ENCODING AND IMAGE FORMATION

  1. the z gradient alters the ______ axis of magnet 
    the y gradient alters ______ axis of magnet
    the x gradient alters ______ axis of magnet
    • z = longitudinal 
    • y = vertical 
    • x = horizontal
  2. what is the point of all three gradients and the bore of the magnet
    isocentre
  3. the isocenter is of what value
    same value is b0 external field strength aka tesla strength
  4. what is slice selection
    locating a slice within the scan plane selected
  5. what is frequency encoding
    spatially locating a signal along the long axis of the anatomy
  6. what is phase encoding
    locating signal along the short axis of the antomy
  7. z gradient ______ slices 
    x gradient _______ slices 
    y gradient _______ slices
    • z axial slices 
    • x = sagittal slices 
    • y = coronal slices
  8. what is k space
    when data is collected the information is stored as data points in the array processor of the computer
  9. what are the two longitudinal and transverse axis of k space
    • longitudinal is =phase axis 
    • transverse = frequency axis
  10. what is the unit for k space
    radians per cm
  11. the lines in the top half of k space are ______
    the bottoms are ___
    • positive 
    • negative
  12. what is NEX
    number of excitaitons or number of signal averages that each line is filled with data
Author
MriSensei
ID
338426
Card Set
ENCODING AND IMAGE FORMATION
Description
MRI
Updated