脉冲诊断超声对人胎儿椎体的体外加热

In vitro heating of human fetal vertebra by pulsed diagnostic ultrasound.

作者信息

Doody C, Porter H, Duck F A, Humphrey V F

机构信息

School of Design, Engineering and Computing, Bournemouth University, Poole, UK.

出版信息

Ultrasound Med Biol. 1999 Oct;25(8):1289-94. doi: 10.1016/s0301-5629(99)00071-x.

DOI:10.1016/s0301-5629(99)00071-x

PMID:10576271

Abstract

The temperature rise generated at the surface of unperfused human fetal vertebrae in vitro by an ultrasound beam with characteristics typical of those used in pulsed Doppler examinations has been measured. The bone samples were from fetuses that ranged in age from 14 to 39 weeks, dating from the last menstrual period. The samples were embedded in agar gel and the temperature rise at their surface was measured using a 50-microm diameter K-type thermocouple. The power in the ultrasound beam was 50 +/- 2 mW and the -6 dB diameter was 2.9 mm. The temperature rise at 295 s ranged from 0.6 degrees C in the youngest sample to 1.8 degrees C in the oldest. Approximately 70% of the temperature rise occurred in the first min.

摘要

已测量了在体外未灌注的人类胎儿椎骨表面，由具有脉冲多普勒检查中典型特征的超声束产生的温度升高。骨样本取自末次月经后年龄在14至39周的胎儿。样本嵌入琼脂凝胶中，使用直径50微米的K型热电偶测量其表面的温度升高。超声束的功率为50±2毫瓦，-6分贝直径为2.9毫米。在295秒时，温度升高范围从最年轻样本中的0.6摄氏度到最年长样本中的1.8摄氏度。大约70%的温度升高发生在第一分钟内。