TY - GEN
T1 - Development of a hybrid microwave-optical deep muscle warming monitor
AU - Al-Armaghany, Allann
AU - Tong, Kin Fai
AU - Leung, Terence S.
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2015/2/5
Y1 - 2015/2/5
N2 - Elevating the temperature in tissue leads to vasodilation and therefore an increase in blood flow to reduce the excessive heat in the region, a physiological mechanism known as thermoregulation. These thermal responses have been used in various clinical applications to monitor the conditions of the spinal cord injury, vascular responses and free flap reconstruction. Currently blood flow measurements such as laser doppler flowmetry (LDF) are restricted to the skin, a rather superficial layer. To allow the investigation into deeper tissue such as the muscle, a new hybrid microwave-optical system has been developed. The deep warming is provided by a novel microwave applicator, which has a microstrip patch design operating at 2.45 GHz with a superstrate interface layer to improve the coupling of electromagnetic (EM) waves into the skin. Its design is based on computer simulations of specific absorption rate (SAR) and thermal distribution of the EM waves in a biological medium. The simulation results show that the applicator is capable of elevating the muscle temperature by 3-4 °C. The thermal response is measured by an integrated optical probe which measures tissue oxygenation changes in deep tissue using the near infrared spectroscopy technique. The hybrid microwave-optical system has been built and tested on human calves in vivo. In the talk, we will present the development of this new type of non-invasive microwave applicator for deep tissue warming.
AB - Elevating the temperature in tissue leads to vasodilation and therefore an increase in blood flow to reduce the excessive heat in the region, a physiological mechanism known as thermoregulation. These thermal responses have been used in various clinical applications to monitor the conditions of the spinal cord injury, vascular responses and free flap reconstruction. Currently blood flow measurements such as laser doppler flowmetry (LDF) are restricted to the skin, a rather superficial layer. To allow the investigation into deeper tissue such as the muscle, a new hybrid microwave-optical system has been developed. The deep warming is provided by a novel microwave applicator, which has a microstrip patch design operating at 2.45 GHz with a superstrate interface layer to improve the coupling of electromagnetic (EM) waves into the skin. Its design is based on computer simulations of specific absorption rate (SAR) and thermal distribution of the EM waves in a biological medium. The simulation results show that the applicator is capable of elevating the muscle temperature by 3-4 °C. The thermal response is measured by an integrated optical probe which measures tissue oxygenation changes in deep tissue using the near infrared spectroscopy technique. The hybrid microwave-optical system has been built and tested on human calves in vivo. In the talk, we will present the development of this new type of non-invasive microwave applicator for deep tissue warming.
KW - Integrated Patch Antennas
KW - SAR
KW - superstrate hyperthermia
KW - thermal distribution
UR - https://www.scopus.com/pages/publications/84925710942
U2 - 10.1109/IMWS-BIO.2014.7032439
DO - 10.1109/IMWS-BIO.2014.7032439
M3 - Conference contribution
AN - SCOPUS:84925710942
T3 - Conference Proceedings - 2014 IEEE MTT-S International Microwave Workshop Series on: RF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-Bio 2014
BT - Conference Proceedings - 2014 IEEE MTT-S International Microwave Workshop Series on
T2 - 2014 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-Bio 2014
Y2 - 8 December 2014 through 10 December 2014
ER -