Questionnaire Name: EPI Questionnaire# 3 Questionnaire ID: E1
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Question
1.
During EPI sequences there seems to be an increase in variation in intensity from slice to slice. This could be caused by Auto Prescan variation.
2.
The Customer shows you an EPI sequence of scans that appear to have slice to slice intensity variation. The 3 main causes of this could be: Poor short term eddy current compensation. Incorrect values for psdRFWait and psdGradWait. Shorted RF shield.
3.
EPI images that appear to have dark curved Sat bands in them are most likely Operator induced.
4.
Pixel Voids in a Diffusion Weighted EPI (DWEPI) image have only two main causes: 1. Flow Motion and Low Signal.
5.
One of the things that you can do to begin troubleshooting a Ghosting issue found during EPI imaging is to run "System Health" to determine if you have current and valid EPI cal data.
6.
If you have a EchoSpeed Signa system a Fast Receiver is a necessary part of the receive chain.
7.
The ability to run EPI sequences and get good images is highly dependent on the EPI calibration data. One possible cause of poor EPI imaging could be a bad shim
8.
White Pixel or Spike Noise artifact may only show up during EPI imaging sequences. This is due to the higher demands this type of image generation places on the gradient subsystem and gradient coil.
9.
Your customer is complaining that during EPI sequences the images look distorted. It is highly possible that the best solution is to perform grafidy.
10.
Short Term Eddy Current Compensation values have a much larger impact on the quality of EPI images versus those images that used a standard Spin-Echo protocols.
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