提出了一种改进的空气中超声质量保证灵敏度测试方法。
A proposed enhancement to the in air sensitivity test for ultrasound quality assurance.
机构信息
Radiation Protection & Radiology Physics, Lincoln County Hospital, Greetwell Road, Lincoln LN2 5QY, UK.
出版信息
Phys Med. 2018 Sep;53:1-3. doi: 10.1016/j.ejmp.2018.08.004. Epub 2018 Aug 6.
PURPOSE
A number of guidelines for ultrasound quality assurance recommend the use of the in air reverberation depth as a proxy measure for sensitivity. The test is quantised, i.e. it depends on the brightness of the deepest in air reverberation. The aim of this study was to investigate a possible enhancement to the test, where the gain is reduced to determine the "reverberation threshold".
METHODS
The test was introduced in several ultrasound departments. Results were audited to determine agreement with annual tests of sensitivity using a tissue mimicking test object.
RESULTS
The new test was performed on 100 probes. A change in reverberation threshold was demonstrated in 9 probes; 8 of these also had changes in penetration and/or grey level in a tissue mimicking test object. Reduced penetration but no change in reverberation threshold was seen in 2 probes.
CONCLUSIONS
The reverberation threshold provides a simple enhancement to the in air sensitivity test. Periodic sensitivity testing with a tissue mimicking test object remains important.
目的
许多超声质量保证指南建议使用空气中的混响深度作为灵敏度的代理测量指标。该测试是量化的，即它取决于最深的空气中混响的亮度。本研究的目的是研究该测试的可能改进，即降低增益以确定“混响阈值”。
方法
该测试已在多个超声部门引入。对结果进行审核，以确定与使用组织模拟测试物体的年度灵敏度测试的一致性。
结果
新测试在 100 个探头中进行。9 个探头显示混响阈值发生变化；其中 8 个探头在组织模拟测试物体中也显示穿透和/或灰度的变化。在 2 个探头中，穿透降低，但混响阈值没有变化。
结论
混响阈值为空气中的灵敏度测试提供了一个简单的增强。使用组织模拟测试物体进行定期灵敏度测试仍然很重要。
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