18/ 20 Questions Category Q18. All effect image uniformity EXCEPT? Use of a flat surface coil Poor B0 Poor transmit field (nonuniform RF across slice) Using partial Fourier (e.g. halfscan)
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All effect image uniformity EXCEPT? Use of a flat surface coil Poor B0 Poor transmit field (nonuniform RF across slice) Using partial Fourier (e.g. halfscan) Show more…
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You are asked to design parameters for an abdominal MRI scan. A slice is selected by applying a magnetic z gradient along the body, such that the selected slice corresponds to a magnetic strength of 2.0 T. The size of the image is expected to be 25 x 25 cm. The time length of each received signal is 50 msec. The highest spatial frequency desired in the image is 1 mm^-1. The spatial frequency sampling desired is 0.01 mm^-1. Find with correct units: a) The spatial frequency gradient a b) The slice select frequency f0 c) The maximum precessing frequency fmax d) The maximum spatial frequency bmax e) The number of times to repeat the pulse sequence to build up a 2D FT f) The minimum time sampling frequency fs
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Thinner slices can be achieved by: - decreasing the transmit (RF) bandwidth - decreasing the receive (signal) bandwidth - increasing the slice-selection gradient strength - all of the above - only (a) and (b) - only (a) and (c)
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