InversionRecoverySimulator

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

Bases: Simulator

Longitudinal recovery from an inversion, read at a series of delays.

A spin echo long enough after the inversion samples the longitudinal magnetization alone, so the contrast is the recovery curve itself. The repetition time bounds how much the magnetization has recovered by the time the next inversion arrives; leave it out for a fully relaxed one.

offset is a constant added to the recovery, which is what a magnitude reconstruction’s noise floor looks like to a fit and what stops the fitted T1 absorbing it.

Examples

from torchsim.simulators import InversionRecoverySimulator

sequence = InversionRecoverySimulator(TI=(50.0, 400.0, 1100.0, 2500.0))
signal = sequence.simulate(T1=(800.0, 1400.0))
print(signal.shape)

torch.Size([2, 4])

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.