Topics

HIFU Power Monitoring Using Combined Instantaneous Current and Voltage Measurement.

08:00 EDT 12th September 2019 | BioPortfolio

Summary of "HIFU Power Monitoring Using Combined Instantaneous Current and Voltage Measurement."

During HIFU therapy it is important that the electrical power delivered to the transducer is monitored to avoid under or over exposure, ensure patient safety and to protect the transducer itself. Due to ease of measurement, the transducer's potential difference may be as an indicator of power delivery. However, even when a transducer's complex impedance is well characterised at small amplitudes and matching networks are used, voltage-only (VO) monitoring cannot account for the presence of drive waveform distortion, changes to the acoustic path or damage to the transducer. In this study, combined current and voltage (CCV) is proposed as an MRI-compatible, miniature alternative to bi-directional power couplers that is compatible with switched amplifiers. For CCV power measurement, current probe data was multiplied by the voltage waveform and integrated in the frequency domain. Transducer efficiency was taken into account to predict acoustic power. The technique was validated with a radiation force balance (RFB). When using a typical HIFU transducer and amplifier, VO predictions and acoustic power had a maximum difference of 20%. However, under the same conditions, CCV only had a maximum difference of 5%. The technique was applied to several lesioning experiments and it was shown that when VO was used as a control between two amplifiers there was up to a 38% difference in lesion area. This greatly reduced to a maximum of 5% once CCV was used instead. These results demonstrate that CCV can accurately predict real-time electrical power delivery leading to safer HIFU treatments.

Affiliation

Journal Details

This article was published in the following journal.

Name: IEEE transactions on ultrasonics, ferroelectrics, and frequency control
ISSN: 1525-8955
Pages:

Links

DeepDyve research library

PubMed Articles [14771 Associated PubMed Articles listed on BioPortfolio]

Evaluating HIFU-Mediated Local Drug Release Using Thermal Strain Imaging: Phantom and Preliminary in-vivo Studies.

High-intensity focused ultrasound (HIFU) mediated drug release becomes a promising therapeutic technique for treatment of cancers, which has merits of deep penetration, non-invasive approach and non-i...

Power Factor Compensation Using Teaching Learning Based Optimization and Monitoring System by Cloud Data Logger.

The main objective of this paper is to compensate power factor using teaching learning based optimization (TLBO), determine the capacitor bank optimization (CBO) algorithm, and monitor a system in rea...

A Power Supply Technology for a Low-Power Online Monitoring Sensor Based on Electric Field Induction.

In order to provide a safe and stable power supply for low-power online monitoring sensors of transmission lines, a method of harvesting space electric field energy by using the impedance conversion c...

Real-time monitoring of sediment bulking through a multi-anode sediment microbial fuel cell as reliable biosensor.

Sediment bulking was closely related to the occurrence of black water agglomerate in anoxic aquatic sediments. Real-time monitoring of sediment bulking can be labor intensive and technically difficult...

Electro-dewatering of sewage sludge: Influence of combined action of constant current and constant voltage on performance and energy consumption.

In this study, mechanically-dewatered sludge was used to investigate the effect of electro-dewatering (EDW) under two electrical modes, which are constant current mode followed by constant voltage mod...

Clinical Trials [7118 Associated Clinical Trials listed on BioPortfolio]

HIFU Hemi-ablation Combined With Short-term Androgen Deprivation Therapy for Localized Prostate Cancer.

The current study aims to examine the hypothesis that combining the focal effects of HIFU with the systemic effects of androgen deprivation therapy might eradicate the prostatic cancer cel...

HIFU Reapplication in Benign Nodules

High Intensity Focused Ultrasound (HIFU) is a new approach in treating benign thyroid nodule without surgery. It is proven effective and safe relative to traditional surgery. From previous...

Effects of High Voltage Pulsed Current (HVPC) and Low Level Laser Therapy (LLLT) on Wound Healing in Diabetic Ulcers

The purpose of this study was to compare the effects of high voltage pulsed current and low level laser therapy on the healing process of diabetic foot ulcers.

A Trial Comparing USG-HIFU vs AS in Management of Low-risk PTMC

Papillary thyroid microcarcinoma (PTMC) is a common tumor in Hong Kong. Early immediate surgery has traditionally been recommended. However, given its excellent prognosis, some have recomm...

Presurgical Evaluation of Skin Cancers Using HIFU

1. To ensure complete elimination of lesions with maximum preservation of function and aesthetics. 2. To elaborate the Ultrasonographic features of skin cancers. 3. To det...

Medical and Biotech [MESH] Definitions

An electrophysiologic technique for studying cells, cell membranes, and occasionally isolated organelles. All patch-clamp methods rely on a very high-resistance seal between a micropipette and a membrane; the seal is usually attained by gentle suction. The four most common variants include on-cell patch, inside-out patch, outside-out patch, and whole-cell clamp. Patch-clamp methods are commonly used to voltage clamp, that is control the voltage across the membrane and measure current flow, but current-clamp methods, in which the current is controlled and the voltage is measured, are also used.

Optical imaging techniques used for recording patterns of electrical activity in tissues by monitoring transmembrane potentials via FLUORESCENCE imaging with voltage-sensitive fluorescent dyes.

An electrochemical technique for measuring the current that flows in solution as a function of an applied voltage. The observed polarographic wave, resulting from the electrochemical response, depends on the way voltage is applied (linear sweep or differential pulse) and the type of electrode used. Usually a mercury drop electrode is used.

Electronic devices that increase the magnitude of a signal's power level or current.

Devices that control the supply of electric current for running electrical equipment.

Quick Search


DeepDyve research library

Relevant Topics

Public Health
Alternative Medicine Cleft Palate Complementary & Alternative Medicine Congenital Diseases Dentistry Ear Nose & Throat Food Safety Geriatrics Healthcare Hearing Medical Devices MRSA Muscular Dyst...

Radiology
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...


Searches Linking to this Article