One of the most important developments in diagnostic imaging over
the last decade has been magnetic resonance imaging (MRI). Its
ability to differentiate between tissues and give patholog ical
information about diseases has led to earlier treatment, thus
increasing the likelihood of recovery. The images produced using
this technique give superb anatomical detail in any plane and are
obtained without the use of ionising radiation. The increased use
of MRI has presented radiographers with a number of challenges, and
because we are no longer dealing with ionising radiation
understanding the subject can some times be confusing. We hope that
this text will help radiographers and student radiographers to
further their knowledge and unravel the mysteries of MRI. Philip T.
English Christine Moore Contents 1 Basic Principles . . . . . . . .
. 1 History ..... . 1 Atomic Theory . . 1 Magnetic Theory . 2
Resonance 4 Relaxation. . . . . 5 2 Instrumentation........ 9 The
Magnet .. 9 Shim Coils ........... . 12 Gradient Coils ......... .
13 RF Transmitter/Receiver Coils. 14 The Computer . . . . . . . . .
18 3 Pulse Sequences. . . . . . . . . 19 Saturation Recovery
(Partial Saturation) 19 Spin Echo (SE) . . . . . . . . . . . . . 20
Multiple Spin Echo. . . . . . . . . . . 22 Fast Spin Echo (FSE) or
Turbo Spin Echo (TSE). 23 Inversion Recovery (IR) . . . . . . . . .
. . . . 26 Gradient Echo .................. . 28 Magnetisation
Transfer Contrast Imaging (MTC) 34 4 Image Production. . . . . . .
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