Problem 10.9 Given the following imaging parameters, determine Tacq in each case. a) Find Tacq for a 2D spatial imaging experiment with Ny = 256 and TR 1000 ms. = b) Find Tacq for a 2D spatial 1D spectral CSI experiment with N N = 256 and TR 1000 ms. = = c) Find Tacq for a 3D spatial imaging experiment with N = Ny = 256, N = 128, and TR = 1000 ms. d) Find Tacq for a 4D imaging experiment with Nr = Ny = N = 16 and TR = 1000 ms. e) Discuss the implications of your results to the imaging of humans. Assume it is difficult for an average patient to stay in the imaging environment (lying still inside the bore of a magnet) for more than 30 minutes without becoming uncomfortable. Usually 10 minutes is assumed to be an upper limit for a single MRI scan. Assume also that you are imaging the entire human head which requires about 19.2 cm (left-to-right) x 25.6 cm (head-to-foot with oversampling) x 22.4 cm (front-to-back) of total spatial coverage. Given that the spatial resolution, as defined later in Ch. 13, is the ratio of FOV (the area over which the image is acquired) to number of encoded points, discuss the trade-off in spatial resolution versus imaging time in going from part (c) to part (d).