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Original Research RF Transmit Power Limit for the Barewire Loopless

Summary: Original Research
RF Transmit Power Limit for the Barewire Loopless
Catheter Antenna
Christopher J. Yeung, BASc and Ergin Atalar, PhD*
The safety of the barewire loopless catheter antenna in
transmit mode is addressed with respect to radiofrequency
(RF) heating. Analytical expressions for electric field and
specific absorption rate (SAR) distributions surrounding
the antenna are postulated and experimentally verified.
Limiting RF transmit power to 4070 mW time-averaged
power, depending on the specific antenna design, will en-
sure that the current regulatory guideline of SAR of 8 W/kg
in any gram of tissue is not exceeded. These limits can act
as guidelines for the design of RF pulses for use with this
device. Further study is required to examine the safety of
the antenna in receive mode. J. Magn. Reson. Imaging
2000;12:8691. 2000 Wiley-Liss, Inc.
Index terms: safety; RF heating; interventional MR; intravas-
cular MR
Many developments have taken place in the emerging


Source: Atalar, Ergin - Department of Electrical and Electronics Engineering, Bilkent University


Collections: Engineering; Biology and Medicine