MRI Quiz
Assuming all other parameters are the same, an echo time of _________ ms provides the best Signal-to-
Noise Ratio. correct answers15
Fat has a ______ T1 relaxation time and a ____ T2 relaxation time correct answersShort and Short
Water has a ____ T1 relaxation time and a ____ T2 relaxation time correct answersLong and Long
If the repetition time is doubled, the scan time will correct answersDouble: TR is directly porpotional to
scan time (TR x Phase Matrix x NEX)
Which of the following is NOT affected by changing the slice thickness correct answersThe T1 contrast
Which of the following would NOT compensate for the change in SNR as a result of decreasing the FOV?
correct answersReducing the number of excitations, A reduction in excitations (NEX/NSA) would reduce
SNR, which has the same effect as decreasing the FOV
Reducing the phase matrix from 256 to 192 will? correct answersAll the above
SNR increases with all the following adjustments, EXCEPT: correct answersDecreasing pixel size, smaller
pixel size; higher phase matrix; leads to improved resolution, but decreased SNR
Another name for a picture element is a correct answersPixel
What formula is used to calculate the size of the pixel correct answersFOV / matrix
Which parameter will provide the better spatial resolution correct answers4mm slice thickness; 256 x
256 matrix; thinner slices yield improved spatial resolution, in addition to smaller pixel size higher matrix
Assuming all other parameters are the same, an echo time of _________ ms provides the best Signal-to-
Noise Ratio. correct answers15
Fat has a ______ T1 relaxation time and a ____ T2 relaxation time correct answersShort and Short
Water has a ____ T1 relaxation time and a ____ T2 relaxation time correct answersLong and Long
If the repetition time is doubled, the scan time will correct answersDouble: TR is directly porpotional to
scan time (TR x Phase Matrix x NEX)
Which of the following is NOT affected by changing the slice thickness correct answersThe T1 contrast
Which of the following would NOT compensate for the change in SNR as a result of decreasing the FOV?
correct answersReducing the number of excitations, A reduction in excitations (NEX/NSA) would reduce
SNR, which has the same effect as decreasing the FOV
Reducing the phase matrix from 256 to 192 will? correct answersAll the above
SNR increases with all the following adjustments, EXCEPT: correct answersDecreasing pixel size, smaller
pixel size; higher phase matrix; leads to improved resolution, but decreased SNR
Another name for a picture element is a correct answersPixel
What formula is used to calculate the size of the pixel correct answersFOV / matrix
Which parameter will provide the better spatial resolution correct answers4mm slice thickness; 256 x
256 matrix; thinner slices yield improved spatial resolution, in addition to smaller pixel size higher matrix
