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MRI Glossary

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	Date/Time	Made By	Edit Note	Type	Scope
	Jul 15 2011, 7:54 AM EDT	sumandhillonz		edit	2 words added 2 words deleted
Change: RepitionRepetition Time (TR) shortening.Echo - Characteristic signal received during spin-echo sequence following refocussingrefocusing with 180 degree pulse - shaped like two back to back Free Induction Decay (FIDs).First Echo Image - Also known as a 'Proton Density' image View changes from previous version. (Word count: 356)
	Jan 11 2011, 1:25 PM EST	AndyC		edit
Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 356)
	Jun 20 2009, 12:17 AM EDT	eliseleblanc	Added 2 definitions and reference	edit	70 words added
Change: magnetic gradientSignal Averaging - An SNR-enhancing technique in which the same MRI signal is repeatedly acquired tow or more times and then combined and averaged. (1)References1. Bontrager, K. L., & Lampignano, J. P. (2005). Textbook of Radiographic Positioning and Related Anatomy 6th edition. Elsevier Mosby View changes from previous version. (Word count: 356)
	Jul 23 2006, 1:56 PM EDT	AndyC		edit	127 words added
Change: dependent on position.Gauss - Unit of magnetic field strength. 1 Gauss = 1/10,000 Tesla. The earths magnetic field varies from about 0.3 to 0.7 Gauss. (Pacemaker line = 5 Gauss).Gradient Echo Imaging - Method of producing an echo by reversing the direction of a magnetic gradient View changes from previous version. (Word count: 287)
	Jul 23 2006, 1:43 PM EDT	AndyC		edit	93 words added
Change: - Radio Frequency (RF) interference between adjacent slices due to non rectangular RF pulse profiles. This may result in loss of signal and Repition Time (TR) shortening.Echo - Characteristic signal received during spin-echo sequence following refocussing with 180 View changes from previous version. (Word count: 163)
	Jul 23 2006, 1:36 PM EDT	AndyC		edit	80 words added
Change: = the number of phase encoded lines of the matrix. Two or more sets may be averaged to improve signal to noise ratio.Amplitude - Maximum value - eg the peak of an echo.Angular Magnetic Moment - Magnetic property which produces a magnetic View changes from previous version. (Word count: 74)
	Jul 23 2006, 1:31 PM EDT	AndyC		create	No content added or deleted.
Change: Created by AndyC Jul 23 2006, 1:31 PM EDT for: no reason given

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