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A Theragnostic HIFU Transducer and System for Inherently Registered Imaging and Therapy
A Theragnostic HIFU Transducer and System for Inherently Registered Imaging and Therapy
A Theragnostic HIFU Transducer and System for Inherently Registered Imaging and Therapy
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Objective: One big challenge with high intensity focused ultrasound (HIFU) is the difficulty in accurate prediction of focal location due to the complex wave propagation in heterogeneous medium even with imaging guidance. This study aims to overcome this by combining therapy and imaging guidance with one single HIFU transducer using the vibro-acoustography (VA) strategy. Methods: Based on the VA imaging method, a HIFU transducer consisting of 8 transmitting elements was proposed for therapy planning, treatment and evaluation. Inherent registration between the therapy and imaging created unique spatial consistence in HIFU transducer's focal region in the above three procedures. Performance of this imaging modality was first evaluated through in-vitro phantoms. In-vitro and ex-vivo experiments were then designed to demonstrate the proposed dual-mode system's ability in conducting accurate thermal ablation. Results: Point spread function of the HIFU-converted imaging system had a full wave halfmaximumof about 1.2mmin both directions at a transmitting frequency of 1.2 MHz, which outperformed the conventional ultrasound imaging (3.15 MHz) in in-vitro situation. Image contrast was also tested on the in-vitro phantom. Various geometric patterns could be accurately 'burned out' on the testing objects by the proposed system both in vitro and ex vivo. Conclusion: Implementation of imaging and therapy with one HIFU transducer in this manner is feasible and it has potential as a novel strategy for addressing the long-standing problem in the HIFU therapy, possibly pushing this non-invasive technique forward towards wider clinical applications. Index Terms—Dual-mode HIFU system, high intensity focused ultrasound, surgery planning and evaluation, vibroacoustography imaging.
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1 Objective: One big challenge with high intensity focused ultrasound (HIFU) is the difficulty in accurate prediction of focal location due to the complex wave propagation in heterogeneous medium even with imaging guidance. 2 This study aims to overcome this by combining therapy and imaging guidance with one single HIFU transducer using the vibro-acoustography (VA) strategy. 3 Methods: Based on the VA imaging method, a HIFU transducer consisting of 8 transmitting elements was proposed for therapy planning, treatment and evaluation. 4 Inherent registration between the therapy and imaging created unique spatial consistence in HIFU transducer's focal region in the above three procedures. 5 Performance of this imaging modality was first evaluated through in-vitro phantoms. 6 In-vitro and ex-vivo experiments were then designed to demonstrate the proposed dual-mode system's ability in conducting accurate thermal ablation. 7 Results: Point spread function of the HIFU-converted imaging system had a full wave halfmaximumof about 1.2mmin both directions at a transmitting frequency of 1.2 MHz, which outperformed the conventional ultrasound imaging (3.15 MHz) in in-vitro situation. 8 Image contrast was also tested on the in-vitro phantom. 9 Various geometric patterns could be accurately 'burned out' on the testing objects by the proposed system both in vitro and ex vivo. 10 Conclusion: Implementation of imaging and therapy with one HIFU transducer in this manner is feasible and it has potential as a novel strategy for addressing the long-standing problem in the HIFU therapy, possibly pushing this non-invasive technique forward towards wider clinical applications. 11 Index Terms—Dual-mode HIFU system, high intensity focused ultrasound, surgery planning and evaluation, vibroacoustography imaging.