CMR

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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