Mri at a Glance

by Catherine Westbrook (Senior Lecturer and MRI Field Leader at Anglia Polytechnic University, Cambridge)

• ISBN13: 9780632056194
• ISBN10: 0632056193
• Format: Paperback
• Copyright: 2002-07-01
• Publisher: Wiley-Blackwell

Summary

Students of radiology and radiography at both undergraduate and postgraduate level often experience difficulty in learning MRI techniques. This book provides concise, easily accessible information on MRI physics which can be used as a revision tool.Topics covered include relaxation processes, image contrast, pulse sequences, image production, image quality, artefacts, MRA, instrumentation and safety. Double page spreads for each section will contain a diagram and/or image depicting the main concepts of MR physics together with a succinct account of the topic in bullet points and tables.

Table of Contents

Preface	7	(1)
Glossary	8	(4)
Part 1: Fundamentals
Magnetism and electromagnetism	12	(2)
Atomic structure	14	(2)
Alignment and precession	16	(2)
Resonance and signal generation	18	(2)
Part 2: Image contrast
Contrast mechanisms	20	(2)
T1 recovery	22	(2)
T2 decay	24	(1)
T1 weighting	25	(1)
T2 weighting	26	(1)
Proton density weighting	27	(1)
Part 3: Pulse sequences
Pulse sequence mechanisms	28	(1)
Conventional spin echo	29	(3)
Fast or turbo spin echo	32	(2)
Inversion recovery	34	(2)
Gradient echo mechanisms	36	(4)
Coherent gradient echo	40	(1)
Incoherent sequences	41	(1)
Steady state free precession	42	(2)
Ultrafast sequences	44	(2)
Specialist sequences	46	(2)
Part 4: Image production
Gradient functions	48	(2)
Slice selection	50	(2)
Phase encoding	52	(1)
Frequency encoding	53	(1)
K space characteristics	54	(2)
Data acquisition	56	(5)
K space traversal	61	(3)
Part 5: Image quality
Signal-to-noise ratio	64	(2)
Contrast-to-noise ratio	66	(2)
Spatial resolution	68	(3)
Scan time	71	(1)
Trade-offs	72	(1)
Part 6: Artefacts
Chemical shift	73	(1)
Chemical misregistration	74	(1)
Magnetic susceptibility	75	(1)
Phase mismapping	76	(2)
Phase wrap/aliasing	78	(1)
Part 7: Angiography
Flow phenomena	79	(3)
Time of flight angiography	82	(2)
Phase contrast MRA	84	(2)
Contrast enhanced MRA	86	(1)
Part 8: Contrast media
Contrast media	87	(3)
Part 9: Instrumentation
Magnets	90	(2)
Radio-frequency coils	92	(2)
Gradients	94	(1)
Other hardware	95	(1)
Part 10: Safety
Bioeffects	96	(1)
Projectiles	97	(1)
Screening and safety procedures	98	(2)
Emergencies in the MR environment	100	(1)
Appendix	101	(4)
Index	105