MRI Viva Questions (23/09/2004)
 What documentation would you consult regarding MRI safety? (NRPB, MHRA, BS EN 60601-2-33, mrisafety.com).
 What are the main areas considered in MRI safety? (5 areas).
 What is the SAR? What are its units?
 What factors influence the SAR?
 What is the limit for switching gradient fields?
 What about safety regarding pregnant staff?
 What would you advise to a female in the first trimester who presents with suspected disc compression?
 Would you recommend a CT scan or MRI? What factors are considered?
 What effects would a quench have on a patient left in the treatment room?
 Regarding my musculoskeletal images – what is a dual echo turbo spin echo sequence?
 How would you achieve FatSat using a spin echo sequence?
 What is STIR? How does it achieve fat suppression?
 How would you select TR and TE to get T1, T2 and PDW?
 What parameters would you measure during QA? (SNR, uniformity, linearity).
 Which do you consider the most useful?
 Define SNR.
 How would you determine SNR from your QA images? (Use ROI, SNR = 0.655(S)/σ).
 Why did you use one large ROI and not several small ones?
 What did you measure during your GE Signa Acceptance Testing?
 What instrument did you use to determine the 0.5mT isocontour? (Gauss Meter).
 What is the basic principle behind a Gauss Meter? (Hall Effect).
 Why are pacemakers a contraindication?
 What legislation is in place regarding health and safety at work?
 What about electrical safety?
 What about using hazardous substances? (COSHH).