Validation of eyelids as acoustic receiver locations for photoacoustic-guided neurosurgery

2021 ◽  
Author(s):  
Michelle Graham ◽  
Francis X. Creighton ◽  
Muyinatu Bell
Keyword(s):  
Acoustic Receiver

scholarly journals Field validation of imaging an adjacent borehole using scattered P-waves

2020 ◽  
Vol 17 (5) ◽  
pp. 1272-1280
Author(s):  
Jian-Lin Ben ◽  
Wen-Xiao Qiao ◽  
Xiao-Hua Che ◽  
Xiao-Dong Ju ◽  
Jun-Qiang Lu ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Phased Array ◽  
Test Results ◽  
Field Validation ◽  
Geologic Structure ◽  
P Waves ◽  
Acoustic Reflection ◽  
Acoustic Receiver ◽  
Logging Tool ◽  
Array Receiver

Abstract Acoustic waves enter a rock formation from a borehole and are reflected or scattered upon encountering a geologic structure. Consequently, we obtain the structure location represented by the azimuth and distance from the borehole using the acoustic reflection or scattering. Downhole acoustic measurements with the azimuthal resolution are realized using an azimuthal acoustic receiver sonde composed of several arcuate phased array receivers. Eight sensors distributed evenly across the arcuate phased array receiver can record acoustic waves independently; this allows us to adopt the beamforming method. We use a supporting logging tool to conduct the downhole test in two adjacent fluid-filled boreholes, for validating the evaluation of the geologic structure using scattered P-waves. The test results show the multi-azimuth images of the target borehole and the azimuthal variation in scattering amplitudes. Thus, we obtain the precise location of the target borehole. Furthermore, the measured values of the target borehole are consistent with the actual values, indicating that we can accurately evaluate a near-borehole geologic structure with scattered P-waves.

scholarly journals Proof of Concept for an Intracochlear Acoustic Receiver for Use in Acute Large Animal Experiments

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3565 ◽  
Author(s):  
Flurin Pfiffner ◽  
Lukas Prochazka ◽  
Ivo Dobrev ◽  
Karina Klein ◽  
Patrizia Sulser ◽  
...  
Keyword(s):  
Animal Experiments ◽  
Ease Of Use ◽  
Published Data ◽  
Large Animal ◽  
Proof Of Concept ◽  
Anatomy And Physiology ◽  
In Vivo Experiments ◽  
Acoustic Receiver ◽  
Live Specimen

(1) Background: The measurement of intracochlear sound pressure (ICSP) is relevant to obtain better understanding of the biomechanics of hearing. The goal of this work was a proof of concept of a partially implantable intracochlear acoustic receiver (ICAR) fulfilling all requirements for acute ICSP measurements in a large animal. The ICAR was designed not only to be used in chronic animal experiments but also as a microphone for totally implantable cochlear implants (TICI). (2) Methods: The ICAR concept was based on a commercial MEMS condenser microphone customized with a protective diaphragm that provided a seal and optimized geometry for accessing the cochlea. The ICAR was validated under laboratory conditions and using in-vivo experiments in sheep. (3) Results: For the first time acute ICSP measurements were successfully performed in a live specimen that is representative of the anatomy and physiology of the human. Data obtained are in agreement with published data from cadavers. The surgeons reported high levels of ease of use and satisfaction with the system design. (4) Conclusions: Our results confirm that the developed ICAR can be used to measure ICSP in acute experiments. The next generation of the ICAR will be used in chronic sheep experiments and in TICI.

Experimental study on the performance of an azimuthal acoustic receiver sonde for a downhole tool

2016 ◽  
Vol 65 (1) ◽  
pp. 158-169 ◽  
Author(s):  
Xiaohua Che ◽  
Wenxiao Qiao ◽  
Xiaodong Ju ◽  
Jinping Wu ◽  
Baiyong Men
Keyword(s):  
Experimental Study ◽  
Acoustic Receiver ◽  
Downhole Tool

scholarly journals The need for aquatic tracking networks: the Permanent Belgian Acoustic Receiver Network

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Jan Reubens ◽  
Pieterjan Verhelst ◽  
Inge van der Knaap ◽  
Benny Wydooghe ◽  
Tanja Milotic ◽  
...  
Keyword(s):  
Acoustic Receiver

Design of a stability-detecting device for dental implants

2005 ◽  
Vol 219 (3) ◽  
pp. 203-211 ◽  
Author(s):  
H-M Huang ◽  
K-Y Cheng ◽  
C-F Chen ◽  
K-L Ou ◽  
C-T Lin ◽  
...  
Keyword(s):  
Animal Models ◽  
Dental Implant ◽  
Bone Healing ◽  
Test Apparatus ◽  
Implant Stability ◽  
Left Tibia ◽  
Vibrational Signals ◽  
Acoustic Receiver ◽  
Rf Values

Resonance frequency (RF) analysis technology was used to design a dental implant stability detector. The device uses a miniature-sized electromagnetic triggering rod to elicit vibration in a dental implant. Vibrational signals were recorded via an acoustic receiver. To assess the in vivo performance of the test apparatus, animal models were used. Implants were placed in the left tibia of 12 rabbits using a conventional surgical procedure. Standard 3.2 mm × 8 mm implants were placed in each test tibia with pre-tapping cavities of 3.2 mm and 3.7 mm diameters to simulate either a ‘well-fitting’ or a ‘loosely fitting’ situation. The RF values of the test implants were detected by the newly developed device which was directly mounted on the healing abutments of the implants. The results showed that the RF values of the implants under well-fitting conditions significantly increased (p<0.01) 3 weeks after surgery and reached a plateau at around 6-7 weeks. Meanwhile implants with higher initial RF values had shorter healing times and higher final RF values at the plateau. Based on these findings, it was concluded that the idea of using the current designed device for detecting the degree of bone healing during the osseointegration process seems feasible.

A MEMS Condenser Microphone-Based Intracochlear Acoustic Receiver

2017 ◽  
Vol 64 (10) ◽  
pp. 2431-2438 ◽  
Author(s):  
Flurin Pfiffner ◽  
Christof Roosli ◽  
Dominik Obrist ◽  
Alexander Huber ◽  
Lukas Prochazka ◽  
...  
Keyword(s):  
Condenser Microphone ◽  
Acoustic Receiver
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