Electromagnetic Near Fields of Rectangular Waveguide Antennas in Contact with Biological Objects Obtained by the FD-TD Method
スポンサーリンク
概要
- 論文の詳細を見る
Multifrequency microwave radiometry for non-invasive measurement of temperature in biological objects has been investigated in our laboratory. An open-ended rectangular waveguide filled with a dielectric has been used as a contact-type antenna of a radiometer operating over a 1-4 GHz range. In the radiometric measurement, the radiometer measures the thermal radiation emitted by the object via the antenna as the brightness temperature. The brightness temperature is related to the physical temperatures in the object through the radiometric weighting function. By virtue of the reciprocity of antenna, the weighting function can be derived from the field distribution induced in the object by the same antenna when it is operated in the active mode. In this paper, the FD-TD method is used to analyze the problem of coupling between the rectangular waveguide antenna and a biological object. The objects studied in this paper are a homogeneous and a four-layered lossy media. Working frequency is 1.2 GHz, which is the center frequency of the lowest-frequency band of our radiometer. Numerical results are presented in the form of SAR patterns. It is found that the SAR patterns tend to spread out in the lateral directions in the bolus, skin and fat layers due to the diffraction which becomes stronger at lower frequencies. Results also suggest that the lateral spreading can be controlled to a certain extent by choosing the size of antenna flange properly.
- 社団法人電子情報通信学会の論文
- 1995-06-25
著者
-
Abe K
Research Institute Of Electronics Shizuoka University
-
Sugiura Toshifumi
Research Institute of Electronics, Shizuoka University
-
Abe Katsumi
Research Institute of Electronics, Shizuoka University
-
Mizoshiri Shinya
Research Institute of Electronics, Shizuoka University
-
Mizushina Shizuo
Research Institute of Electronics, Shizuoka University
-
Mizushina S
Research Institute Of Electronics Shizuoka University
-
Mizushina Shizuo
Research Institute Of Electronics Shizuoka University
-
Sugiura T
Research Institute Of Electronics Shizuoka University
-
Sugiura T
Shizuoka Univ. Shizuoka‐shi Jpn
-
Sugiura Toshifumi
Research Institute Of Electronics Shizuoka University
-
Sugiura T
Shizuoka University
関連論文
- Effects of Vegetable Containing Gamma-Aminobutyric Acid on the Cardiac Autonomic Nervous System in Healthy Young People
- PD3-7 Acute Phase Effect on Cardiovascular and Autonomic Nervous Systems by Vegetable Juice Intake(Proceedings of The 8th International Congress of Physiological Anthropology)
- 1-10 Changes of EEG and Heart Rate Variability after Vegetable Juice Intake
- Introduction of a Method for Computing Electrostatic Potential Distribution around a DNA Molecule by a Cylinder Model (特集 生体信号の計測と処理)
- 1-204 Computation for Potentials Produced by Interacting Channel Polypeptide on the Excitable Membrane
- 1-202 Evaluation of Replication Process of DNA Unwinding by H-infinite Control
- Electromagnetic Near Fields of Rectangular Waveguide Antennas in Contact with Biological Objects Obtained by the FD-TD Method
- Computation of the Field Distribution Generated by a Rectangular Aperture in a Four-Layered Lossy Dielectric Medium by Modal Analysis
- Recent Trends in Medical Microwave Radiometry
- LPE Growth of Uniform (Ga, Al)P Alloy Crystal
- P2-6 Time-Frequency Analysis of Bowel Sound before and after Meals(Proceedings of the 50th Meeting of Japan Society of Physiological Anthropology)
- Cardiac Pacing System Based on Fuzzy Logic
- P1-1 Reaction Time and Event-Related Potentials in a Memory Scan Task Concerning with Movement Directions(Proceedings of the 50th Meeting of Japan Society of Physiological Anthropology)
- A fuzzy logic-based adaptive arrhythmia detection algorithm for use in cardioverter defibrillators
- P1-4 Influence of Acoustic Stimulations during a Memory Scan test of RDP Moving Directions(Proceedings of the 50th Meeting of Japan Society of Physiological Anthropology)
- 1-12 Comparison between Spectral Analysis and Lorenz Plot for Evaluation of Autonomic Nervous Activity
- P2-7 Pulse Wave Velocity and Heart Rate Variability during Mental Arithmetic and Cold Water Loads(Proceedings of the 50th Meeting of Japan Society of Physiological Anthropology)
- Multifrequency Microwave Radiometry for Non-Invasive Thermometry Using a New Temperature Profile Model Function
- Accurate Determinatuon of Microwave Conductivity by Means of Cavity Coupling Coefficient Measurement
- A Pulling Ellipse Method for Measurements of Microwave Oscillator in Operation
- PB3-4 EEG and Cardiovascular Responses to Acupressure on Acupoints of Planta Pedis(Proceedings of The 8th International Congress of Physiological Anthropology)
- Heart Rate and Electroencephalogram Changes Caused by Finger Acupressure on Planta Pedis
- Band Power and Coherence Changes of EEG during Mental Arithmetic Tasks (Proceedings of the 54th Meeting of Japan Society of Physiological Anthropology)
- Barrier Potential across Semiconductor P-N Junction and Resting Membrane Potential