longitudinal_relaxation_exchange_op#
- torchsim.epg.longitudinal_relaxation_exchange_op(weight, k, R1, time)[source]#
Prepare longitudinal relaxation and recovery operators in presence of exchange.
- Parameters:
weight (torch.Tensor) – Fractional weight for the different pools of shape
(npools,).k (torch.Tensor) – Directional exchange rate matrix in
[1/s]of shape(npools, npools).R1 (torch.Tensor) – Longitudinal relaxation rate in
[1/s]of shape(npools,).time (torch.Tensor) – Time interval in
[s].
- Returns:
E1 (torch.Tensor) – Longitudinal relaxation and exchange operator.
rE1 (torch.Tensor) – Longitudinal recovery and exchange operator.
- Return type:
tuple[Tensor, Tensor]