By Dominik Weishaupt MD, Victor D. Köchli MD, Borut Marincek MD (auth.)
It is with nice excitement that we current this thoroughly revised English e- tion of our e-book How Does MRI paintings? An advent to the Physics and serve as of Magnetic Resonance Imaging in basic terms years afer ebook of the frst English version. we're really happy that our introductory textbook met with nice approval within the English-speaking global and never simply within the German-speaking nations. Tis good fortune has been a massive - centive for us to additional increase and replace the textual content. therefore, we're now featuring a moment variation. All chapters were completely revised and up-to-date to incorporate the newest advancements within the ever-changing feld of MRI expertise. particularly, the bankruptcy on cardiovascular imaging has been stronger and elevated. We gratefully recognize the contribution of Daniel Nanz, PhD, the writer of this bankruptcy. additionally, thoroughly new chapters were additional: “Fat Suppression recommendations” and “High- box medical MR Imaging”. although those additions, the meant readership of our e-book is still an analogous: it isn't a e-book for MR experts or MR physicists yet for our scholars, citizens, and technologists, briefly, all those people who are attracted to MRI and are searhing for an easy-to-understand advent to the technical foundation of this imaging modality at first in their MRI education. Te moment English version provided the following corresponds to and looks including the thoroughly revised ffh German edition.
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Extra resources for How Does MRI Work?: An Introduction to the Physics and Function of Magnetic Resonance Imaging
E. 23). From what has been said so far, one might conclude that the matrix should be as large as possible in order to encompass a maximum of picture elements. This is true in terms of image resolution but the minimum pixel size is limited by the fact that, in general, SNR decreases with the size of the voxel. Another limiting factor is image acquisition or scan time, which increases in direct proportion to the matrix size. Scan time is the key to the economic efficiency of all MR systems and can be calculated by a simple equation.
Another limiting factor is image acquisition or scan time, which increases in direct proportion to the matrix size. Scan time is the key to the economic efficiency of all MR systems and can be calculated by a simple equation. Scan time = TR × number of phase-encoding steps × number of signal averages (NSA) [echo train length (ETL)]. 5 Factors Affecting the Signal-to-Noise Ratio 33 Fig. 21. Effect of the FOV on pixel size with the matrix size held constant Fig. 22. A smaller matrix size with the FOV held constant results in larger pixels and thus a poorer spatial resolution A “trick” can be used to achieve a high spatial resolution in a reasonable scan time.
3. Mitchell DG, Cohen MS (2004) MRI principles, 2nd ed. Saunders, Philadelphia Elster AD (1993) Gradient-echo MR imaging: Techniques and acronyms. Radiology 186:1 Haacke EM, Frahm J (1991) A guide to understanding key aspects of fast gradient echo imaging. J Magn Reson Imaging 1:621 8 Fast Pulse Sequences 57 8 Fast Pulse Sequences There are several reasons why it is desirable to speed up scanning. g. to track a contrast medium bolus. – Shorter acquisition is less prone to motion artifacts, which is especially important in uncooperative patients.