ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

3aPA8. Temperature rise generated by diagnostic ultrasound in a transcranial phantom.

Junru Wu

Frances Cubberley

Gerard Gormley

Dept. of Phys., Univ. of Vermont, Burlington, VT 05405

Thomas L. Szabo

Hewlett--Packard Imaging Systems, Andover, MA 01810

Temperature rises generated by diagnostic ultrasound from a commercial system (Sonos 1000 Hewlett--Packard) in a transcranial phantom that consists of human temporal bone and tissue-mimicking material are measured. Significant temperature rises were found at the external and internal temporal bone surfaces.. The experimental results are compared with Cranial Thermal Indices (TIC) developed by American Institute of Ultrasound in Medicine and National Electrical Manufacturers association in 1992 for various modes. For all the modes compared, TIC underestimated temperature rise at the external temporal bone surface. The differences between the data and temperature rises predicted by TIC can be attributed to transducer surface heating. [Work supported by Hewlett--Packard Co.]