Inductively Coupled Birdcage Coil
, D. M. Gulnerman1
, B. Akin2
, and E. Atalar1,2
Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, 2
National Magnetic Resonance Research Center (UMRAM), Ankara, Turkey
In MRI, internal coils, which are designed for diagnostic and interventional procedures, increase the signal-to-noise ratio of the images significantly when compared to
conventional imaging coils. This is because, these coils can be placed near a region of interest (1,2). They, however, are connected to scanner hardware by cables, which
bring safety and handling problems. In addition, each of these coils is imager and site dependent because of special hardware and software requirements.
Although birdcage coils are essential elements of modern MRI scanners, they have never been miniaturized for placement inside body orifices such as the rectum and
used as inductively coupled coil elements. In this study, inductively coupled birdcage coil (ICBC) and receive coupled birdcage coil (RCBC) (3) are introduced as
internal coil. These coils can be used without modifying the scanner hardware and do not affect tuning of external coils. ICBC coils are not connected to the scanner by
wires; rather the MR signal picked up by these coils is transferred to a receiving coil by induction. Therefore, they are system independent.
Quadrature birdcage volume coils are designed such that they
create uniform forward polarized magnetic field inside the coil. If