Session Detail

In recent years, many studies have pointed out that abnormal blood flow patterns can be regarded as pathological signs and essential indicators for diagnos-ing cardiovascular diseases. Hence, the purpose of this study is aimed to develop a real-time, non-invasive measurement for blood flow in vivo. The imaging sys-tem is expected to provide the information using vector Doppler imaging technique. By the dynamic analysis on the speed and direction of blood flow, the system would be able to provide much more valuable information on preclinical research.

 

Focused ultrasound phased array systems have attracted increased attention for brain therapy applications. However, such systems currently lack a direct and real-time method to intraoperatively monitor ultrasound pressure distribution for securing treatment. This study proposes a dual-mode 256-channel ultrasound phased array system design to support transmit/receive operations for concurrent ultrasound expo-sure and backscattered focal-beam reconstruction through a spherically focused ultrasound array. A total 256-channel ultrasound transmission system was used to transmit focused ultrasonic energy, with an extended implementation of multi-ple-channel receiving function (up to 64 channels) using the same 256-channel ultrasound array. Our results showed that PSF and focal beam can be successfully reconstructed and visualized in free-field conditions, and can also be transcrani-ally reconstructed following skull-induced aberration correc-tion. In-vivo experiments were conducted to demonstrate its capability to pre-operatively and semi-quantitatively map a focal beam to guide blood-brain barrier (BBB)-opening. The proposed system may have potential for real-time guidance of ultrasound brain intervention, and may facilitate the design of a dual-mode ultrasound phased array for brain therapeutic applications.

 

A low-voltage CMOS analog front-end suitable for portable bio-signal monitoring devices such as the electrocardiogram (ECG) and the electroencephalogram (EEG) is described. The circuit is design based on the second generation current conveyor where the circuit is composed of two second generation current conveyors (CCIIs), two electronically and linearly OTA (EOTAs) and two capacitors. The voltage gain can adjustable for 40 dB to 58dB by the external DC bias current. It works at zero input common mode voltage with ±0.5V supply voltage with the power consumption is about 0.42mW in typical situation and the CMRR is found to be 223dB at the voltage gain of 800V/V (58dB). The integrated input referred noise is 0.11µVrms/sqrt(Hz) (0.1-200Hz). The characteristics and performances of this circuit are confirmed through PSPICE simulation results.

 

Purpose: "Sitting" is a kind of exercise that relaxes in the lower part of body, but the upper part of body does not. Sedentariness can cause hunchback and scoliosis. As the children are still in a growing period, the impact is greater. Method: We choose 5 sitting posture that are: keep the back straight, slouch, severe slouch, cross left leg over right and cross right leg over left. Using 5 pairs of pressure sensor symmetrically distributed on a round cushion. Determine the current sitting posture of the user through the position of the center of gravity. If user's sitting posture is not correct, an app will vibrate as reminder. Result: Different sitting postures have different position of the center of gravity. Through the characteristics, we can determine what the posture the user is. The accuracy rate of this system, for children is 96.11% and for the adults is 95.56%. Conclusion: According to the test results, children and adults can use the system. This system accurately reflects the posture of the users and can make the mobile devices vibrate to remind via the Bluetooth.

 

Falling is one of the major reasons that leads to a wounded problem, not only is it studied by different medical institutions, but it has also caught the attention of the scientific community. It is a common phenomenon for frail people, especially for elderly people. Since this is one of the top reasons why most elderly people get into an accident. To avoid and reduce the accident caused by fall, the objective of our study is to develop a wearable sensor and to collect data gathered from the inertial measurement unit (IMU) sensor with 9-axis. In this study, the system including posture detection and feature analysis was presented. In which it monitors and generates patterns during various exercises namely: walking, jumping, sitting-standing routine and falling. By doing so, the movements of the said frail people could be tracked and detected to reduce their chances of getting into an accident.

 

Brushing teeth is a daily hygiene practice. Currently, the commercial selling toothbrush unit only has a general physical cleaning function. It also needs to collaborate with toothpaste that may potentially harm to the human body for cleaning though the cleansing effect is limited. Therefore, this study presents the application of plasma technology in the toothbrush. This use the chemical properties of plasma on sterilization which can cover interdental and physical bristles of the toothbrush, so as to achieve perfect cleansing and removing oral residual. The plasma-cleaning toothbrush not only can inhibit the bacterial growth that may cause oral disease, it also can be thought as self-cleaning when not in use. The internal and external structure of the toothbrush was designed and use the homemade power supply to determine the best plasma excitation state. The electrical properties, temperature, reactive species and sterilization effect of the plasma toothbrush were tested and analyzed. The planar reactor was placed inside the brush head and then the internal motor fan blows the reactive oxygen species generated by the plasma to the oral cavity to achieve sterilization effects. The total power consumed by the system is 13.829W by supplying voltage and frequency, 7.68kV and 7.143kHz respectively. The experimental results showed that the maximum excitation temperature during the process is 40 °C and will not cause any thermal damage to human tissues. The sterilization of E. coli can reach 90% D-Value at 115 seconds, which can achieve complete sterilization in four minutes.