TY - JOUR
T1 - Analysis of temperature responses to diffused ultrasound focal fields produced by a sector-vortex phased array
AU - Umemura, S. I.
AU - Cain, C. A.
N1 - Funding Information:
This study was supported by Hitachi Central Research Laboratory (HCRL), Hitachi, Ltd, Tokyo, Japan, by NIH Grant CA44124, and by Grant ECS87OOO1 from the National Center for Supercomputer Applications (NCSA) at the University of Illinois. The numerical simulations presented herein were obtained using a Hitachi Hitac S-810 at HCRL and a Cray XMP-48 at NCSA. The authors thanks to Miss E. Ohyama with HCRL and the staff at NCSA for their cooperation. The authors also thank Dr J. C. Chato (Department of Mechanical and Industrial Engineering, University of Illinois) for useful discussions.
PY - 1990
Y1 - 1990
N2 - The sector-vortex applicator, a disc-shaped ultrasound phased array with a geometric focus having multiple sectors and tracks, can directly synthesize, without scanning, diffuse focal patterns useful for hyperthermia. Temperature distribution patterns resulting from these acoustic fields have been simulated by solving a steady-state bioheat equation numerically for a wide range of blood perfusion rates. These results suggest that the sector-vortex array will be particularly suitable for heating non-superficial small tumours. The temperature distribution pattern changes due to variations in blood perfusion are interpreted based on spatial frequency domain Fourier analysis of temperature responses to different power deposition patterns. The system behaves like a low-pass spatial frequency filter.
AB - The sector-vortex applicator, a disc-shaped ultrasound phased array with a geometric focus having multiple sectors and tracks, can directly synthesize, without scanning, diffuse focal patterns useful for hyperthermia. Temperature distribution patterns resulting from these acoustic fields have been simulated by solving a steady-state bioheat equation numerically for a wide range of blood perfusion rates. These results suggest that the sector-vortex array will be particularly suitable for heating non-superficial small tumours. The temperature distribution pattern changes due to variations in blood perfusion are interpreted based on spatial frequency domain Fourier analysis of temperature responses to different power deposition patterns. The system behaves like a low-pass spatial frequency filter.
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U2 - 10.3109/02656739009140960
DO - 10.3109/02656739009140960
M3 - Article
C2 - 2376675
AN - SCOPUS:0025334047
VL - 6
SP - 641
EP - 654
JO - International Journal of Hyperthermia
JF - International Journal of Hyperthermia
SN - 0265-6736
IS - 3
ER -
