Homework-5: FT Imaging Principles

  1. Two samples are located in a magnetic field at x=0 cm and x=5 cm. A 1 G/cm phase encoding gradient is applied in the +X-direction for 10 ms. How much phase will be acquired by the sample located at x=5 cm relative to that located at x=0 cm?

  2. You are using an imaging sequence that applies a slice selection gradient in the x direction, a phase encoding gradient in the z direction, and a frequency encoding gradient in the y direction. What type of imaging plane will be produced?

  3. A particular magnetic resonance imager uses a 2 G/cm frequency encoding gradient and a quadrature sampling rate of 32 kHz. What field of view will be obtained when imaging hydrogen?

  4. You wish to produce an image with a 4 cm FOV and 512 phase encoding gradient steps. The maximum phase encoding gradient you can produce is 2 G/cm. What should the width of the phase encoding gradient be?