A flying operator had to send and receive in Morse code and transcribe the results while changing tuning coils in the set and adjusting a long trailing antenna to suit the frequency in use; altogether a four-handed job, and one a pilot alone would have found overwhelming.
The approach uses the 1H signal from the PCM packing and the 19F signal from the flowing fluid to allow monitoring of both particle bed structure/phase and flow velocities in the same sample with the use of a dual tune coil.
Each beam is registered by one of three specifically tuned coils embedded in the mapping catheter tip to specify location in 3D space, when the catheter tip is considered against a reference catheter.
A technique for tuning the coils utilizing the spectral qualities of the noise produced by the receive coil or flowing through it is presented.
A flexible configuration of stacked thin film coils allows parallel and serial switching, thereby allowing to tune the coil's resonance frequency.
Copolymerization with hydrophilic or hydrophobic comonomers represents a suitable method to tune the coil to globule transition temperature of several homopolymers, and incorporation of other monomers provided further interesting features, such as pH responsiveness or sensing properties.
In contrast, the chemical structure of zwitterionic blocks, which all belonged to the class of poly(sulfobetaine methacrylate)s, was varied broadly, in order to tune their coil-to-globule collapse transition of the upper critical solution temperature (UCST) type.
A network analyzer was used to monitor matching and tuning of the coil.
It has been proved that by fulfilling some conditions, accurate matching is not necessary and the noise spectrum can be utilized for tuning a receive coil.
The application of localized 1H MRS is implemented by using the imaging coil tuned to proton resonances.
This results in a compact nested cross-coil pair with the inner solenoid coil tuned to the low frequency detection channel.
