check_grad_continuity

pypulseqpp.safety.check_grad_continuity()

Check gradient amplitude continuity across block boundaries.

Parameters:

• seq (Sequence) – The sequence to check.

• system (pypulseqpp.Opts, default=None) – System limits supplying the slew limit a discontinuity is compared with; the sequence’s own by default.

Returns:

• is_ok (bool) – True when no discontinuity is found and every gradient waveform ends at zero amplitude.

• report (SimpleNamespace) – limit; the discontinuities found, each naming the block, the axis, the amplitudes before and after the boundary and the slew rate the step implies; and ends_at_zero.

Notes

Endpoints are compared after each block’s rotation. An absent gradient contributes zero amplitude. A discontinuity is evaluated over one gradient raster period, and the final amplitude on every axis must be zero. Block indices are 1-based, axes are zero-based integers, amplitudes are in Hz/m and slew rates in Hz/m/s.