A Tikhonov Regularization Scheme for Focus Rotations with Focused Ultrasound Phased Arrays

Phased arrays have a wide range of applications in focused ultrasound therapy. By using an array of individuallydriven transducer elements, it is possible to steer a focus through space electronically and compensate for acoustically heterogeneous media with phase delays. In this paper, the concept o...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2016-09
Main Authors: Hughes, Alec, Hynynen, Kullervo
Format: Article
Language:English
Online Access:Get full text
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Summary:Phased arrays have a wide range of applications in focused ultrasound therapy. By using an array of individuallydriven transducer elements, it is possible to steer a focus through space electronically and compensate for acoustically heterogeneous media with phase delays. In this paper, the concept of focusing an ultrasound phased array is expanded to include a method to control the orientation of the focus using a Tikhonov regularization scheme. It is then shown that the Tikhonov regularization parameter used to solve the ill-posed focus rotation problem plays an important role in the balance between quality focusing and array efficiency. Finally, the technique is applied to the synthesis of multiple foci, showing that this method allows for multiple independent spatial rotations.
ISSN:1525-8955