Calibrated electro-optic E-field sensors for hyperthermia applications.

Abstract

E-field measurements are an important task for the investigation of newly developed hyperthermia applicators as well as for online control of hyperthermia treatments. Compact and non-perturbing integrated optical E-field sensors based on LiNbO3 as well as optical E-field sensors based on infrared emitting diodes and light bulbs are suitable for nearfield measurements of hyperthermia antennas. In order to investigate their properties a calibration cell with transverse electromagnetic (TEM) waves has been constructed. By using this cell, calibration curves and directional patterns for all sensors have been measured. Due to the threshold behaviour of the IRED and light bulb sensor, only the LiNbO3 sensor is capable of measuring weak fields inside an applicator or a homogeneous phantom.

• Authors: J Berger, K Petermann, H Fähling, P Wust
• Journal: Physics in medicine and biology (Phys Med Biol) Vol. 46 Issue 2 Pg. 399-411 (Feb 2001) ISSN: 0031-9155 [Print] England
• PMID: 11229722 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Oxides
• Niobium
• lithium niobate

Topics

• Biophysical Phenomena
• Biophysics
• Electronics, Medical (instrumentation)
• Humans
• Hyperthermia, Induced (instrumentation, statistics & numerical data)
• Niobium
• Optics and Photonics (instrumentation)
• Oxides
• Phantoms, Imaging
• Radiofrequency Therapy
• Sensitivity and Specificity