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Magnetic Resonance Imaging Sequences Gameplay, Trailers and Related Videos

Watch Cardiac Magnetic Resonance Imaging (MRI) Basic Principles (Dipan Shah, MD) Sep. 29, 2015 video.

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Watch Introducing MRI: Introduction to Pulse Sequences (30 of 56) video.

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An MRI sequence is a number of radiofrequency pulses and gradients that effect in a set of photos with a particular appearance. This article presents a simplified approach to recognizing common MRI sequences, but does not concern itself with the particulars of each sequence. abdominal mri sequences abdominal mri sequences radiology acronym mri sequences adni mri sequences advanced mri sequences all mri sequences ankle mri sequences aortic dissection mri sequences avascular necrosis mri sequences MRI Sequences MRI Signal production MRI Interpretation MRI Pulse Sequences T1, T2, PD weighted Imaging Spin Echo Fast and Ultrafast MRI Fast (Turbo) Spin echo Inversion recovery sequence STIR Sequences FLAIR Sequence Greadient sequence 3d greadient echo Echo planar imaging sequence Dynamic imaging basic mri sequences radiographics blade sequence mri blood mri sequences blood sensitive mri sequences Functional Imaging (fMRI) Diffusion weighted imaging (DWI) MR Spectroscopy Magnitization transfer (MT) MRI MRA & MRV MR Perfusion Susceptibility weighted imaging T1 rho imaging Fat Suppression imaging SPAIR SPIR Signal to noice ratio Radiofrequency (RF) coils Water excitation and Dixon Method MRI Abbreviation Overview The simplest method to think about the multitude of sequences accessible on modern scanners is to divide them according to the dominant influence on the appearance of tissues. This leads to a division of all sequences into proton density (PD) weighted, T1 weighted, T2 weighted, diffusion weighted, flow sensitive and 'miscellaneous'. A number of 'optional add-ons' can also be considered, such as fat or fluid attenuation, or contrast enhancement. This leads to a broad categorisation as follows: T1 gadolinium enhanced fat suppressed T2 fat suppressed fluid attenuated susceptibility sensitive proton density fat suppressed diffusion weighted flow sensitive MR angiography MR venography CSF flow studies miscellaneous MR cholangiopancreatography (MRCP) a unique T2-weighted sequence MR spectroscopy MR perfusion functional MRI tractography Terminology Intensity When describing most MRI sequences we refer to the shade of grey of tissues or fluid with the word intensity, leading to the following absolute terms: high signal intensity = white intermediate signal intensity = grey low signal intensity = black Often we refer to the appearance by relative terms: hyperintense = brighter than the thing we are comparing it to isointense = same brightness as the thing we are comparing it to hypointense = darker than the thing we are comparing it to Annoyingly these relative terms are used without reference to the tissue being used as the comparison. In some instances this does not lead to any issues; for example, a hyperintense lesion in the middle of the liver is clearly hyperintense compared to the surrounding liver parenchyma. In a lot of another situations however use of relative terms leads to potential confusion. Imagine a lesion within the ventricles of the brain described as "hypointense". Does this denote a lesion darker than CSF or than the adjacent brain? As such it is preferable to either use absolute terminology or, if using relative terms, to acknowledge the comparison tissue e.g. "the lesion is hyperintense to the adjacent spleen". NB: the word density is for CT, and there are few better methods to present yourself as an MRI noob than by making this mistake.