.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "generated/gallery/11-spin-echo/se_epi_propeller2D_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_11-spin-echo_se_epi_propeller2D_sequence.py: ================================================ 2D PROPELLER spin echo with echo-planar blades ================================================ A slice-selective excitation and 180-degree refocusing pulse form a spin echo, followed by an echo-planar readout of one rotating PROPELLER blade. Spoilers suppress unwanted coherence between shots. TE controls T2 weighting, while the EPI train introduces off-resonance sensitivity. This sequence supports rapid, motion-robust structural imaging. .. GENERATED FROM PYTHON SOURCE LINES 12-32 .. GENERATED FROM PYTHON SOURCE LINES 33-37 Sixteen-line blades ------------------- Sixteen lines per blade, each blade acquired after one excitation. .. GENERATED FROM PYTHON SOURCE LINES 37-47 .. code-block:: Python import pypulseqpp as pp from pypulseqpp.sequences import se_epi_propeller2D_sequence baseline = se_epi_propeller2D_sequence( n_x=192, blade_width=16, n_slices=1, te=60e-3, tr=None, n_dummy=0 ) print(f"{baseline.num_blocks} blocks, {baseline.duration()[0]:.2f} s") .. rst-class:: sphx-glr-script-out .. code-block:: none 437 blocks, 1.46 s .. GENERATED FROM PYTHON SOURCE LINES 48-50 Sequence diagram ---------------- .. GENERATED FROM PYTHON SOURCE LINES 50-53 .. code-block:: Python baseline.paper_plot() .. image-sg:: /generated/gallery/11-spin-echo/images/sphx_glr_se_epi_propeller2D_sequence_001.png :alt: se epi propeller2D sequence :srcset: /generated/gallery/11-spin-echo/images/sphx_glr_se_epi_propeller2D_sequence_001.png :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 54-59 Sampling order -------------- Colour encodes blade acquisition order. All lines within one blade are acquired in a single echo train. .. GENERATED FROM PYTHON SOURCE LINES 59-62 .. code-block:: Python pp.plot.plot_kspace(baseline, color_by="shot", plane="xy") .. image-sg:: /generated/gallery/11-spin-echo/images/sphx_glr_se_epi_propeller2D_sequence_002.png :alt: se epi propeller2D sequence :srcset: /generated/gallery/11-spin-echo/images/sphx_glr_se_epi_propeller2D_sequence_002.png :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 63-69 Wider blades ------------ A wider blade requires a longer echo-planar train. Each blade covers more of the k-space disc, and more off-resonance phase accumulates across the blade's phase-encode direction. .. GENERATED FROM PYTHON SOURCE LINES 69-83 .. code-block:: Python alternative = se_epi_propeller2D_sequence( n_x=192, blade_width=24, n_slices=1, te=60e-3, tr=None, n_dummy=0 ) .. rst-class:: sphx-glr-script-out .. code-block:: none blocks duration (s) acquisitions 16 lines 437 1.46 304 24 lines 403 1.11 312 .. GENERATED FROM PYTHON SOURCE LINES 84-86 .. code-block:: Python pp.plot.plot_kspace(alternative, color_by="shot", plane="xy") .. image-sg:: /generated/gallery/11-spin-echo/images/sphx_glr_se_epi_propeller2D_sequence_003.png :alt: se epi propeller2D sequence :srcset: /generated/gallery/11-spin-echo/images/sphx_glr_se_epi_propeller2D_sequence_003.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-timing **Total running time of the script:** (0 minutes 2.204 seconds) .. _sphx_glr_download_generated_gallery_11-spin-echo_se_epi_propeller2D_sequence.py: .. only:: html .. container:: sphx-glr-footer sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: se_epi_propeller2D_sequence.ipynb ` .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: se_epi_propeller2D_sequence.py ` .. container:: sphx-glr-download sphx-glr-download-zip :download:`Download zipped: se_epi_propeller2D_sequence.zip ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_