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 34 for “"Non ionizing"”.
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Imaging and spectroscopy of tissue-like phantoms using photon density waves: Theory and experiments
… of biological tissue would allow for the non-invasive and non-ionizing imaging of tissue structure and the monitoring of physiology. Until recently, such characterization of thick, highly scattering biological tissues using visible and near infrared light has been thwarted because of the …
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Power evaluation and performance enhancement of CSMA/CA based WLANs.
… lower than the International Commission on Non-Ionizing Radiation Protection (ICNIRP) limit; (2) We propose two decentralized Multiple Access Control (MAC) schemes that converge to collision-free schedules almost surely and therefore improve throughput performance. In adopting decentralized …
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Optimized pulsing of high-intensity focused ultrasound for enhanced therapeutic window
… (HIFU) provides a unique modality to perform non-invasive surgeries. The thermal ablation technique relies on focusing the non-ionizing acoustic wave within soft tissues to produce a small lesion. HIFU operations are typically attempted by continuous-wave (CW) applications of the beam …
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Nuclear magnetic resonance sensors and methods for chemical sensing in tissue
… Nuclear magnetic resonance (NMR) offers a non-ionizing, rapid, repeatable, and molecularly sensitive measurement technique for chemical sensing. Existing hardware for highly versatile single sided measurement systems is insufficient for clinical use due to constraints on the size and shape …
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Efficient CNNs and Energy Efficient SRAM Design for ubiquitous medical devices
… to estimate bladder volume as it is portable, non-ionizing, and low-cost. Despite this, ultrasound technology faces fundamental challenges limiting its usability for next generation wearable technologies. (1) Current systems require skilled manual scanning with attendant measurement …
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CHARACTERIZATION OF CRYSTALLINE PIGMENTS WITH LOW-FREQUENCY VIBRATIONAL SPECTROSCOPY AND SOLID-STATE DENSITY FUNCTIONAL THEORY
… forgeries. Ideal characterization methods are nondestructive, noninvasive, and able to distinguish between pure and mixed pigment samples. Spectroscopic techniques are commonly used to identify pigment composition because of their non-ionizing nature, rapid acquisition times, and safety. …
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Enhanced physics modelling and multistatic data integration for breast tissue reconstruction in microwave radar imaging
… breast imaging offers a low-cost, portable, and non-ionizing alternative for breast cancer detection by exploiting the contrast in dielectric properties between malignant and healthy tissues. Its simplicity and safety make it particularly attractive for screening in under-served or remote …
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Design and Development of Single Element Focused Ultrasound Transducers
Histotripsy is a non-invasive, non-thermal, and non-ionizing therapy that utilizes converging high-pressure ultrasound waves at a focal point to produce cavitation and induce mechanical tissue destruction. Currently, rapid prototyped histotripsy transducers consist of multiple elements and are made …
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Initial experience of intraoperative identification of parathyroid glands with elastic scattering spectroscopy
… data was collected using a portable, handheld, noninvasive, "cold" fiber optic probe able to detect spectra in a non-ionizing, broadband spectrum of light (320 to 920 nm). Five measurements were collected at each tissue site over a total of 1.2 seconds. Visual analysis of tissue was analyzed and …
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Synergistic Combination of Microwaves and Acoustic Signals: Towards Improved Breast Imaging
… scans involving no breast compression, non-ionizing radiation, inexpensive scan costs, sensitivity to water content and low-complexity 3D image reconstruction. These benefits are well-suited for its application in breast health monitoring and treatment surveillance for which there is no …
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Design a high gain UWB mimo uniplanar monopole antenna with FSS array for metallic object microwave imaging
… (MWI) applications due to its broad bandwidth, non-ionizing radiation, and cost-efficiency. this study involves the design and development phases for the optimum solution of UMB antenna's issues. In the design phase, a compact uniplanar hexagon UMB monopole antenna with a coplanar waveguide …
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NEAR INFRARED SPECTROSCOPIC ASSESSMENT OF BONE WATER BINDING TO COLLAGEN AND MINERAL
… known as near infrared spectroscopy (NIRS) is a nondestructive modality that can spatially evaluate alterations of bone composition. NIRS is a unique nondestructive technique that produces a signature spectrum by penetrating high frequency (4000-12,000 cm-1) non-ionizing radiation into material. …
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Development of an ultrasound system to measure in vivo dynamic cervical spine intervertebral disc mechanics
… population to provide a low-cost, portable, and non-ionizing cervical spine imaging solution.
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Piezoelectric single crystal based one-dimensional phased array for breast tissue imaging
… 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 conformable ultrasound …
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Tethered Magnetic Serial Robots for Minimally Invasive Neurosurgery
The high-speed, non-ionizing, wireless power transfer capabilities of low-frequency magnetic fields make them an attractive option for actuating devices on the nanometer scale up to the centimeter scale, enabling a new suite of minimally-invasive techniques for a wide variety of medical procedures. …
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Real-time Temperature Imaging Using Ultrasonic Change in Backscattered Energy
… has the advantages of being cheap, portable, non-invasive and non-ionizing. Our group showed in predictions for single scatterers, simulations of scatterer populations and measurements in 1D, 2D and 3D, that CBE changed monotonically with temperature with 1<sup>o</sup>C accuracy. An obstacle …
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Dual-modality thermoacoustic and photoacoustic imaging
… dual-contrast: microwave and light absorption), non-ionizing, low-cost, high-resolution, three-dimensional breast imaging. We have also developed a novel concept of using a negative acoustic lens to increase the acceptance angle of an unfocused large-area ultrasonic transducer: detector), leading …
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Evaluating Bone by Ultrasound
… Considering its low cost, high portability, and non-ionizing nature, non-invasive ultrasound techniques have been investigated as tools for evaluating bone quality and biomechanical competence. Quantitative ultrasound has been used clinically as a surrogate for the current gold standard measure …
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Ultra-Wideband Imaging System For Medical Applications. Simulation models and Experimental Investigations for Early Breast Cancer & Bone Fracture Detection Using UWB Microwave Sensors
… soft tissues and bones. Microwave imaging uses non-ionizing ultra wideband (UWB) electromagnetic signals and utilises tissue-dependent dielectric contrast to reconstruct signals and images using radar-based or tomographic imaging techniques. Microwave imaging offers low health risk, low …
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Design and characterisation of wideband antennas for microwave imaging applications
… low cost, small in size, has high mobility, and non-ionise frequency. This research is to design an antenna for microwave imaging, namely corrugated u-slot antenna at 1.17-5.13 GHz with the reference of S11 less than -10 dB. Two corrugated u-slot antennas; namely antenna 1 and antenna 2 are …
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