Computed tomography colonography: automated diameter and volume measurement of colonic polyps compared with a manual technique--in vitro study
| Autor: | Elizabeth G. McFarland, Justine McQuillan, David Burling, Lesley Honeyfield, Stuart A. Taylor, H. Amin, Jamshid Dehmeshki, Steve Halligan, M Roddie |
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| Rok vydání: | 2005 |
| Předmět: |
Pathology
medicine.medical_specialty biology business.industry Phantoms Imaging Limits of agreement Colonic Polyps Equipment Design biology.organism_classification Span (engineering) Whiting Computed Tomography Colonography Volume measurement Fully automatic In vitro study Calipers Medicine Radiology Nuclear Medicine and imaging business Nuclear medicine Colonography Computed Tomographic |
| Zdroj: | Journal of computer assisted tomography. 29(3) |
| ISSN: | 0363-8715 |
| Popis: | Objective: To investigate inter- and intraobserver agreement of automated measurement of polyp diameter in vitro. Methods: Two phantoms ("QRM" and "Whiting") containing simulated polyps of known diameter and volume were scanned using 16-detector row computed tomography. Two observers estimated polyp diameter using 3 methods: software calipers ("manual"), freehand boundary identification ("semiautomatic"), and automated software segmentation ("fully automatic"). Results: Intraobserver 95% limits of agreement for diameter were narrowest for the fully automatic method (QRM span: 0.39 mm, 0.48 mm; Whiting span: 0.24 mm, 0 mm). Manual estimates were approximately 10 times wider (QRM span: 3.57 mm, 3.21 mm; Whiting span: 3.2 mm, 2.02 mm). Volume estimates were narrowest for the fully automatic method (span: 24.2 mm 3 , 24.1 mm 3 vs. 97.9 mm 3 , 102.9 mm 3 for semiautomatic measurement). Interobserver agreement for diameter was narrowest for the fully automatic method (QRM span: 0.12 mm, Whiting span: 0.16 mm), with the manual method approximately 18 times wider (QRM span: 2.87 mm, Whiting span: 2.18 mm). Conclusion: Fully automated measurement of polyp diameter and volume is technically feasible and results in superior inter- and intraobserver agreement. |
| Databáze: | OpenAIRE |
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