MR Pulse Sequences

SIEMENS Healthineers MR Pulse Sequences Basics Version 2020.05 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 2 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Sequences Spin Echo 90º 180º 90º The Spin Echo (SE) sequence is characterized by a 90° RF excitation pulse followed by a 180° RF rephasing pulse at GS TE/2 (Echo Time). GR This sequence of pulses makes it possible to acquire an GP echo in time TE, which will constitute a single line of the Fourier plane. This action will be repeated as many times FID as there are lines to acquire programmed in the sequence. Spinecho TE TR This repetition occurs at each time interval TR (Repetition time). 3 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Sequences Gradient Echo OL The gradient echo sequence (GRE) is characterized by an RF excitation pulse at an angle α followed by a bipolar GS reading gradient responsible for the gradient echo. GR Since this sequence does not have a refocusing pulse, it is GP more sensitive to the inhomogeneities of the B0 magnetic FID Gradientenecho field. Please note: To know the value of the in-phase or TE TR opposed-phase TE, all you need to do is move the mouse cursor to the number of the TE. @ 1.5T: opposed-phase TE 2.38 ms, in-phase TE 4.76 ms, and multiple @ 3T: opposed-phase TE 1.23 ms, in-phase TE 2.46 ms, and multiple 4 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Turbo Spin Echo – TSE 90" 180 180 180' 180' 180 180' 180º Segmentation of k-space T2 2D TSE allows the acquisition of several spin Echo 1 echoes (lines of space k) in a TR Echo 2 Echo 3 Echo 4 FID Echo Echo 2 Echo 3 Echo 4 Echo B Echo & Echo 7 Echo 5 PE Echo 6 Echo 7 TEeff 5 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Half Fourier Acquisition Single Shot Turbo Spin RF Echo – HASTE Gs 2D TSE with a high turbo factor: Acquisition of all the lines of the Fourier plane in a single TR GF Gp TTTTTT TT 6 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the 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 7 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Sampling Perfection with Application optimized 90º a1 12 .04 q10 a11 a12 a13 a14 a15 Contrasts using different flip angle Evolution – SPACE GEL ------. 3D TSE using variable tilt angles; available in T1, ----- T2, and DP contrast Fin Echo 2 Fohn G Echo 7 Echo 8 Echo 10 Echo 11 Echo 12 Echo 11 Echo 14 Echo 15 E TII GPE III E E TE 8 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the 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 GR Gp 22 MR 22 FID Gradient Echo FID TE TR 9 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Fast Imaging with Steady State Precession – FISP RF 2D/3D GRE with maintenance of the residual transverse magnetization at the end of each TR GS PS GR - -- PR Gp Pp MR 22 FID Gradient Echo FID TE- TR T 10 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Balanced state of the residual transverse a/2 +a magnetization and balanced gradients – RF - TrueFISP Gs 2D GRE with balanced gradients on the three axes allowing the collection of additional GR stimulated echoes PR GP MR FID FID FISP + PSIF FID - 1 x TR/2 n x TR -- - 11 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Constructive Interference with Steady State Precession – CISS RF a A High-resolution 3D GRE combining two TrueFISP acquisitions GS GP GR EG EG+ES/Esti 12 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Multi Echo Data Image Combination – MEDIC @,@1 a, q2 RF Gradient Moment Refocussing 2D/3D GRE combining the collection of several Gg (CMR) - flow compensation echoes at different TE GR PR Gp MR - FID 3. 6, FID 1. 2. 4. 5. effective TE TR 13 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Ultra Fast Gradient Echo – TurboFLASH SR / IR TurboFLASH readout SR / IR TR Sequence 2D GRE T1 Single Shot combined with RF 4ª 4ª 4ª 4ª Aª ........... an inversion recovery pulse 4 4444 ........ Galice Greadout Gphase TI M, acquisition 14 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Magnetisation Prepared Rapid Gradient Echo – IR Segmented 3D TurboFLASH readout IR MPRAGE TR RF Aª. 4.ª ........... TurboFLASH 3D sequence combined with an ........ inversion recovery pulse Galice ......... Greadout ...... Gphaxe TI M, acquisition 15 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Volumetric Interpolated Breath-hold RF Examination – VIBE a a 3D Flash sequence with the use of "zero filling" GS when filling the k-space GP GR 16 Effective Date: 10 SEP 2020 | HOOD05162003090637 © Siemens Healthineers, 2020 MR Pulse Sequences Basics – SIEMENS Healthineers Chronogram and the principle of the different sequences Echo Planar Imaging – EPI 90 RF Filling of the k space through continuous signal acquisition Ge GR Gp MR 17 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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