Enhanced absorption of millimeter wave energy in murine subcutaneous blood vessels

The aim of the present study was to determine millimeter wave (MMW) absorption by blood vessels traversing the subcutaneous fat layer of murine skin. Most calculations were performed using the finite‐difference time‐domain (FDTD) technique. We used two types of models: (1) a rectangular block of mul...

Full description

Saved in:
Bibliographic Details
Published in:Bioelectromagnetics 2011-09, Vol.32 (6), p.423-433
Main Authors: Alekseev, Stanislav I., Ziskin, Marvin C.
Format: Article
Language:English
Subjects:
Absorption
Animals
Blood Vessels - radiation effects
Computer Simulation
FDTD technique
In Vitro Techniques
Mice
murine skin
Radio Waves - therapeutic use
Skin - radiation effects
specific absorption rate
Subcutaneous Fat - blood supply
Subcutaneous Fat - radiation effects
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The aim of the present study was to determine millimeter wave (MMW) absorption by blood vessels traversing the subcutaneous fat layer of murine skin. Most calculations were performed using the finite‐difference time‐domain (FDTD) technique. We used two types of models: (1) a rectangular block of multilayer tissue with blood vessels traversing the fat layer and (2) cylindrical models with circular and elliptical cross‐sections simulating the real geometry of murine limbs. We found that the specific absorption rate (SAR) in blood vessels normally traversing the fat layer achieved its maximal value at the parallel orientation of the E‐field to the vessel axis. At 42 GHz exposure, the maximal SAR in small blood vessels could be more than 30 times greater than that in the skin. The SAR increased with decreasing the blood vessel diameter and increasing the fat thickness. The SAR decreased with increasing the exposure frequency. When the cylindrical or elliptical models of murine limbs were exposed to plane MMW, the greatest absorption of MMW energy occurred in blood vessels located on the lateral areas of the limb model. At these areas the maximal SAR values were comparable with or were greater than the maximal SAR on the front surface of the skin. Enhanced absorption of MMW energy by blood vessels traversing the fat layer may play a primary role in initiating MMW effects on blood cells and vasodilatation of cutaneous blood vessels. Bioelectromagnetics 32:423–433, 2011. © 2011 Wiley‐Liss, Inc.
ISSN:0197-8462
1521-186X
DOI:10.1002/bem.20658