Field conjugate acoustic lenses for ultrasound hyperthermia

Multipoint foci have been synthesized by applying the pseudoinverse field conjugation method to a single ultrasonic transducer coupled to a polystyrene lens. The lens design is based on phased array calculations are then fabricated on a computer-controlled milling machine. The measured beam patterns...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 1993-09, Vol.40 (5), p.592-602
Main Authors: Lalonde, R.J., Worthington, A., Hunt, J.W.
Format: Article
Language:English
Subjects:
Acoustic beams
Acoustic measurements
Biological and medical sciences
Hyperthermia
Lenses
Medical sciences
Metalworking machines
Optical design
Phased arrays
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Technology. Biomaterials. Equipments
Temperature distribution
Ultrasonic imaging
Ultrasonic transducers
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Summary:Multipoint foci have been synthesized by applying the pseudoinverse field conjugation method to a single ultrasonic transducer coupled to a polystyrene lens. The lens design is based on phased array calculations are then fabricated on a computer-controlled milling machine. The measured beam patterns from the lenses agree closely with the beam patterns predicted by theory for the equivalent phased arrays. Temperature distributions from thermal modeling and those measured in tissue equivalent phantoms show that the lens system is capable of generating strongly localized, controlled temperature fields for hyperthermia.< >
ISSN:0885-3010
1525-8955
DOI:10.1109/58.238113