAR. METHODS: A total of 25 consecutive patients successfully treated by EVAR underwent 64-row follow-up CTA in 1.5-mm collimation. Manual CTA measurements were performed twice by three blinded and independent readers in random order with at least a 4-week interval between readings. Maximum and minimum transverse aortic neck diameters were measured twice on two different levels within the proximal neck. Volumetry of the proximal aortic neck was performed by using dedicated software. Variability was calculated as 1.96 SD of the mean arithmetic difference according to Bland and Altman. Two-sided and paired t tests were used to compare measurements. P values <.05 were considered to indicate statistical significance. RESULTS: Intraobserver agreement was excellent for dedicated aneurysmal neck volumetry, with mean differences of less than 1 mL (P > .05), whereas it was poor for transverse aortic neck diameter measurements (P < .05). However, interobserver variability was statistically significant for both neck volumetry (P < .005) and neck diameter measurements (P < .015). CONCLUSIONS: The reliability of dedicated AAA neck volumetry by using 64-row CTA is excellent for serial measurements by individual readers, but not between different readers. Therefore, studies should be performed with aortic neck volumetry by a single experienced reader.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Cardiovascular Disorders (DHGE) > Clinic of Angiology
04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology
04 Faculty of Medicine > Department of Cardiovascular Disorders (DHGE) > Clinic of Cardiovascular Surgery

UniBE Contributor:

Diehm, Nicolas Alexander; Kickuth, Ralph; Schmidli, Jürg; Rattunde, Henning and Dick, Florian

ISSN:

0741-5214

ISBN:

17264000

Publisher:

Elsevier

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:51

Last Modified:

06 Dec 2013 13:44

Publisher DOI:

10.1016/j.jvs.2006.10.004

PubMed ID:

17264000

Web of Science ID:

000243987200009

URI:

https://boris.unibe.ch/id/eprint/21553 (FactScience: 7409)

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