Homework-9: Artifacts

  1. What will the raw (k-space) data look like that produced the diagonal banding in this image?

  2. A magnetic resonance image is collected with the following acquisition parameters: Thk = 5 mm, Matrix = 256x128 pixels, and FOV = 20 cm. What is the size of the voxel in this image? Which direction has the best resolution?

  3. A image is acquired with the following parameters: Matrix = 256x256 pixels, FOV = 20 cm, sampling rate in the frequency encoding direction = 15.625 kHz, . What is the size in pixels of the chemical shift artifact?

  4. Why are blood vessels typically dark in single-slice spin-echo images, and sometimes dark or bright in multi-slice spin-echo images?