Dudley N J, Griffith K
Medical Physics & IT Services, Nottingham City Hospital NHS Trust, UK.
Ultrasound Med Biol. 1996;22(8):1117-9. doi: 10.1016/s0301-5629(96)00100-7.
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.
产科超声检查中经常进行屏幕周长测量，其他超声专业领域也会进行此类测量。传统上，电子卡尺的准确性是通过在测试对象中进行线性测量来检查的；但这并不能充分测试用于非线性测量的卡尺。本技术说明介绍了一种用于线性和非线性卡尺检查的简单测试对象。结果显示，有一台机器始终会产生较大的测量值过高情况（15%）。这种测量值过高的临床后果可能很严重。进行适当的质量控制至关重要。
