Towards ultrasound wearable technology for cardiovascular monitoring: from device development to clinical validation

Опубликована: Апрель 8, 2024

Язык: Английский

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Effect of Magnetic Resonance Imaging on the Motion Accuracy of Magnetic Resonance Imaging-compatible Focused Ultrasound Robotic System

Journal of Medical Physics, Год журнала: 2024, Номер 49(2), С. 203 - 212

Опубликована: Апрель 1, 2024

Purpose: The current study provides insights into the challenges of safely operating a magnetic resonance imaging (MRI)-guided focused ultrasound (MRgFUS) robotic system in high-field MRI scanner terms motion accuracy. Materials and Methods: Grid sonications were carried out phantoms excised porcine tissue 3T using an existing MRgFUS system. Fast low-angle shot-based thermometry was employed for intraprocedural monitoring thermal distribution. Results: Strong shifting heated spots from intended points observed owing to electromagnetic interference (EMI)-induced malfunctions system’s operation. Increasing slice thickness sequence at least 8 mm proven efficient method preserving Conclusions: These findings raise awareness about EMI effects on accuracy devices how they can be mitigated by employing suitable parameters.

Язык: Английский

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Estimation of the Proton Resonance Frequency Coefficient in Agar-based Phantoms

Journal of Medical Physics, Год журнала: 2024, Номер 49(2), С. 167 - 180

Опубликована: Апрель 1, 2024

Aim: Agar-based phantoms are popular in high intensity focused ultrasound (HIFU) studies, with magnetic resonance imaging (MRI) preferred for guidance since it provides temperature monitoring by proton frequency (PRF) shift (MR) thermometry. MR thermometry depends on several factors, thus, herein, the PRF coefficient of agar was estimated. Materials and Methods: Seven were developed varied (2, 4, or 6% w/v) constant (6% silica concentrations 6, 8% to assess effect concentration coefficient. Each phantom sonicated using acoustical power a 30 s duration both laboratory setting inside 3T MRI scanner. coefficients estimated through linear trends between phase acquired gradient sequences thermocouple-based temperatures changes. Results: Linear regression ( R 2 = 0.9707–0.9991) demonstrated proportional dependency change, resulting −0.00336 ± 0.00029 −0.00934 0.00050 ppm/°C various recipes. Weak negative correlations observed increased agar. With concentrations, correlation strong. For all phantoms, calibrated resulted 1.01–3.01-fold higher changes compared values calculated literature Conclusions: Phantoms w/v doped 0%–8% best resemble tissue should be HIFU studies. The can result enhanced evaluation protocols.

Язык: Английский

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Angle of polarized light (AOP) Property for optical classification of the crosslinked polymer

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, Год журнала: 2024, Номер 330, С. 125503 - 125503

Опубликована: Дек. 3, 2024

Язык: Английский

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Ultrasonic attenuation of canine mammary tumours

Ultrasonics, Год журнала: 2022, Номер 125, С. 106798 - 106798

Опубликована: Июнь 30, 2022

Язык: Английский

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