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Ultrasound Med Biol. 1996;22(8):1117-9.

The importance of rigorous testing of circumference measuring callipers.

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Medical Physics & IT Services, Nottingham City Hospital NHS Trust, UK.


On-screen circumference measurements are frequently made in obstetric ultrasound and are also made in other ultrasound specialties. The accuracy of electronic callipers is traditionally checked by linear measurement in a test object; this does not adequately test callipers used for nonlinear measurement. This technical note describes a simple test object designed for both linear and nonlinear calliper checks. Results show one machine to generate consistently large overmeasurements (15%). The clinical consequences of such overmeasurement may be serious. Appropriate quality control is essential.

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