Measuring sphere-like structures using transrectal ...

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Title Measuring sphere-like structures using transrectal ultrasonography
Author(s) Robert M. Lofstedt, W. P. Ireland
Journal Veterinary Radiology & Ultrasound: The Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association
Date 2000
Volume 41
Issue 2
Start page 178
End page 180
Abstract Sphere-like structures are commonly measured for clinical or research purposes. We measured two diameters, the circumference (perimeter) and cross sectional area of 113 equine ovarian follicles in a water bath then determined the relationships between those measurements and the actual volume of fluid in the follicles. Cross-sectional area, diameter3 and area2/3 were all highly correlated with the volume of the structures and superior (p 0.05) between cross-sectional area, diameter3, and area2/3. Because of the ease of measuring diameter, we suggest that diameter3 be used to estimate the actual size of sphere-like structures by ultrasonographic measurement. A table was generated for clinical use to show how much the largest diameter of a fluid-filled structure (follicle, cyst, hematoma, etc.) would have to increase or decrease to indicate a significant change in the volume of the structure.

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