By Catherine Westbrook
MRI at a Glance encapsulates crucial MRI physics wisdom. Illustrated in complete color all through, its concise textual content explains complicated info, to supply the precise revision reduction. It contains issues starting from magnetism to defense, okay house to pulse sequences, and photo 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, experiment assistance, equations, and studying issues. there's additionally an extended thesaurus and new appendices on optimizing photograph caliber, parameters and trade-offs.
A better half site can be to be had at www.ataglanceseries.com/mri that includes animations, interactive a number of selection questions, and test the best way to enhance your individual MRI technique.
MRI at a Glance is perfect for pupil radiographers and MRI technologists, specially these project the yankee Registry of Radiation Technologist (ARRT) MRI exam, in addition to different healthiness execs concerned with MRI.
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Additional resources for MRI at a Glance
Sample text
Published 2016 by John Wiley & Sons, Ltd. 1 Signal intensities seen in T2 weighted images. 1). 3). Typical values • TR: 2000+ ms (much shorter in gradient echo sequences) • TE: 70+ ms (shorter in gradient echo sequences) The principal pulse sequences that are capable of producing T2 weighted images are: • spin echo (see Chapter 13) • turbo spin echo (see Chapters 14 and 15) • STIR/FLAIR (see Chapter 16) The following pulse sequences produce T2* weighting that has similar characteristics in that water is bright.
The magnetic moments of the spins are dephased with a negative gradient pulse. The negative gradient slows down the magnetic moments of the slow spins even further, and speeds up the fast ones. This accelerates the dephasing process. The gradient polarity is then reversed to positive. The positive gradient speeds up the magnetic moments of the slow spins and slows down the fast ones. 3). This bi-polar application of the frequencyencoding gradient is required so that the magnetic moments of spins are in phase at the same time that the system is reading frequencies in the gradient echo.
STIR (short TI inversion recovery) uses a short TI such as 100– 180 ms, depending on field strength. A TI of this magnitude places the 90° excitation pulse at the time that the NMV of fat is passing exactly through the transverse plane. At this point (called the null point) there is no longitudinal component in fat. Therefore the 90° excitation pulse produces no transverse component in fat and therefore no signal. 3). FLAIR (fluid attenuated inversion recovery) uses a long TI such as 1700–2200 ms, depending on field strength, to null the signal from CSF in exactly the same way as the STIR sequence.