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deepmr.bloch.t1t2shuffling

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deepmr.bloch.t1t2shuffling#

deepmr.bloch.t1t2shuffling(flip, phases, ESP, TR, T1, T2, sliceprof=False, diff=None, device='cpu', **kwargs)[source]#

Simulate a T1T2Shuffling Spin Echo sequence. Only single-pool for now.

Parameters:

  • flip (float | np.ndarray | torch.Tensor) – Flip angle in [deg] of shape (npulses,) or (npulses, nmodes).

  • phases (float | np.ndarray | torch.Tensor) – Refocusing angle phases in [deg] of shape (npulses,) or (npulses, nmodes).

  • ESP (float) – Echo spacing in [ms].

  • TR (float) – Repetition time in [ms].

  • T1 (float | np.ndarray | torch.Tensor) – Longitudinal relaxation time for main pool in [ms].

  • T2 (float | np.ndarray | torch.Tensor) – Transverse relaxation time for main pool in [ms].

  • sliceprof (float | np.ndarray | torch.Tensor) – Excitation slice profile (i.e., flip angle scaling across slice). If False, pulse are non selective. If True, pulses are selective but ideal profile is assumed. If array, flip angle scaling along slice is simulated. Defaults to False.

  • spoil_inc (float, optional) – RF spoiling increment in [deg]. Defaults to 117°.

  • diff (str | tuple[str], optional) – String or tuple of strings, saying which arguments to get the signal derivative with respect to. Defaults to None (no differentation).

  • device (str) – Computational device (e.g., cpu or cuda:n, with n=0,1,2...). Defaults to cpu.

  • nstates (int, optional) – Maximum number of EPG states to be retained during simulation. High numbers improve accuracy but decrease performance. Defaults to 10.

  • max_chunk_size (int, optional) – Maximum number of atoms to be simulated in parallel. High numbers increase speed and memory footprint. Defaults to natoms.

  • verbose (bool, optional) – If True, prints execution time for signal (and gradient) calculations. Defaults to False.

  • B1 (float | np.ndarray | torch.Tensor , optional) – Flip angle scaling factor (1.0 := nominal flip angle). Defaults to None.

  • B0 (float | np.ndarray | torch.Tensor , optional) – Bulk off-resonance in [Hz]. Defaults to None

  • B1Tx2 (float | np.ndarray | torch.Tensor) – Flip angle scaling factor for secondary RF mode (1.0 := nominal flip angle). Defaults to None.

  • B1phase (float | np.ndarray | torch.Tensor) – B1 relative phase in [deg]. (0.0 := nominal rf phase). Defaults to None.

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