Variation in the estimation of gallbladder volume using the sum-of-cylinders method
| Autor: | Ian R. Wilson, Michael Hurrell, Bruce A. Chapman |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Simvastatin
Supine position Gallbladder Emptying Coefficient of variation Body Mass Index Contractility Medicine Humans Radiology Nuclear Medicine and imaging Lovastatin Hypolipidemic Agents Ultrasonography Reproducibility Observational error business.industry Gallbladder Ultrasound Reproducibility of Results General Medicine Middle Aged medicine.anatomical_structure Bezafibrate Nuclear medicine business Volume (compression) |
| Zdroj: | Investigative radiology. 29(5) |
| ISSN: | 0020-9996 |
| Popis: | RATIONALE AND OBJECTIVES Gallbladder contraction was measured by ultrasound, using the sum-of-cylinders method, as part of a study of the effects of lipid-lowering drugs. Although this method of measurement has been validated in the literature, paired measurements were obtained to provide an additional check on reproducibility. METHODS A total of 136 pairs of gallbladder measurements were made on 17 patients using the sum-of-cylinders method of calculating gallbladder volume. Each pair comprised a left posterior oblique and a supine measurement performed at the same ultrasound examination to assess measurement error. RESULTS There was a large average coefficient of variation of 21%. CONCLUSIONS Marked measurement variability limited the ability of the sum-of-cylinders technique to detect even modest alterations in gallbladder contractility, at least in this population subgroup. |
| Databáze: | OpenAIRE |
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