Questionnaire Name: Image Quality Questionnaire# 5 Questionnaire ID: Q1
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Primary Support Function (Modality) MR CT Nuclear Ultra Sound X-Ray Multi-modality Other
Service experience in MR: Less than 1 year 1-3 years 4-6 Years 7-10 Years 10-15 Years Over 15 years
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Question
1.
Image Quality Analysis is highly subjective and should not be used as the sole means to troubleshoot system performance problems.
2.
The most common image Ghosting produced by the Signa MR system is in the Frequency encoding direction.
3.
When troubleshooting Ghosting Artifacts, you may suspect the RF and Gradient Subsystem. Gradient and RF outputs must be extremely stable. A failure in the Envelope Feedback System could cause this problem.
4.
Zipper Artifact is a constant RF frequency that will display itself as a strait black and white line through the Field Of View. The RF Door is highly susceptible to "RF leakage" due to its constant use and subsequent wear.
5.
Distortions in the image could be caused by degraded shim.
6.
Signal Voids in a Head image can be caused by a large amount of dental fillings near the imaging Field Of View.
7.
The customer is complaining of poor SNR, grainy or "flat" looking images across many patient studies on all the coil configurations. The problem is most likely a bad Body Preamp.
8.
You run SPT on a PM and the data results indicate a System Gain Problem. (Required change too great) The system had passed this part of SPT many times before. It is possible that you have a faulty dynamic disable bias driver or Hybrid Splitter.
9.
An electrical arc generated by an electrical device near the MR system can cause Corduroy or Spike Noise artifact.
10.
The most likely cause of the corduroy artifact in any image, is due to the presence of a momentary high frequency short duration RF pulse within the receiver bandwidth. window.
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