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Speed up MOLLI example #57

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ckolbPTB merged 1 commit into from
Jan 30, 2026
Merged

Speed up MOLLI example #57

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14 changes: 3 additions & 11 deletions examples/t1_molli_bssfp.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,7 @@
"metadata": {},
"outputs": [],
"source": [
"image_matrix_size = [128, 128]\n",
"image_matrix_size = [64, 64]\n",
"\n",
"tmp = tempfile.TemporaryDirectory()\n",
"fname_mrd = Path(tmp.name) / 't1_molli.mrd'"
Expand Down Expand Up @@ -140,7 +140,7 @@
"outputs": [],
"source": [
"mr0_sequence = mr0.Sequence.import_file(str(fname_seq.with_suffix('.seq')))\n",
"signal, ktraj_adc = mr0.util.simulate(mr0_sequence, phantom, accuracy=1e-1)\n",
"signal, ktraj_adc = mr0.util.simulate(mr0_sequence, phantom, accuracy=1e-2)\n",
"mr0.sig_to_mrd(fname_mrd, signal, sequence)"
]
},
Expand Down Expand Up @@ -270,15 +270,7 @@
"\n",
"relative_error = np.sum(np.abs(t1_input - t1_measured)) / np.sum(np.abs(t1_input))\n",
"print(f'Relative error {relative_error}')\n",
"assert relative_error < 0.15"
]
},
{
"cell_type": "markdown",
"id": "19",
"metadata": {},
"source": [
"The T1 times of the cerebrospinal fluid are much longer than the T1 times expected in the heart. They cannot be accurately estimated with this cardiac MOLLI sequence."
"assert relative_error < 0.08"
]
}
],
Expand Down
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