[mzaiss]

Resolves issue #175 The parser was already fast. The conversion called PyGradient.integrate once per event. Moments now come from one cumulative piecewise-linear integral per gradient, which covers trapezoids, extended trapezoids, and arbitrary shapes. Results match the old importer.

exact_trajectories=True (default):

File	Old	New
pp_mprage.seq	26 s	3.6 s
pp_radial.seq	0.80 s	0.22 s
mrseq_spiral.seq	5.6 s	0.43 s
pp_tse.seq	0.41 s	0.10 s
mrseq_radial_1_5.seq	3.0 s	0.24 s
mrseq_spiral_1.5.seq	3.0 s	0.23 s

[github-actions]

Simulation test: main (before) vs. this PR (after)

Sequence	Status	max mag NRMSE	max phase RMSE	max runtime Δ
mr0_DREAM_STE_seq	✅	0.00e+00	0.00e+00	+3.9%
mr0_DWI_SE_EPI	✅	0.00e+00	0.00e+00	-0.6%
mr0_EPI_2D_seq	✅	0.00e+00	0.00e+00	+7.7%
mr0_FID_seq	✅	0.00e+00	0.00e+00	+2.1%
mr0_FLASH_2D_seq	✅	0.00e+00	0.00e+00	+5.2%
mr0_GRE_to_FLASH	⚠️	–	–	–
mr0_RARE_2D_seq	✅	0.00e+00	0.00e+00	+1.6%
mr0_SE_CPMG_seq	✅	0.00e+00	0.00e+00	+4.5%
mr0_STE_3pulses_5echoes_seq	✅	0.00e+00	0.00e+00	+4.0%
mr0_TSE_2D_multi_shot_seq	✅	0.00e+00	0.00e+00	+1.0%
mr0_bSSFP_2D_seq	✅	0.00e+00	0.00e+00	+6.1%
mr0_diffusion_prep_STEAM_2D_seq	✅	0.00e+00	0.00e+00	+5.6%

✅ mr0_DREAM_STE_seq: All tests passed.

✅ mr0_DWI_SE_EPI: All tests passed.

✅ mr0_EPI_2D_seq: All tests passed.

✅ mr0_FID_seq: All tests passed.

✅ mr0_FLASH_2D_seq: All tests passed.

⚠️ mr0_GRE_to_FLASH: No comparison possible: [Errno 2] No such file or directory: '/home/runner/work/MRzero-Core/MRzero-Core/tests/simulation_test/ref_files/mr0_GRE_to_FLASH.seq.npz'

✅ mr0_RARE_2D_seq: All tests passed.

✅ mr0_SE_CPMG_seq: All tests passed.

✅ mr0_STE_3pulses_5echoes_seq: All tests passed.

✅ mr0_TSE_2D_multi_shot_seq: All tests passed.

✅ mr0_bSSFP_2D_seq: All tests passed.

✅ mr0_diffusion_prep_STEAM_2D_seq: All tests passed.

Workflow run — raw .npz data is attached as artifacts.

[J-Endres]

The python side of the importer already was AI-generated; if the results are identical I trust this to work as expected.