CMR
Acquisition time
1/ETL
NPE
NAcqs
Echo duration for sampling time
increase sampling freq to reduce
higher receiver bandwidths
Stronger gradients
TE
asymmetric/partial Echos with zero filling
Stronger gradient
Faster slew rates
RF duration
Shorten RF duratin by
Assymetric RF pulses
Stronger slice select gradients
Shorter gradients
Higher transmitter bandwidths
Thickness of slice desired
constrained by max gradient strength
In spin echo TR affects image contrast hence dont change
only reduce TR for GRE for faster imaging
Higher receiver bandwidth reduces..
but also reduces SNR
Signal to noise ratio
1/noise
Signal
square root of time to acquire data
Magnetization
Volume of voxel
intrinsic characteristics of magnetization
Way in which RF pulses/gradients applied
C
receiver coil sensitivity to signal
constant
Temporal resolution
only relevant in Cine imaging
No of views/segment
TR
Spatial resolution
- for higher spatial res, use smaller FOV the higher the number the lower the sptial resolution
1/ no of voxels in the image
Inverse relationship between SNR and spatial resolution!
FOV
