Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"Ultrasound Transducer"”.
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Automated Optimal Ultrasound Transducer Simulator
… increasing. However, the prototyping process of ultrasound devices can be incredibly costly. In order to save time, many researchers run simulations in order to analyze the performance of their prototypes to help guide their manufacturing decisions. Unfortunately, many of these simulations need …
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Design and fabrication of a flexible membrane ultrasound transducer
Wearable ultrasound sensing could enable novel medical diagnostics by facilitating continuous, real-time, and direct measurement of physiological phenomena, such as blood pressure. Currently, ultrasound is not used in wearable health sensing applications because clinical ultrasound systems are …
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Synthetic aperture sonar imaging using compressive sensing and an ultrasound transducer array
… system, the SAS data was captured in a multiple transducer (baseline), single-pass configuration with 15 ultrasonic receivers and a single ultrasonic transmitter that operate at about 40 kHz. Signal conditioning circuits for the transmit and receive signals were built on pieces of veroboard. A PC …
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Microfabrication and characterization of a new box-shaped high frequency (7.5 MHz) low aperture 2D phased ultrasound transducer array
… low aperture 2D phased sparse array ultrasonic transducer developed, built, and characterized. The capacity of matrix or 2D phased arrays to generate ultrasound beams without requiring any form of motion or mechanical steering holds potential value in the biomedical sonographic domain. However, …
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Novel ultrasonic transducers and array designs using self-similar fractal geometries
… bandwidth is an important requirement of an ultrasound transducer across many applications. Naturally occurring resonating systems utilise structures containing a range of length scales to produce a broad operating bandwidth. In this work, a novel concept of designing a piezoelectric …
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Biomedical ultrasonics, cavitation, and sonoporation
… cavitation and sonoporation. Focussed ultrasound surgery can heat tissue to a temperature that causes protein denaturation and coagulative necrosis. For high-resolution focused ultrasound microsurgery, high working frequencies are necessary. We manufactured a highfrequency, …
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An ultrasound probe sheathing device : design, development, and evaluation
During interventional ultrasound-guided procedures, sterility is maintained by covering the ultrasound transducer head and cord with a sterile sheath. The current sheathing technique is cumbersome, requires an assistant to complete, and poses a risk of tangling the probe cord and breaching the …
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Multiplexer Design for a Multi-Array Ultrasonic Imaging System
Conventional ultrasound data-acquisition platforms have a limited number of I/O channels, and thus cannot be directly interfaced with multiple ultrasound transducer arrays. A high-voltage multiplexer is designed to allow a 128-signal DAQ to interface with up to eighteen 128-signal arrays in a …
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Robotic ultrasound manipulator : calibration of position and orientation measurement system
… a fixture for holding and manipulating an ultrasound wand as adeptly as a trained technician. From the 2D slices recorded by an ultrasound transducer, a three-dimensional image can be reconstructed. To reconstruct the 3D image, position and orientation data are needed. In the interests of …
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Automatic Arterial Wall Detection and Diameter Tracking Using M-mode Ultrasound
… lumen diameter of the artery is proposed using ultrasound radio-frequency signals acquired with a single ultrasound transducer in M-mode.Detection of the region containing the artery walls is obtained using a machine learning trained classifier. Artery lumen diameter is estimated using peak …
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Multi Array, Conformable Ultrasound Patch for Soft Tissue Imaging
Medical ultrasound imaging is a rapidly growing field due to its safety and affordability when compared to other imaging modalities such as MRI and X-Ray. Ultrasound transducers are made in various configurations from dense 2-D arrays for volumetric imaging to single element needle like transducers …
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Design and implementation of MEMS biomechanical sensors for real-life measurements of gait parameters
… techniques (capacitive, electric field and ultrasound) that may be suitable for MEMS realization of foot clearance measurement. The study suggests that ultrasoundbased technique is very suitable for this application and thus a model is proposed in this research. The ultrasonic transducer …
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Optimizing Transcranial Focused Ultrasound: Calibration, Neuro Navigation, and BOLD fMRI Evidence of Neuromodulation
… initial implementation of transcranial focused ultrasound (tFUS) for neuromodulation in a human study. The primary objectives were to design a system capable of delivering precise and safe ultrasound stimulation to targeted brain regions and to conduct preliminary trials to assess its effects on …
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An ultrasonic sensing and indentation apparatus for assessment of tissue geometry and mechanical properties
… involves gathering and processing data from an ultrasound transducer, a force sensor, and an accelerometer. The procedure of use involves rotating the apparatus around the limb while maintaining a light contact to acquire skin-to-bone depth, and indenting the apparatus into the limb to acquire …
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Effects of high intensity focused ultrasound on the intervertebral disc
… study and try to optimise high intensity focused ultrasound treatment of the intervertebral disc. We demonstrated that it was possible to heat intervertebral discs with HIFU delivered by 50 or 5 mm diameter ultrasound transducers. Finite element studies indicated that it would be possible to heat …
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May the force be with you : a medical ultrasound system with integrated force measurement
Ultrasound is a commonly used medical imaging modality for non-invasive examination of soft tissue. Clinical ultrasound scanning requires significant contact of the transducer face with the patient, and the contact force exerted by the sonographer can vary widely throughout a scan or from scan to …
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Development of hybrid force-position controller for ultrasound-guided breast biopsy robotic system
Conventional ultrasound-guided breast biopsy (UGBB) procedure is commonly performed to assess abnormal masses within the breast. It requires a radiologist to handle multiple devices at once, which could reduce the abilities in performing such procedure resulting in radiologist’s fatigue, …
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Piezoelectric single crystal based one-dimensional phased array for breast tissue imaging
Ultrasound is widely used in clinical practice because it is safe, non-invasive, non-ionizing, low-cost, and provides real-time imaging, monitoring, and therapy. However, conventional ultrasound probes are rigid, pressure-required, and operator-dependent. Replacing rigid transducers with …
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The Physical Implications of Diastasis Recti Abdominis Among Women at the End of Their First Postpartum Year
… we investigated whether the angle at which an ultrasound transducer is held influences measurements of inter-rectus distance (IRD). Transducer angle did not appear to impact IRD measured in parous women. The latter two studies investigated the impact of DRA on trunk symptoms and function. In …
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Radiomic Analysis of Sonograms for the Detection of Tendon Damage
… medical images, such as those captured using ultrasound (US), for clinical decision-making. US images are the standard for confirming clinical tendinopathy diagnoses, as they are more accurate, less time-consuming, and less expensive than other modalities. Texture analysis, a subset of …
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