By Val M. Runge
Award Winner, RSNA 2009!
This lavishly illustrated publication makes use of high quality photographs to offer a realistic consultant to the physics of magnetic resonance. Written by means of across the world well known authors, the e-book locations an emphasis on studying visually via photos of genuine situations instead of via mathematical equations and offers the elemental info had to in achieving the simplest pictures in daily medical perform. This variation beneficial properties new photographs and contains details at the most modern technical advances within the box, discussing such very important themes as three T, particular absorption cost (SAR), arterial spin labeling, non-stop relocating desk MR, and time-resolved distinction better MR angiography.
- Concise chapters make tricky ideas effortless to digest
- 400 high quality pictures and illustrations exhibit key concepts
This ebook is a priceless reference for radiologists and a very good source for citizens getting ready for board examinations. it's also perfect for MR technologists and scholars looking to absolutely comprehend the fundamental rules underlying this crucial diagnostic tool.
Read Online or Download The Physics of Clinical MR Taught Through Images PDF
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Extra resources for The Physics of Clinical MR Taught Through Images
The pixel size (FOV/matrix) determines the in-plane resolution. Reducing the FOV, increasing the matrix number, or reducing the slice thickness results in an image with reduced voxel volume. SNR is directly proportional to voxel size (assuming that the number of phase-encoding steps is held constant). Small voxels produce MR images with high spatial resolution but lower signal-to-noise ratio (SNR) and thus may appear “grainy” compared with images acquired with a larger voxel volume. The images shown in Fig.
The spatial resolution is given by the selected field of view (FOV) divided by the matrix size in either direction. 4 illustrates how spatial resolution gradually improves with increasing numbers of Fourier lines around the center of k space. 19 To summarize a measurement (Fig. 5): 1. , z). 2. , it will tilt the longitudinal magnetization to become transverse magnetization). 3. A phase-encoding gradient, GP, will establish partial spatial information in the direction of the gradient. 4. A readout gradient, GR, will be activated to prepare the starting point for the first data point.
Thus the tissues of interest are critical to stating the CNR for an image, and an image may have high CNR for one type of comparison and low CNR for another. Lesion conspicuity is related to CNR. Of the three scan types illustrated, FLAIR demonstrates the highest CNR for MS plaques when compared with CSF and thus the widespread use of this technique for screening in MS of the brain. 1A and C depict the signal-to-noise ratio (SNR) for white (WM) and gray matter (GM) and their contrast-to-noise ratio (CNR) for identical measurement times, but different TR values.