By William Oldendorf M.D., William Oldendorf Jr. (auth.)
This booklet isn't meant as a common textual content on MRI. it's written as an intro duction to the sector, for nonexperts. We current right here an easy exposition of convinced points of MRI which are vital to appreciate to take advantage of this priceless diagnostic software intelligently in a medical environment. the fundamental ideas are offered nonmathematically, utilizing no equations and at least symbols and abbreviations. For these requiring a deeper figuring out of MRI, this publication can assist facilitate the transition to straightforward texts. Chapters 1 via four supply a basic creation to the phenomenon of nuclear magnetic resonance and the way it truly is utilized in imaging. bankruptcy 1 discus ses magnetic resonance, utilizing a compass needle to illustrate. In bankruptcy 2, the transition to the magnetic resonance of the atomic nucleus is made. bankruptcy three describes the rules of imaging. In bankruptcy four, the phrases T 1 and T 2 are defined and their dating to tissue characterization; the joys damental function of thermal magnetic noise in T 1 and T 2 is discussed.
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Extra info for Basics of Magnetic Resonance Imaging
The individual raindrops striking nearby cause a few discrete, loud sounds. Each raindrop is perceived as an individual event. This is analogous to the few large fluctuations caused by thermal noise originating nearby (the basis of T 2). The sound of distant rain is produced by very many raindrops, each of which is too distant to be audible individually, and which together create a constant hissing sound similar to that of steam escaping. This is analogous to lattice magnetic noise stimulating T 1 relaxation.
As will be seen in Chapter 4, the data-gathering strategy may be modified to display other tissue characteristics (Figure 18). In the case of CT, changes in direction of successive sweeps through tissue can be made only by physically moving the X-ray source. This greatly complicates design, construction, and maintenance and confines CT to imaging in the transverse plane. The change in direction of the magnetic field gradients in MRI scanning, however, does not require any physical movement, because it can be accomplished electronically using no moving parts.
This greatly complicates design, construction, and maintenance and confines CT to imaging in the transverse plane. The change in direction of the magnetic field gradients in MRI scanning, however, does not require any physical movement, because it can be accomplished electronically using no moving parts. Q H~ .... 0 .. D ,scalp 0 >- 0 x '- L position R frequency Figure 18. Because CT and MRI both take measurements along many lines crossing a plane of tissue, both use essentially the same computer algorithm to reconstruct an image.
Basics of Magnetic Resonance Imaging by William Oldendorf M.D., William Oldendorf Jr. (auth.)