Medical Biophysics 4475A/B Study Guide - Final Guide: Spin Echo, Gamma Camera, Dead Time
22 May 2014
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An aid sheet (single side 8. 5 x 11 , hand written) and a calculator are allowed: magnetic resonance imaging (drangova) 1. 2 a vial of water is placed in a 1 t magnet. The sample"s nmr spectrum is recorded while a 5 g/cm frequency-encoding gradient is applied along the x-axis. Sketch, and clearly label, a pulse-sequence timing diagram for a 2d spin-echo image acquisition. You want to acquire a 2 dimensional image of a human chest (38 cm in the x direction and 20 cm in the y direction). The scanner operates at 3 t with gradient coils that cannot exceed 40 mt/m. The receiver samples the signal at a rate of. 32 khz, and the scan acquisition parameters are tr = 40 ms, te = 25 ms, nx = 256, Assume that the gradients can be turned on and off instantaneously. 2. 1 describe any two ct reconstruction artifacts and their causes.
