Coilmaps

[johannesmayer]

Coilmaps need to be incorporated into the simulation.
Either they need to be simulated, (cf. ismrmrd shepp logan example file)
or one needs to be able to pass external coils and the header infos need to be updated accordingly.

[johannesmayer]

From ismrmrd_phantom.cpp the function boost::shared_ptr<NDArray<complex_float_t> > generate_birdcage_sensititivies only provides 2D coilmaps.
Options:

• Generate custom simulation using Biot-Savart numeric integration ( oriented at code from MRXCAT)
• Use some form of dummy simulation (maybe a 3D version of the above mentioned is available)
• use some available library to simulate -> too much coupling

[johannesmayer]

To simulate very simple artificial coils just use spherical harmonics.
This way the coil maps show some well-behaved spatial changes and are easy to implement?