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Ultra wideband (UWB) positioning systems are increasingly used in indoor environments since commercial systems can provide 3-D accuracy of a few centimeters. Many applications exist in medicine for UWB positioning which includes tracking personnel, assets, and surgical navigation. We have designed a UWB positioning system with millimeter accuracy. Certain applications, including surgical navigation,...
In this paper, two bandwidth allocation schemes for the transmission of medical data in the IEEE 802.11n based WLAN are proposed. These two schemes are based on the same idea: offline medical data are transmitted on the subcarriers for online traffic when these subcarriers are available; otherwise, these data are stored in patient devices. This is a tradeoff between the traffic load in the WLAN and...
This paper reports a low-power sensor signal processing and load shift keying (LSK) telemetry scheme for an inductively powered implant system. The entire system manifests a voltage reference (VR), a potentiostat, and a current controlled oscillator (CCO). All of the functional blocks are designed using subthreshold MOSFETs to achieve ultra-low-power consumption. Relatively simpler architecture of...
Medical Doppler radar research has largely been limited to obtaining respiratory and heart rates. While this information is vital for many applications, medical Doppler radar signatures carry significant other information that could lead to cardiopulmonary volume assessments, including cardiac stroke volume (SV), and cardiac output (CO). Accurate recovery of heart signal amplitude is required for...
Ultra wideband (UWB) wireless systems have many advantages in indoor environments with dense multipath. UWB positioning systems are increasingly used in indoor environments to track and locate important assets. Many applications exist in medicine for UWB positioning which includes tracking personnel, assets, and even surgical navigation. We have designed a UWB positioning system with millimeter range...
This paper outlines the intelligence and portability requirements for future genetic analysis systems tailored to fast, low cost, and large scale population studies. Methods used in current research for DNA amplification and detection are discussed. The most significant shortcomings of current practises are their lack of the programmability required to generate different heating profiles to detect...
Wearable antennas (WAs) are critical to communication among in, on, or off-body devices, and have been designed for a variety of frequency and radiation requirements. However, various factors, such as position and orientation of body, etc., can affect the antenna performance drastically, and consequently cause undesirable radiation behavior. This paper aims at offering a practical solution to the...
This paper presents the development of a radio channel model for the feasibility study of 60 GHz high-speed radio systems for a medical operation in a hospital environment. Our particular usage scenario is an angiography room, where the 60 GHz radio system sends video data from an x-ray machine to a movable screen. Our channel model is based on an extensive radio channel measurement in an angiography...
In radar based confocal microwave imaging for breast cancer detection, recorded data are synthetically focused to a confocal point within the breast. This is the basis for both data-independent and data adaptive methods to form the breast image and can be enhanced by multistatic approach. This approach inherently assumes that the propagation velocity depends only on the average dielectric property...
As the power is at a premium in a wireless powered microvalve, it necessitated the design and development of a contactless powering system specific to implant functionality. We present a custom design and development of the biotelemetry system for the implanted microvalve, using FEM modelling and experimental validation in the presence of numerical and physical human body phantoms, respectively. A...
A microwave imaging system prototype has been developed for early breast cancer detection. The system is based on impulse Ultra-Wideband (UWB) radar technology. A novel, practical calibration method has been applied in our system to remove the large received signals due to both skin backscattering and Tx/Rx antenna coupling, and to underline the reflection/scattering from object of interest. This...
A body-worn passive planar harmonic tag for sensing and uniquely isolating human respiratory motion using a Doppler radar has been designed, fabricated and tested. Agilent's advanced design system 2006 provided a simulation and performance evaluation platform. This design flow is applicable for any tag design and not just dipoles which has been the design of choice for others in the past. The tag...
Gait analysis through on-body wireless accelerometers can provide valuable information for multiple health-related applications. The dynamic nature of human body acceleration signals makes their analysis with the wavelet transform optimum. Nevertheless, one of the main issues for the practical development of this signal processing tool in real time is the difficulty in the selection of the appropriate...
This publication deals with the determination of the microwave dielectric signatures of tumorous B-lymphoma cells (NHL) up to 40 GHz. It is demonstrated that in-liquid microwave detection permits to warrant cells' living without deterioration of the analysis capabilities. The key role of the microwave absorption parameter for cells detection is moreover pointed out. The richness of the microwave signature...
Gait analysis using wireless accelerometers deployed as body area networks can provide valuable information for multiple health-related applications. Within this field, stride length estimation represents a difficult task. In this paper we present a novel method to estimate stride length through the application of the wavelet transform to the signal obtained from a wireless accelerometer on the waist...
In this paper, we evaluate the factors affecting the accuracy achievable in localization of an endoscopic wireless capsule as it passes through the digestive system of the human body. Using a three-dimension full electromagnetic wave simulation model, we obtain bounds on the capsule-location estimation errors when the capsule is in each of three individual organs: stomach, small intestine and large...
This paper presents a novel concept data collecting device for body-centric wireless communications, smart robe or blanket. It couples to sensor units on human body wirelessly by just putting on the human body. It is consisting of textile-based free access mat. The free access mat is a thin sheet-shaped waveguide which wireless devices can couple to at an arbitrary position on it. We investigate the...
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