A 45 TO 55 Mhz Needle-Based Ultrasound System for Invasive Imaging

1993 ◽  
Vol 15 (1) ◽  
pp. 1-13 ◽  
Author(s):  
G. R. Lockwood ◽  
L. K. Ryan ◽  
F. S. Foster
Keyword(s):  
Lead Zirconate Titanate ◽  
High Frequency ◽  
Imaging System ◽  
Lead Zirconate ◽  
Parabolic Mirror ◽  
Axial Resolution ◽  
Stainless Steel Needle ◽  
Ultrasound System ◽  
Design Construction

The design, construction and fabrication of a high frequency needle-based ultrasound imaging system is described. A miniature lead zirconate titanate transducer was mounted opposite a parabolic mirror in a stainless steel needle. By inserting the needle into a tissue, a cross section image of the tissue can be made. Two needle probes were built, a 45 MHz 2.8 mm diameter probe with 125 μm lateral, 55 μm axial resolution and a 55 MHz 1.6 mm diameter probe with 105 μm lateral, 40 μm axial resolution. Preliminary phantom and in vitro tissue images demonstrate the feasibility of high frequency needle-based imaging.

Porous lead zirconate titanate ceramics with optimized acoustic properties for high-frequency ultrasonic transducer applications

2017 ◽  
Vol 142 (4) ◽  
pp. 2576-2576 ◽  
Author(s):  
Marc Lethiecq ◽  
Danjela Kuscer ◽  
Julien Bustillo ◽  
Andre-Pierre Abellard ◽  
Tina Bakaric ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
High Frequency ◽  
Ultrasonic Transducer ◽  
Lead Zirconate ◽  
Acoustic Properties ◽  
Zirconate Titanate ◽  
Titanate Ceramics

A Novel Method to Attenuate Protein Adsorption Using Combinations of Polyethylene Glycol (PEG) Grafts and Piezoelectric Actuation

2010 ◽  
Vol 1 (4) ◽  
Author(s):  
Po-Ying Yeh ◽  
Jayachandran N. Kizhakkedathu ◽  
Mu Chiao
Keyword(s):  
Polyethylene Glycol ◽  
Protein Adsorption ◽  
Lead Zirconate Titanate ◽  
Photoelectron Spectroscopy ◽  
Theoretical Calculations ◽  
Lead Zirconate ◽  
Piezoelectric Composite ◽  
Coated Surfaces ◽  
Bsa Adsorption

An antifouling treatment based on the combined effects of grafted polyethylene glycol (PEG) polymers and the application of vibration is reported. A gold-coated lead zirconate titanate piezoelectric composite was grafted with PEG used as a model substrate. The PEG grafted surfaces were thoroughly characterized by attenuated total reflectance-Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. In vitro protein adsorption onto PEG coated surfaces was studied with and without the application of vibration. Bovine serum albumin (BSA) adsorption onto PEG grafted surfaces followed a similar pattern as reported in literature. However, when piezoelectric vibration was applied on the PEG grafted surface, BSA desorption was observed. At very low graft densities, the vibration significantly reduced the BSA adsorption compared with high PEG graft densities. Theoretical calculations showed that the thickness of PEG layer on the surface was affecting vibration induced protein desorption.

scholarly journals Self-separated hydrothermal lead zirconate titanate thick films for high frequency transducer applications

2009 ◽  
Vol 94 (10) ◽  
pp. 102901 ◽  
Author(s):  
B. P. Zhu ◽  
Q. F. Zhou ◽  
J. Shi ◽  
K. K. Shung ◽  
S. Irisawa ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
High Frequency ◽  
Thick Films ◽  
Lead Zirconate ◽  
Zirconate Titanate ◽  
Frequency Transducer ◽  
High Frequency Transducer

A Study on Long-Term In Vitro Reliability of Intracochlear Lead-Zirconate-Titanate Microactuators

2018 ◽  
Vol 1 (3) ◽  
Author(s):  
Yifeng Liu ◽  
Chuan Luo ◽  
G. Z. Cao ◽  
Clifford R. Hume ◽  
I. Y. Shen
Keyword(s):  
Lead Zirconate Titanate ◽  
Electrical Breakdown ◽  
Failure Mechanisms ◽  
Electrode Array ◽  
Lead Zirconate ◽  
Acoustic Stimulation ◽  
Structural Failure ◽  
Significant Drop ◽  
Zirconate Titanate

An intracochlear lead-zirconate-titanate (PZT) microactuator integrated with a cochlear implant electrode array could be a feasible strategy to implement combined electric and acoustic stimulation inside the cochlea. The purpose of this paper is to characterize in vitro a prototype PZT microactuator for intracochlear applications, including service life, failure mechanisms, and lead leaching. PZT microactuators were driven sinusoidally to failure in air and in artificial perilymph. Frequency response functions (FRFs) and electrical impedance were monitored. After the PZT microactuators failed, the amount of leached lead was measured via inductive coupled plasma mass spectrometry (ICP-MS). Two failure mechanisms are identified: electrical breakdown and structural failure. The electrical breakdown, possibly from loss of parylene encapsulation, is evidenced by a sudden and significant drop of the actuators' electrical resistance. The structural failure, possibly from electrode delamination, is evidenced by a sudden and significant drop of FRFs. The amount of lead leached from the PZT microactuator is well below published safety guidelines from federal agencies.

A nonlinear ultrasonic method for real-time bolt looseness monitoring using PZT transducer–enabled vibro-acoustic modulation

2019 ◽  
Vol 31 (3) ◽  
pp. 364-376 ◽  
Author(s):  
Nan Zhao ◽  
Linsheng Huo ◽  
Gangbing Song
Keyword(s):  
Real Time ◽  
Lead Zirconate Titanate ◽  
High Frequency ◽  
Ultrasonic Method ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Modulation Method ◽  
Nonlinear Ultrasonic ◽  
Acoustic Modulation ◽  
Nonlinear Ultrasonic Method

A real-time nonlinear ultrasonic method based on vibro-acoustic modulation is applied to monitor early bolt looseness quantitatively by using piezoceramic transducers. In addition to the ability to detect the early bolt looseness, a major contribution is that we replaced the shaker, which is commonly used in a vibro-acoustic modulation method, by a permanently installed and low-cost lead zirconate titanate patch. In vibro-acoustic modulation, when stimulating two input waves with distinctive frequencies, namely the high-frequency probing wave and the low-frequency pumping wave, the high-frequency probing wave will be modulated by the low-frequency pumping wave to generate sidebands in terms of bolt looseness. Thus, the influence of low-frequency voltage amplitudes on the modulation results, which is ambiguous in previous research, is also analyzed in this article. The results of experiment demonstrated that the lead zirconate titanate–enabled vibro-acoustic modulation method is reliable and easy to implement to identify the bolt looseness continuously and quantitatively. In addition, low-frequency amplitudes of actuating voltage should be selected in a reasonable range. Finally, we compared the vibro-acoustic modulation method with the time-reversal method based on the linear ultrasonic theory, and the result illustrates that vibro-acoustic modulation method has better performance in monitoring the early bolt looseness.

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