MOLLISimulator

class torchsim.simulators.MOLLISimulator(*args, **kwargs)

Bases: Simulator

Look-Locker readout blocks separated by free recovery, after one inversion.

Modified Look-Locker inversion recovery [1] reads the recovery in blocks, one per heartbeat. The first block starts from the inversion; between blocks the pulses stop, and the longitudinal magnetization the last readout of a block recorded recovers towards M0 for recovery milliseconds before the next block starts from it.

References

[1]

Messroghli, D. R., Radjenovic, A., Kozerke, S., et al., “Modified Look-Locker inversion recovery (MOLLI) for high-resolution T1 mapping of the heart”, Magnetic Resonance in Medicine 52.1 (2004), pp. 141-146. https://doi.org/10.1002/mrm.20110

Examples

from torchsim.simulators import MOLLISimulator

sequence = MOLLISimulator(flip=35.0, TR=2.5, readouts=(40, 40, 40), recovery=800.0)
signal = sequence.simulate(T1=(800.0, 1400.0))
print(signal.shape)

torch.Size([2, 120])

Methods

bind	This simulator with more fixed on it, values or settings alike.
describe	Return the description this protocol plays.
evaluate	Evaluate the closed form, no state machine and no description.
from_description	Return a simulator over a stream someone else assembled.
from_pulseq	Return a simulator over one repetition of a Pulseq sequence.
jacobian	Return the signal and its derivative with respect to diff.
layout	Return the operators of one repetition, in the order they play.
played	Return the protocol as it will be laid out.
repetition_s	Return how long one repetition lasts, given what the layout played.
simulate	Return the recorded signal.

evaluate(properties, **sequence)

Evaluate the closed form, no state machine and no description.