Dual-frequency piezoelectric micromachined ultrasound transducer based on polarization switching in ferroelectric thin film DOI Creative Commons
Byung Chul Lee, Jin Soo Park,

Soo Young Jung

et al.

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: April 11, 2023

Abstract Dual-frequency ultrasound has advantages over conventional ultrasound, which operates at a specific frequency band, due to its additional response. Moreover, tunable from single transducer enables sonographers achieve images with large detection area and high resolution. This facilitates the availability of more advanced techniques that require low- simultaneously such as harmonic imaging image-guided therapy. In this article, we present novel method for dual-frequency generation ferroelectric piezoelectric micromachined (PMUT). Uniformly designed arrays can be used both deep low-resolution shallow high-resolution imaging. To switch frequency, only requirement is tune DC bias controlling polarization state film. Flextensional vibration PMUT’s membrane strongly depends on state, producing high-frequency excitation frequency. strategy dispenses either multi-electrode configurations or hetero-designed elements, are integrated into an array. Consequently, technique significantly reduces design complexity their associated driving circuits.

Language: Английский

A high magnetic resonance imaging (MRI) contrast agar/silica-based phantom for evaluating focused ultrasound (FUS) protocols DOI
Antria Filippou, Nikolas Evripidou, Christakis Damianou

et al.

Physica Medica, Journal Year: 2025, Volume and Issue: 131, P. 104932 - 104932

Published: Feb. 11, 2025

Language: Английский

Citations

0
Dual-frequency piezoelectric micromachined ultrasound transducer based on polarization switching in ferroelectric thin films DOI Creative Commons
Jin Soo Park,

Soo Young Jung,

Dong Hun Kim

et al.

Microsystems & Nanoengineering, Journal Year: 2023, Volume and Issue: 9(1)

Published: Oct. 2, 2023

Abstract Due to its additional frequency response, dual-frequency ultrasound has advantages over conventional ultrasound, which operates at a specific band. Moreover, tunable from single transducer enables sonographers achieve images with large detection area and high resolution. This facilitates the availability of more advanced techniques that simultaneously require low- high-frequency ultrasounds, such as harmonic imaging image-guided therapy. In this study, we present novel method for generation ferroelectric piezoelectric micromachined (PMUT). Uniformly designed arrays can be used both deep low-resolution shallow high-resolution imaging. To switch frequency, only requirement is tune DC bias control polarization state film. Flextensional vibration PMUT membrane strongly depends on state, producing ultrasounds excitation frequency. strategy meets either multielectrode configurations or heterodesigned elements, are integrated into an array. Consequently, technique significantly reduces design complexity their associated driving circuits.

Language: Английский

Citations

7
High-Accuracy Neuro-Navigation with Computer Vision for Frameless Registration and Real-Time Tracking DOI Creative Commons
Isabella Chiurillo, Raahil M. Sha, Faith C. Robertson

et al.

Bioengineering, Journal Year: 2023, Volume and Issue: 10(12), P. 1401 - 1401

Published: Dec. 7, 2023

For the past three decades, neurosurgeons have utilized cranial neuro-navigation systems, bringing millimetric accuracy to operating rooms worldwide. These systems require an room team, anesthesia, and, most critically, fixation. As a result, treatments for acute neurosurgical conditions, performed urgently in emergency or intensive care units on awake and non-immobilized patients, not benefited from traditional neuro-navigation. emergent procedures are freehand, guided only by anatomical landmarks with no navigation, resulting inaccurate catheter placement neurological deficits. A rapidly deployable image-guidance technology that offers highly accurate, real-time registration is capable of tracking awake, moving patients needed improve patient safety. The Zeta Cranial Navigation System currently non-fiducial-based, FDA-approved device performs continuous tracking. To assess this system's performance, we phantoms human cadaver heads during controlled motions various adverse surgical test conditions. obtained sub-millimetric target surface accuracy. This rapid accurate frameless system mobile subjects can enhance bedside procedure safety expand range interventions high levels outside room.

Language: Английский

Citations

2
Estimation of the Proton Resonance Frequency Coefficient in Agar-based Phantoms DOI Creative Commons
Antria Filippou, Nikolas Evripidou, Andreas Georgiou

et al.

Journal of Medical Physics, Journal Year: 2024, Volume and Issue: 49(2), P. 167 - 180

Published: April 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.

Language: Английский

Citations

0
Elucidating viscoelastic effects on focused ultrasound thermal therapy with acoustic-solid-thermal coupling analysis DOI
Zhibo Du,

Haolong Chen,

W. Li

et al.

Acta Mechanica Sinica, Journal Year: 2024, Volume and Issue: 41(2)

Published: Aug. 22, 2024

Language: Английский

Citations

0
Dual-frequency piezoelectric micromachined ultrasound transducer based on polarization switching in ferroelectric thin film DOI Creative Commons
Byung Chul Lee, Jin Soo Park,

Soo Young Jung

et al.

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: April 11, 2023

Abstract Dual-frequency ultrasound has advantages over conventional ultrasound, which operates at a specific frequency band, due to its additional response. Moreover, tunable from single transducer enables sonographers achieve images with large detection area and high resolution. This facilitates the availability of more advanced techniques that require low- simultaneously such as harmonic imaging image-guided therapy. In this article, we present novel method for dual-frequency generation ferroelectric piezoelectric micromachined (PMUT). Uniformly designed arrays can be used both deep low-resolution shallow high-resolution imaging. To switch frequency, only requirement is tune DC bias controlling polarization state film. Flextensional vibration PMUT’s membrane strongly depends on state, producing high-frequency excitation frequency. strategy dispenses either multi-electrode configurations or hetero-designed elements, are integrated into an array. Consequently, technique significantly reduces design complexity their associated driving circuits.

Language: Английский

Citations

0