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In which of the following circumstances is “breath stacking” most likely to occur in a mechanically ventilated patient?  

Which patients/situations are most likely to develop hypoxemia?

During NREM sleep, N3 is considered the deepest state of sleep. During this time, which waves are seen on an EEG tracing? (these demonstrate diminishing brain activity which suggests a restorative state) I. slow-wave sleep II. fast-wave sleep III. delta-wave sleep IV. alpha-wave sleep

The method of expressing a gamma camera’s ability to image an object as a funciton of the frequencies contained within the object is called: 

Which of the following critical frequency cut-off’s is likely to result in a SPECT image which is too smooth? 

If the range of Hounsfield numbers on the image is 0 to 200, a value of 250 will display as what color?

With regard to planar gamma camera imaging, the _________ assigns a particular shade of gray to a specific count-per-pixel value. Adjusting this will change the threshold of most intense pixels and increase or decrease the shades of gray visualized. 

Which of the following attenuation techniques provides the best quality images? 

An expected reading for a geometry test on a 5 ml syringe was 2.95 mCi. The actual reading is 2.63 mCi. Calculate the correction factor: 

Which of the following does NOT degrade contrast