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MRI QUIZ: QA/QC QUESTIONS AND ANSWERS WITH SOLUTIONS 2024 $11.99   Add to cart

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MRI QUIZ: QA/QC QUESTIONS AND ANSWERS WITH SOLUTIONS 2024

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MRI QUIZ: QA/QC QUESTIONS AND ANSWERS WITH SOLUTIONS 2024 Gradient amplitude is defined as the - ANSWER o Strength of the gradient The gradient rise time is defined as - ANSWER o the time it takes for the gradient to reach its full amplitude, measured in microseconds mT/m (milliTesla/meter) or ...

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  • October 18, 2024
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MRI QUIZ: QA/QC QUESTIONS AND ANSWERS
WITH SOLUTIONS 2024
Gradient amplitude is defined as the - ANSWER o Strength of the gradient



The gradient rise time is defined as - ANSWER o the time it takes for the gradient to reach its full
amplitude, measured in microseconds mT/m (milliTesla/meter) or G/cm (Gauss/centimeter)



What is the gradient slew rate - ANSWER o the speed rate of ascent or descent of a gradient from zero to
its maximum amplitude, either positive or negative. Which is the amplitude divided by the rise time in
msec. Measured in mT/m/msec or T/m/sec

o The strength of the gradient over a specific distance is another way to define the slew rate



Gradients with a shorter rise time will have _____ resolution capabilities and ____ available slices per TR
- ANSWER o Better, more



How can we convert T/M to gauss/cm ex 3.5 T/m - ANSWER o Move decimal two places to the right - 3.5
x 100 3.5 T/m = 350 Gauss / centimeter (G/cm)



What is the duty cycle - ANSWER o the time the gradients are on during a TR period, the "gradient
working time."



What parameters affect the duty cycle - ANSWER o Increasing number of slices

o Using FS sequences

o Using presat slabs/bands

o Increasing ETL



What is the primary cause of noise in the MR scan room - ANSWER o Rapid, successive switching of the
gradient coils



To get an oblique slice what must happen with the gradients - ANSWER o Both gradients in the planes
selected will come on during slice select

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