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NEX/NSA EXAM 2024/2025 WITH CORRECT ANSWERS
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If you double NEX, how much will the SNR and scan time increase. correct answersSNR will increase 140% and scan time will double What does NEX/NSA represent and used for correct answersRepresents the number of times each line of K space data is aquired and used to improve SNR ratio If you sca...

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  • September 20, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • NEX/NSA
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NEX/NSA

If you double NEX, how much will the SNR and scan time increase. correct answersSNR will increase
140% and scan time will double



What does NEX/NSA represent and used for correct answersRepresents the number of times each line of
K space data is aquired and used to improve SNR ratio



If you scan time of 2 minutes and NEX of 1 and SNR of 1. What would happen to all scan time and SNR if
NEX increase from 1 to 2? correct answersScan time will increase to 4 minutes and SNR will increase
140% to 1.4



Would NEX be used to increase or decrease SNR in high resolution imaging with a small FOV? correct
answersIncrease NEX to increase SNR in high resolution small FOV imaging



What is 1 major disadvantage of increasing NEX correct answersSignificant increase in scan time



Increasing or decreasing the NEX would help reduce motion and pulsation artefacts? correct
answersIncrease NEX, but would also increase scan time



If you reduce slice thickness, what will happen to SNR? How will you compensate? What will be
affected? correct answersYou will have a decrease in SNR, and compensate by increasing NEX, which will
also increase scan time



How does NEX effect FOV?

Smaller FOV?

Large FOV? correct answersSmall FOV, reduces pixel size which reduces SNR. Need to increase NEX



Large FOV, increase scan time and SNR. Need to reduce NEX

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