By Catherine Westbrook
Highly recommended on the British scientific organization ebook Awards 2016
MRI at a Glance encapsulates crucial MRI physics wisdom. Illustrated in complete color all through, its concise textual content explains complicated details, to supply the precise revision relief. It contains subject matters starting from magnetism to safeguard, okay house to pulse sequences, and snapshot distinction to artefacts.
This 3rd version has been totally up to date, with revised diagrams and new pedagogy, together with fifty five key issues, tables, test suggestions, equations, and studying issues. there's additionally an improved word list and new appendices on optimizing snapshot caliber, parameters and trade-offs.
A significant other web site can be to be had at www.ataglanceseries.com/mri that includes animations, interactive a number of selection questions, and test easy methods to increase your individual MRI technique.
MRI at a Glance is perfect for scholar radiographers and MRI technologists, in particular these venture the yank Registry of Radiation Technologist (ARRT) MRI exam, in addition to different overall healthiness pros fascinated with MRI.
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Extra resources for MRI at a glance
In spin echo sequences this secondary effect is destroyed so that resonant (excitation) pulses only result in resonance, and rephasing pulses only result in rephasing spins to produce a spin echo. However, in the steady state these secondary effects are not eliminated and hence every RF excitation pulse applied both results in resonance (and therefore an FID when this pulse is removed) and also rephases any transverse magnetization to produce an echo. This occurs thus: • Every TR, an excitation pulse is applied.
The flip angle must shift only a minimum of the NMV towards the transverse plane. Small flip angles ensure that the majority of the net magnetization components remain in the longitudinal axis to prevent saturation. The flip angle must be small. • The TR must be long enough to prevent saturation but can be reduced without producing significant saturation because of the small flip angle. For T2* weighting: • TR: >50 ms (long) • Flip angle: <30° (small) • TE: 15 ms (relatively long) Proton density weighting • Select TR and flip angle to produce minimum T1 effects and a TE to produce minimum T2* effects.
The Z gradient alters the magnetic field strength along the Z axis. The Y gradient alters the magnetic field strength along the Y axis. The X gradient alters the magnetic field strength along the X axis. The isocentre is the centre of all three gradients. 4). There are only three gradients but they are used to perform many important functions during a pulse sequence. e. spatially locating a signal in three dimensions. In order to do this, three separate functions are necessary. Usually each gradient performs one of the following tasks.