User defined waveforms

[Xin Chen]

Dear JEMRIS Developers,

I'm simulating a RF pulse and a concurrent gradient field for slice selection. Both RF and gradient waveforms are user defined, and they have different sampling rate. For example, the RF waveform has one data point per 3 microseconds, while the gradient waveform has one data point per 5 microseconds. My questions are:

1. How does JEMRIS handle these two waveforms in the computation?

2. Would the different sampling rate of RF and gradient waveforms have any impact on the simulation? Do I need to define both waveforms with the same sampling rate?

Thanks much for your time!

Xin

[tony.s...@gmail.com]

Hi Xin,

the numerical integrator is forced to calculate the solution at each time point of the user-defined external waveform. This might be much slower compared to an analytical definition of the waveforms. Apart from the calculation time, the different samplings of your external RF and gradient waveforms should be no problem.  
Hope this helps,

Tony