*Different receive inserts do not change coupling of TEM coil (< 6%)
*Although absorbed power and mean B1+ in the head increased in the presence of receiver inserts. Mean B1+ per Watt absorption did not change (< 3%)
*For same Input_ power, SAR increased with corresponding decrease in radiated_power from TEM coil
Tissue specific analysis of SAR indicates:
*A Global increase in absorption (9-18%)
*Vulnerable structures like eyes and tissue adjoining sinuses showed notable increase in absorption. Eyes have poor heat dissipation in comparison to the actively perfused brain.
*Peak SAR (hot-spot) location and intensity in some tissues changed when different receiver inserts were used. The close conforming helmet array affected the peak SAR distribution more than the cylindrical arrays
*Effect of copper trace width on RF absorption is subtle (< 5%) and geometry dependent, as absorption increased for the 16-loop geometry while it decreased for the 8-loop geometry.

B1+ and Coupling Variability of Transmit Head Coils and Arrays: UHFMRI Experiments and Simulations, ISMRM Melbourne May 6, 2012

• S-Parameters and tuning of the TEM coil did not change appreciably in the presence the 1/16” Rx-only array. The detuned Rx-only array did not degrade the B1+ signal. The local SAR increased by 2-30% in the presence of the Rx-only array and new hot-spots appeared.

Prior work has shown signal-to-noise ratio (SNR) increases with increasing number of receive-only channels or coil elements. Many groups have built and tested 16, 32 and 96 receive-only channels for 3 Tesla systems. None of these studies have evaluated the effects of the receive-only array on specific absorption rate (SAR) or magnetic field distribution (B1+ ). FDA/IEC regulates the SAR to 8W/Kg/10gm as the safe limit for imaging modalities using MR.

Results from full wave finite-difference time domain (FDTD) electromagnetic simulation studies conducted at 7Tesla (300 MHz), using two anatomically detailed head models (23 and 19 tissue types) and a 32 channel receive-only array indicate increased SAR in both heads with the appearance of new hot-spots. The receive-only array also modified the peak and average B1+ field, which affects the contrast and SNR of images produced by the MR system

2D Hyperthermia system using 4 sources, the source excitation is optimized to localize RF energy in tumor cells

3D MRImaging of a head model using a 9.4 Tesla external system

UNIX network programming of wireless ARM based Sharp PDA’s. I had tested the implementation of the  (α,t) clustering algorithm, on wireless PDA 's; and  wrote a simple client-server application in Linux (sockets)  that utilized the underlying adhoc-routing infrastructure,  to  transmit messages between the  PDA's.