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If a sequence with a matrix of 256 x 512 is adjusted to 512 x 512,
The SNR will decrease and the scan time will increase
The scan time of a fast spin echo sequence utilizing a TR of 3500ms, a TE of 90ms, a 256x256
matrix, 1NSA, a 220mm FOV and an echo train length of 5 is ______ minutes, approximately.
3
___________ does not aid in reducing scan time
reducing TE
The central lines of k-space are associated with _____________ in a fast spin echo sequence.
contrast information
Reducing the number of lines filled in k-space will produce an image:
With a decrease in spatial resolution
K-space is typically filled:
one line at a time
Lower bandwidth = ________ signal-to-noise = _______ chemical shift
higher; more
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, A ______________ is defined as a picture element and has _________ characteristics.
Pixel, two-dimensional
The maximum intensity projection algorithm:
Projects the high intensity pixels which represent blood vessels/ducts into one image
Two gradients applied at the same time during slice selection are utilized for:
Encoding oblique slice planes
The readout gradient is usually turned on during the sampling or readout of the peak echo and
also during which other process?
Frequency encoding
If the maximum slices in a set TR is 10, and the necessary number of slices for a given
sequence's anatomical coverage is 36, how many acquisitions (packages) will be required?
4
What effect would decreasing the FOV have on the spatial resolution of an image?
Increase
What effect would using a steep slice select slope and/or narrow bandwidth have on slice
thickness?
Slices will be thin
An isotropic voxel refers to a __________ shaped voxel.
cubic
If the radiologist requires 3mm slices axially acquired through the IAC, with a slice gap of
0.5mm, and requires 4.2cm total coverage, how many slices must be selected?
12
If 30 4mm slices are planned with a gap of 1mm, the total anatomic coverage is _______ cm.
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