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.]