BIOE 415 Lab 11
Section AB3
Michael Spillone and Andrew Wu
Introduction:
Methods:
All protocols were followed as stated in the online experiments.
Results:
MRI Encoding V Spatial Resolution:
1.
Increasing spatial resolution in the frequency encoding direction does not contribute very
much to acquisition time since it only requires a higher sampling rate. From the basic
imaging pulse sequence, one can see that increasing the number of frequency encodings
has no bearing on the acquisition time Tacq.
2.
Gibb’s ringing is a more serious problem in the phase encoding direction because it is
more pronounced with fewer k space encoding points. From the basic imaging pulse
sequence, we know that we are limited by acquisition time in terms of how many phase
encoding points we can create thus the phase encoding direction has more Gibb’s ringing
artifact.
3.
The SNR per pixel is given by the following three identical equations:
From the equations, it is easy to see that as the number of encoding points, N, increases, the SNR
decreases.
4.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '10
 Cahler
 Gibb, phase encoding direction

Click to edit the document details