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ultra-fine tuning
摘要： Researchers from Xi’an University of Technology in China, alongside researchers from the ENSEIRB and the IERF in France, propose an auto-tuning network for a phased-array high intensity focused ultrasound (HIFU) system based on a variable synchronous switched capacitor. The novel system is capable of automatically compensating for the reactive power and impedance drifts, caused by temperature fluctuations and manufacturing errors, in circuit transducers and complies with magnetic resonance imaging (MRI) compatibility regulations.
关键词： phased-array,variable synchronous switched capacitor,high-intensity focused ultrasound,HIFU,Auto-tuning network,MRI compatibility
更新于2025-09-23 15:21:01
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Interventional Oncology (Principles and Practice of Image-Guided Cancer Therapy) || Principles of high-intensity focused ultrasound
摘要： High-intensity focused ultrasound (HIFU), also known as focused ultrasound (US), is a non-invasive image-guided therapy which has been primarily employed in the clinical realm for non-invasive thermal ablation of benign and malignant neoplasms. Real-time imaging guidance, treatment monitoring, and therapy control are achieved with either US or magnetic resonance imaging (MRI) guidance. HIFU clinical experience has been described in the treatment of leiomyomata (uterine fibroids), prostate (benign prostatic hypertrophy and cancer), breast, hepatic, renal, pancreatic, brain, and bone tumors, although for most of these tumors, relatively small numbers of treated patients have been described and widespread adoption of HIFU thermoablation remains limited. Ongoing technical challenges include the feasibility of treating large tumors within a finite treatment time, treating tumors prone to motion, and accessing targets when the acoustic window is restricted by intervening anatomy (e.g., ribs, bowel).
关键词： image-guided therapy,thermal ablation,HIFU,High-intensity focused ultrasound,non-invasive therapy
更新于2025-09-23 15:21:01
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Ultrasonic detection of high-intensity focused ultrasound field using quadrature point phase step in a fibre optic interferometric sensor
摘要： A compact low-temperature cross-talk all-fibre ultrasonic sensor based on quadrature point phase step is proposed and experimentally demonstrated for the detection of high-intensity focused ultrasound (HIFU). The end facet of the graded index fibre was microfabricated with a 3π/2 phase step, which forms an ultra-compact two-wave interferometer. The ultrasonic wave front can be simply detected with phase-front modulation. The all-fibre configuration allows the sensor to detect the HIFU field at a high intensity level. More importantly, the proposed sensor is virtually temperature-independent due to the ultra-thin phase step. The experimental results show that the ultrasonic sensor has a sensitivity of 324mV/MPa, and the standard variation of the temperature cross-sensitivity is only 1.7%. The proposed fibre sensor is expected to have potential applications in HIFU detection due to its tolerance at high intensity levels and low-temperature cross-sensitivity.
关键词： phase-front modulation,HIFU field,phase step,optical fibre ultrasound sensor
更新于2025-09-10 09:29:36