临床诊断超声换能器的声强测量及其与热指数的相关性。

Measured acoustic intensities for clinical diagnostic ultrasound transducers and correlation with thermal index.

机构信息

Department of Obstetrics and Gynecology, Helse Stavanger, Stavanger, Norway.

National Centre for Ultrasound in Gastroenterology, Haukeland University Hospital, Bergen, Norway.

出版信息

Ultrasound Obstet Gynecol. 2017 Aug;50(2):236-241. doi: 10.1002/uog.17298. Epub 2017 Jun 20.

DOI:10.1002/uog.17298

PMID:27608142

Abstract

OBJECTIVES

To investigate if the thermal index for bone (TIB) displayed on screen is an adequate predictor for the derated spatial-peak temporal-average (I ) and spatial-peak pulse-average (I ) acoustic intensities in a selection of clinical diagnostic ultrasound machines and transducers.

METHODS

We calibrated five clinical diagnostic ultrasound scanners and 10 transducers, using two-dimensional grayscale, color Doppler and pulsed-wave Doppler, both close to and far from the transducer, with a TIB between 0.1 and 4.0, recording 103 unique measurements. Acoustic measurements were performed in a bespoke three-axis computer-controlled scanning tank, using a 200-μm-diameter calibrated needle hydrophone.

RESULTS

There was significant but poor correlation between the acoustic intensities and the on-screen TIB. At a TIB of 0.1, the I range was 0.51-50.49 mW/cm and the I range was 0.01-207.29 W/cm . At a TIB of 1.1, the I range was 19.02-309.44 mW/cm and the I range was 3.87-51.89 W/cm .

CONCLUSIONS

摘要

目的

研究在一系列临床诊断超声设备和换能器中，屏幕上显示的骨热指数（TIB）是否可以作为空间峰值时间平均声强（IspTA ）和空间峰值脉冲平均声强（Ipp ）的预估值。

方法

我们对五台临床诊断超声扫描仪和十个换能器进行了校准，使用二维灰度、彩色多普勒和脉冲波多普勒，在接近和远离换能器的情况下，TIB 在 0.1 到 4.0 之间，记录了 103 个独特的测量值。声强测量在定制的三轴计算机控制扫描池中进行，使用直径为 200μm 的校准针状水听器。

结果

声强与屏幕上的 TIB 之间存在显著但较差的相关性。在 TIB 为 0.1 时，IspTA 范围为 0.51-50.49 mW/cm ，Ipp 范围为 0.01-207.29 W/cm 。在 TIB 为 1.1 时，IspTA 范围为 19.02-309.44 mW/cm ，Ipp 范围为 3.87-51.89 W/cm 。