Narrative review of tissue-mimicking materials for MRI phantoms: Composition, fabrication, and relaxation properties

Radiography, Journal Year: 2024, Volume and Issue: 30(6), P. 1655 - 1668

Published: Oct. 1, 2024

Language: Английский

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Preclinical robotic device for magnetic resonance imaging guided focussed ultrasound

International Journal of Medical Robotics and Computer Assisted Surgery, Journal Year: 2022, Volume and Issue: 19(1)

Published: Sept. 28, 2022

A robotic device featuring three motion axes was manufactured for preclinical research on focussed ultrasound (FUS). The comprises a 2.75 MHz single element ultrasonic transducer and is guided by Magnetic Resonance Imaging (MRI).The compatibility of the with MRI evaluated estimating influence signal-to-noise ratio (SNR). efficacy in generating ablative temperatures phantoms excised porcine tissue.System's activation scanner reduced SNR to an acceptable level without compromising image quality. demonstrated efficient heating ability as proved MR thermometry. Discrete overlapping thermal lesions were inflicted tissue.The FUS system proven effective applications setting. It can thus be used multiple emerging MRI-guided technology. scaled-up human use minor modifications.

Language: Английский

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Experimental evaluation of the near-field and far-field heating of focused ultrasound using the thermal dose concept

Ultrasonics, Journal Year: 2021, Volume and Issue: 116, P. 106513 - 106513

Published: July 15, 2021

Language: Английский

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Development of an US, MRI, and CT imaging compatible realistic mouse phantom for thermal ablation and focused ultrasound evaluation

Ultrasonics, Journal Year: 2023, Volume and Issue: 131, P. 106955 - 106955

Published: Feb. 23, 2023

Language: Английский

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Agar-based Phantom for Evaluating Targeting of High-intensity Focused Ultrasound Systems for Breast Ablation

Journal of Medical Physics, Journal Year: 2024, Volume and Issue: 49(3), P. 343 - 355

Published: July 1, 2024

Aim: Phantoms are often utilized for the preclinical evaluation of novel high-intensity focused ultrasound (HIFU) systems, serving as valuable tools validating efficacy. In present study, feasibility a homogeneous agar-based breast-shaped phantom tool HIFU systems dedicated to breast cancer was assessed. Specifically, effect increased curvature on temperature increase examined through sonications executed two sides having varied curvatures. Materials and Methods: Assessment performed utilizing 1.1 MHz transducer. Sonications were at acoustical power in both laboratory setting inside 1.5 T magnetic resonance imaging scanner. independently identical phantoms repeatability purposes. Results: Temperature changes between 7.1°C–34.3°C 5.1°C–21.5°C recorded within decreased sides, respectively, 3.75–10 W. High-power created lesions which approximately symmetrically formed around focal point side, while they shifted away from side. Conclusions: The findings indicate that results deformed shapes temperatures induced area, thus suggesting treatment correction requirements form focus control or accurate robotic movement. developed can be an since it visually verify efficacy any system.

Language: Английский

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Characterization of a fat tissue mimicking material for high intensity focused ultrasound applications

Journal of Ultrasound, Journal Year: 2022, Volume and Issue: 26(2), P. 505 - 515

Published: Nov. 21, 2022

Language: Английский

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Phantom‐based assessment of motion and needle targeting accuracy of robotic devices for magnetic resonance imaging‐guided needle biopsy

International Journal of Medical Robotics and Computer Assisted Surgery, Journal Year: 2023, Volume and Issue: 19(5)

Published: May 11, 2023

Abstract Background The current study proposes simple methods for assessing the performance of robotic devices intended Magnetic Resonance Imaging (MRI)‐guided needle biopsy. Methods In‐house made agar‐based breast phantoms containing biopsy targets served as main tool in evaluation process an MRI compatible positioning device comprising a navigator. motion accuracy mechanical stages was assessed by calliper measurements. Laboratory targeting included repeatability phantom test and laser‐based method. also MRI. Results maximum error linear steps up to 10 mm 0.1 mm. Needle navigation relative alignment with various were performed successfully both laboratory settings. proposed offered tissue‐like signal good haptic feedback during insertion. Conclusions could be valuable validating MRI‐guided real environments.

Language: Английский

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High-frequency ultrasound-based thickness measurement of highly attenuating materials

Measurement Science and Technology, Journal Year: 2022, Volume and Issue: 34(3), P. 035004 - 035004

Published: Nov. 5, 2022

Abstract This paper investigates an effective method for measuring the thickness of highly attenuating materials using acoustic radiation-induced quasi-static component (QSC) a primary longitudinal wave (PLW) at high frequency. The generated QSC features lower attenuation than high-frequency PLW, so pulse with zero carrier frequency can propagate longer distance same group velocity, even in materials. In addition, based on PLW has better directivity low-frequency PLW-based method, making it more suitable attenuated material local measurement. be accurately measured by pulse-echo time-of-flight ultrasound technique. experimental examinations conducted silicone rubber blocks different thicknesses demonstrate that their QSC-based method. provides measurements

Language: Английский

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MRI compatibility testing of commercial high intensity focused ultrasound transducers

Physica Medica, Journal Year: 2023, Volume and Issue: 117, P. 103194 - 103194

Published: Dec. 3, 2023

Language: Английский

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Feasibility of Ultrasonic Heating through Skull Phantom Using Single-element Transducer

Journal of Medical Ultrasound, Journal Year: 2023, Volume and Issue: 32(1), P. 32 - 40

Published: Aug. 3, 2023

Abstract Background: Noninvasive neurosurgery has become possible through the use of transcranial focused ultrasound (FUS). This study assessed heating ability single element spherically transducers operating at 0.4 and 1.1 MHz three-dimensional (3D) printed thermoplastic skull phantoms. Methods: Phantoms with precise bone geometry a male patient were 3D using common materials following segmentation on computed tomography head scan image. The brain tissue was mimicked by an agar-based gel phantom developed in-house. selection mainly based transmission-through attenuation measurements. Phantom sonications performed water, then, phantoms intervening beam path. In each case, thermometry focal spot thermocouples. Results: temperature change in presence reduced to less than 20 % that recorded free field when transducer, whereas trans-skull sonication produced minimal or no temperature. transducer showed better performance transmission but still not efficient. Conclusion: inability both tested steer high attenuating raise focus confirmed, underlying necessity correction technique compensate for energy losses, such those provided phased arrays. proposed could be used as cost-effective ergonomic tool FUS preclinical studies.

Language: Английский

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