By Val M. Runge
Award Winner, RSNA 2009!
This lavishly illustrated ebook makes use of high quality photos to give a pragmatic advisor to the physics of magnetic resonance. Written by way of the world over well known authors, the ebook locations an emphasis on studying visually via photographs of actual situations instead of via mathematical equations and gives the basic details had to in achieving the simplest pictures in daily medical perform. This version gains new photos and comprises details at the most recent technical advances within the box, discussing such very important themes as three T, particular absorption fee (SAR), arterial spin labeling, non-stop relocating desk MR, and time-resolved distinction better MR angiography.
Highlights:
- Concise chapters make tricky suggestions effortless to digest
- 400 fine quality photographs and illustrations show key concepts
This booklet is a important reference for radiologists and a very good source for citizens getting ready for board examinations. it's also excellent for MR technologists and scholars looking to totally comprehend the elemental rules underlying this crucial diagnostic tool.
Read Online or Download The Physics of Clinical MR Taught Through Images PDF
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Additional resources for The Physics of Clinical MR Taught Through Images
Sample text
The DEFT technique, also called RESTORE, DRIVE, and FR-FSE, has been implemented on 2D and 3D spin echo and fast spin echo sequence types with clinical applications in neurologic, orthopedic, and abdominal MRI. Fig. 1 37 18 Reordering: Phase Encoding With multiecho imaging (such as that employed with fast spin echo technique), where the signal contribution changes during data acquisition, the order in which each k-space line is acquired is an important factor in determining image contrast. Given that the low (central) k-space lines contain the information about the coarse structure (and thus contrast) of the objects within the slice, the echo time at which those k-space lines are acquired is called the effective echo time.
If fewer Fourier lines are measured, as in half-Fourier or parallel-imaging techniques, additional algorithms have to supplement the missing information. The important message is that the center of k space contains nothing other than the information of how much signal the whole excited slice is sending. Adjacent to the center of k space in either direction is the information about the coarse structures of the objects within the slice. The information about the requested highest resolution is found in the outer borders of k space.
1 40 41 Fig. 2 nasopharynx (Fig. 2A, white arrow). Illustrated is a small mass involving the tectum, causing obstruction of the cerebral aqueduct (Fig. 2B, black arrow). It is remarkable that the scan times in this instance were only 7 and 14 sec (per slice, with the images acquired at 3 T), despite the use of a 2-mm slice thickness for improved depiction of this anatomic region. HASTE also finds clinical applicability, as illustrated in Fig. 3, for rapid brain imaging in uncooperative patients.