MRI Introduction

  • William G. BradleyJr.

Abstract

The organization of the MR gamuts is heavily based on the appearance of lesions on T1- and T2-weighted images. For those readers less familiar with magnetic resonance imaging, let me add that a T1-weighted spin echo image is one with a short repetition time (TR) and a short echo delay time (TE) (which are both operator-selectable imaging parameters). (“Short” in the context of TR is less than 500 msec and “short” in the context of TE is ideally less than 20 msec — fora high-field system — or 30 msec for a low or mid field system.) T1-weighted gradient echo images are acquired with flip angles larger than 45° and echo delay times generally less than 10 msec. If the repetition times are less than 200 msec, then either RF or gradient spoiling should be used. Such T1-weighted gradient echo techniques are known as FLASH (Siemens), SPGR (for spoiled GRASS, GE), or RF-Spoiled FAST (Picker).

Keywords

Magnetic Resonance Image Adenoid Cystic Carcinoma Arachnoid Cyst Leptomeningeal Carcinomatosis Branchial Cleft Cyst 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1993

Authors and Affiliations

  • William G. BradleyJr.

There are no affiliations available

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