+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

A multi-element ultrasonic hyperthermia applicator with independent element control

A multi-element ultrasonic hyperthermia applicator with independent element control

International Journal of Hyperthermia 3(3): 257-267

Acoustic field patterns from a planar multi-element ultrasonic applicator were determined experimentally and compared with theory. Measurements were obtained from square arrays of 4 and 16 elements. The acoustic fields produced by various configurations of individual square elements (3.6 cm X 3.6 cm) driven at 1 MHz were measured in water. Transverse and axial scans paths were used to characterize the acoustic beam for different aperture sizes and individual element excitations. Unequal power excitation of adjacent elements produced multiple peaked acoustic intensity patterns. While a simple theoretical model was not able to account for all the experimentally determined transverse and axial field patterns, a model including mechanical damping improved the agreement between theory and experiment. However, less ripple in the axial pattern was measured than predicted by either theoretical model. The ability of the applicator to generate acoustic field patterns suitable for local tissue heating was demonstrated by an experimental study in dog thigh muscle.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 039080806

Download citation: RISBibTeXText

PMID: 3655439

DOI: 10.3109/02656738709140392

Related references

Clinical experience with a multi-element ultrasonic hyperthermia system: analysis of treatment temperatures. International Journal of Hyperthermia 6(5): 909-922, 1990

Axial control of thermal coagulation using a multi-element interstitial ultrasound applicator with internal cooling. IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control 47(1): 170-178, 2000

Finite element analysis of the re-entrant type resonant cavity applicator for brain tumor hyperthermia. Conference Proceedings 2007: 3540-3543, 2007

Assessment of the performance characteristics of a prototype 12-element capacitive contact flexible microstrip applicator (CFMA-12) for superficial hyperthermia. International Journal of Hyperthermia 20(6): 607-624, 2004

A simulation of ultrasonic hyperthermia using a finite element model. IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control 33(6): 765-777, 1986

A multi-element interstitial ultrasound applicator for the thermal therapy of brain tumors. Journal of the Acoustical Society of America 134(2): 1647-1655, 2013

Multi-element, multi-medium regional geochemistry in the European Arctic; element concentration, variation and correlation. Applied Geochemistry 16(7-8): 759-780, 2001

Multi element distribution in biological material 4. the behavior of multi element distributions in onions from different localities. Osaka City Medical Journal 24(1): 111-122, 1978

Multi element microwave applicators for localized hyperthermia. Strahlentherapie 161(9): 535, 1985

Performance of a multi-sector ultrasound hyperthermia applicator and control system: in vivo studies. International Journal of Hyperthermia 6(3): 697-705, 1990

An edge-element based finite element model of microwave heating in hyperthermia: method and verification. International Journal of Hyperthermia 18(5): 426-440, 2002

An edge-element based finite element model of microwave heating in hyperthermia: application to a bolus design. International Journal of Hyperthermia 18(5): 441-453, 2002

Edge-element based finite element analysis of microwave hyperthermia treatments for superficial tumours on the chest wall. International Journal of Hyperthermia 19(4): 414-430, 2003

High permittivity patch radiator for single and multi-element hyperthermia applicators. IEEE Transactions on Bio-Medical Engineering 40(7): 711-715, 1993

Modelling of the radiated field from multi-element capacitive micromachined ultrasonic transducers. Ultrasonics 42(1-9): 447-452, 2004