PT1 Chapter 1 & 2: GRE based RF sequences | K-Space trajectories Quiz Please purchase the course before taking this quiz. An MRI pulse sequence is a programmed set of changing magnetic gradients: it is a time description of RF, gradients and data acquisition. True False By repeating the phase encoding steps several times the spatial resolution of the reconstructed image is improved. True False Increasing the number of profiles/lines in the k-space improves the S/N Ratio. True False Reducing the R(p)FOV to 70% the distances between the phase encoding profiles/lines is reduced. True False The acquisition time is matrix-dependent. True False The k-space can be filled with a zig-zag method. True False The k-space contains the raw data of the whole object. True False The measurement values of the lower K-values in the K-space determine the detail image in the reconstructed image. True False The number of phase encoding steps in an MRI image using a matrix of 256×200 is 200. True False The parallel imaging technique can be applied using a linear surface coil. True False The raw (k-space) data can be saved after the acquisition. True False Using a linear (sequential) profile or gradient order, the k-space is filled from Ky=0 to the outer edges. True False Using a parallel imaging technique, (specifically the SENSE based technique) a R(p)FOV is scanned and Aliasing (folded back) is corrected during the reconstruction. True False Using a parallel imaging technique, the acquisition time is halved. True False Using a parallel imaging technique, the S/N ratio remains the same. True False Using a parallel imaging technique, the signal needs to be collected with a phased-array coil. True False Using the SMASH based parallel Imaging technique, we reduce the number of measured echoes in k-space. True False Which is true? With the Multi / Hyper Band as SMS, slices can be excited simultaneously. With the Multi / Hyper Band as SMS, slices can be excited very quickly one after the other. Which is true? K-space is a 1D line of possible RF wave numbers. K-space is two-dimensional for a 2D image. Which is true? The profile-gradient order has to do with the order of k-space lines acquired. The order of the k-space lines measured can be reconstructed differently and makes the gradient or profile order.
