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SURLAS

Scanning Ultrasound Reflector Linear Array System

The SURLAS (Scanning Ultrasound Reflector - Linear Arrays System) is a superficial ultrasound hyperthermia system for simultaneous thermoradiotherapy. After considerable developmental and testing efforts, we are in the process of laboratory testing (incl. FDA) of a clinical system. The overall system consists of an applicator, a 16-channel RF generator, a 16 channel-thermometry unit, a PC with controlling software, and other supporting electronics. The major functional parts of the applicator are two parallel-opposed ultrasound arrays with electrical impedance matching networks, a scanning slider connected to a dual-face acoustic reflector, slider scanning unit with magnetic movement sensors, and the applicator's acrylic body with a custom-molded silicone membrane bolus. The ultrasound arrays (Navy Type I) operate at frequencies 1.9 MHz and 4.9 MHz. The water filled acrylic body with scanning reflector (Styrofoam on acrylic plate) minimally perturbs/absorbs electron/photon beams from a Linac. Each array has 8 independent elements. The treatment window is 16 cm x 16 cm. This configuration provides 3D power deposition controllability. An electrical impedance matching network was designed for every piezoelectric element separately to achieve a maximum output power from the ultrasound arrays. The slider/reflector moving unit, the supporting electronics, and the software assure an accurate, stable, and acoustically noiseless positioning of the reflector. The SURLAS PC-based software monitors the proper operation of the entire system, and coordinates all peripheral devices. The software is able to communicate with the thermometry unit as well and provides multi-level security, quality assurance, and treatment control features.

Support: NIH grant R01-CA63121

Published papers:

P. Novak, E. Moros, W. Straube and R. Myerson: Treatment delivery software for a new clinical grade ultrasound system for thermoradiotherapy. Medical Physics, 2005;32(11): pp 3246-3257.

P. Novak, E. G. Moros, W. L. Straube and R. J. Myerson: SURLAS: A new clinical grade ultrasound system for sequential or concomitant thermoradiotherapy of superficial tumors: Applicator description. Medical Physics, 2005;32(1): pp 230-240.

E.G. Moros, X. Fan, and W.L. Straube, "Experimental assessment of power and temperature penetration depth control with a dual frequency ultrasonic system," Med Phys 1999:26, 810-817.

E.G. Moros, X. Fan, W.L. Straube, and R.J. Myerson, "Numerical and in vitro evaluation of temperature fluctuations during reflected-scanned planar ultrasound hyperthermia," Int J Hyperthermia 1998:14, 367-382.

E.G. Moros, X. Fan, and W.L. Straube, "An investigation of penetration depth control using parallel opposed ultrasound arrays and a scanning reflector," J Acoust Soc Am, 1997:101, 1734-1741.

E.G. Moros, W.L. Straube, and R.J. Myerson, "A reflected-scanned ultrasound system for external simultaneous thermoradiotherapy," IEEE T Ultrason Ferr 1996:43, 441-449.

E.G. Moros, W.L. Straube, and R.J. Myerson, "Potential for power deposition conformability using reflected-scanned planar ultrasound," Int J Hyperthermia 1996:12, 723-736.

E.G. Moros, W.L. Straube, E.E. Klein, M. Yousaf, and R.J. Myerson, "Simultaneous delivery of electron beam therapy and ultrasound hyperthermia using scanning reflectors: a feasibility study," Int J Radiat Oncol Biol Phys 1995, 31, 893-904.

SURLAS highlinghts:

Crossection of the SURLAS applicator model.

Disassembled model of the SURLAS applicator.

A prototype of the SURLAS applicator.

SURLAS software - setting up the heating sector configuration (the treatment window is parceled in 64 independent 2cm by 2cm virtual sectors).

SURLAS software - configuration of the ultrasound arrays.

SURLAS software - device options window.

University of Arkansas for Medical Sciences
Department of Radiation Oncology
4301 W. Markham St., Little Rock, AR 72205
Tel. (501) 686 7100, Fax (501) 686 7285

To Make an Appointment Call the Appointments Center at:
1-501-686-8000or call directly our Department at 1-501-526-6155
For Patient Information/Rooms, Call 1-501-686-6416
For General Information and for Numbers Not Listed, Call 1-501-686-7000
For International Patient Appointments, Call 1-501-686-8071

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This page was edited on Tue Nov 28 08:40:41 CST 2006

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