.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "generated/gallery/14-bssfp/bssfp3D_sequence.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note :ref:`Go to the end ` to download the full example code. .. rst-class:: sphx-glr-example-title .. _sphx_glr_generated_gallery_14-bssfp_bssfp3D_sequence.py: ================== 3D balanced SSFP ================== A slab-selective low-flip-angle excitation and balanced Cartesian readout repeat with alternating RF phase and zero net gradient moment in every TR. The preserved transverse coherence establishes a high-SNR steady state governed by T2/T1 and off-resonance. A half-flip preparation reduces transient oscillation. 3D bSSFP is used for high-SNR structural imaging. .. GENERATED FROM PYTHON SOURCE LINES 12-32 .. GENERATED FROM PYTHON SOURCE LINES 33-38 Fully sampled acquisition ------------------------- Every ``(line, partition)`` view inside the ellipse inscribed in the phase-encode plane is acquired. .. GENERATED FROM PYTHON SOURCE LINES 38-46 .. code-block:: Python import pypulseqpp as pp from pypulseqpp.sequences import bssfp3D_sequence baseline = bssfp3D_sequence(n_x=160, n_y=160, n_z=32, tr=None) print(f"{baseline.num_blocks} blocks, {baseline.duration()[0]:.2f} s") .. rst-class:: sphx-glr-script-out .. code-block:: none 11985 blocks, 16.46 s .. GENERATED FROM PYTHON SOURCE LINES 47-49 Sequence diagram ---------------- .. GENERATED FROM PYTHON SOURCE LINES 49-52 .. code-block:: Python baseline.paper_plot() .. image-sg:: /generated/gallery/14-bssfp/images/sphx_glr_bssfp3D_sequence_001.png :alt: bssfp3D sequence :srcset: /generated/gallery/14-bssfp/images/sphx_glr_bssfp3D_sequence_001.png :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 53-57 Sampling order -------------- Colour encodes acquisition order in the phase-encode plane. .. GENERATED FROM PYTHON SOURCE LINES 57-60 .. code-block:: Python pp.plot.plot_kspace(baseline, color_by="order", plane="yz", show_trajectory=False) .. image-sg:: /generated/gallery/14-bssfp/images/sphx_glr_bssfp3D_sequence_002.png :alt: bssfp3D sequence :srcset: /generated/gallery/14-bssfp/images/sphx_glr_bssfp3D_sequence_002.png :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 61-67 Acceleration on both encoded axes --------------------------------- Subsampling the line and partition axes reduces the number of repetitions. TR, flip angle, RF phase alternation and the balanced gradient moments of each repetition are unchanged, so the steady state is the same. .. GENERATED FROM PYTHON SOURCE LINES 67-79 .. code-block:: Python alternative = bssfp3D_sequence(n_x=160, n_y=160, n_z=32, ry=2, rz=2, tr=None) .. rst-class:: sphx-glr-script-out .. code-block:: none blocks duration (s) acquisitions full 11985 16.46 3995 2 x 2 3837 5.27 1279 .. GENERATED FROM PYTHON SOURCE LINES 80-82 .. code-block:: Python pp.plot.plot_kspace(alternative, color_by="order", plane="yz", show_trajectory=False) .. image-sg:: /generated/gallery/14-bssfp/images/sphx_glr_bssfp3D_sequence_003.png :alt: bssfp3D sequence :srcset: /generated/gallery/14-bssfp/images/sphx_glr_bssfp3D_sequence_003.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-timing **Total running time of the script:** (0 minutes 23.226 seconds) .. _sphx_glr_download_generated_gallery_14-bssfp_bssfp3D_sequence.py: .. only:: html .. container:: sphx-glr-footer sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: bssfp3D_sequence.ipynb ` .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: bssfp3D_sequence.py ` .. container:: sphx-glr-download sphx-glr-download-zip :download:`Download zipped: bssfp3D_sequence.zip ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_