PEPconnect

MR Pulse Sequences Basic

This Job Aid provides an overview of MR Pulse Sequences.

SIEMENS Healthineers MR Pulse Sequences Basics Version 2020.05 USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Template Effective Date: 27 MAY 2019 | HOOD05162003010284 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Table of Contents Sequences 3 Chronogram and the principle of different sequences 5 USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Sequences • Spin Echo 900 90º • Spin Echo (SE) Sequence is characterized by a 90° 180º RF excitation pulse followed by a 180° RF rephasing pulse at TE/2 (Echo Time). GS • This sequence of pulses makes it possible to GR acquire an echo in time TE, which will constitute a single line of the Fourier plane. This action will GP be repeated as many times as there are lines to acquire programmed in the sequence. FID • This repetition occurs at each time interval TR (Repetition time). Spinecho TE TR USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Sequences • Gradient Echo • Gradient Echo Sequence (GRE) is characterized by an RF excitation pulse at an angle α followed by a bipolar reading gradient responsible for the gradient GS echo. GR • Since this sequence does not have a refocusing pulse, it is more sensitive to the inhomogeneities of GP the B0 magnetic field. FID Gradientenecho • Please note: To know the value of the in-phase or opposed-phase TE, all you need to do is move the mouse cursor to the number of the TE. TE • @1.5T: opposed-phase TE 2.38 ms, in-phase TE 4.76 ms, and multiple TR • @3T: opposed-phase TE 1.23 ms, in-phase TE 2.46 ms, and multiple USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Turbo Spin Echo (TSE) • 2D TSE allows the acquisition of 90' 180' 180" 180 180 180º 180 180' several spin echoes (lines of space k) in a TR Segmentation of k-space T2 Echo 1 Echo 2 Echo 3 Echo 4 FID Echo 1 Echo 2 Echo 3 Echo & Echo s Echo 7 Echo 5 PE Echo 6 Echo 7 TE USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Half Fourier Acquisition Single Shot Turbo Spin Echo – HASTE RF • 2D TSE with a High Turbo Factor: Acquisition of all the lines of the Fourier plane in a single TR Gs Gp USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Turbo Spin Echo with Motion Correction – BLADE • 2D TSE allowing the Fourier plane to be filled in "slides": Information redundancy at the center of the space k USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Sampling Perfection with Application optimized Contrasts using different flip angle Evolution – SPACE 90 a 16 110 011 a12 013 014 q15 • 3D TSE using variable tilt angles; available in T1, T2, and DP contrast GEL ILLIEBE+ CPE E TE USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Fast Low Angle Shot – FLASH RF • 2D/3D GRE T1 with destruction of the residual transverse magnetization at the end of each TR Gs GR Gp MR 22 FID Gradient Echo FID TE TR USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Fast Imaging with Steady State Precession – a FISP RF • 2D/3D GRE with maintenance of the residual transverse magnetization at the end GS - 22 of each TR PS GR ---- (PR Gp Pp MR 22 FID Gradient Echo FID TE-> -TR USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Balanced state of the residual transverse magnetization and balanced gradients – TrueFISP RF 2D GRE with balanced gradients on the GS • three axes allowing the collection of additional stimulated echoes GR Gp MR FID FID FISP + PSIF FID -1 x TR/2- n x TR USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Constructive Interference with Steady State Precession – CISS RF • High-resolution 3D GRE combining two TrueFISP acquisitions GS GP GR EG EG+ES/Estil USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Multi Echo Data Image Combination – MEDIC a,02 • 2D/3D GRE combining the collection of several echoes at different TE RF Gradient Moment Refocussing Gs (GMR) - flow compensation GR Gp Pp MR FID 2. 3. 5. 6. FID offective TE TR USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Ultra Fast Gradient Echo – TurboFLASH SR / IR TurboFLASH readout SR / IR TR • Sequence 2D GRE T1 Single Shot combined RF with an inversion recovery pulse 44444 Galice Greadout Gphase TI M, acquisition USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Magnetization Prepared Rapid Gradient IR Segmented 3D TurboFLASH readout IR Echo – MPRAGE TR RF • TurboFLASH 3D sequence combined with an inversion recovery pulse ........ Galice PPPAPA .......... Greadout TI M, acquisition USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Volumetric Interpolated Breath-hold Examination – VIBE RF • 3D Flash sequence with the use of "zero filling" when filling the k-space GS GP GR USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and Principle of Different Sequences • Echo Planar Imaging – EPI • Filling of the k space through continuous 90 signal acquisition RF Gg OR Gp LI MR USA HRT Effective Date: 1.5.2021 | HOOD05162003145818 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 SIEMENS Healthineers Please note that the learning material is for training purposes only! 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