Questions

Answers

1. What is the meaning of contrast resolution in computed tomography (CT)?

1. the ability to differentiate small attenuation differences on the CT image

2. What is the meaning of spatial resolution?

2. the ability to discriminate between two adjacent objects; is a function of pixel size

3. What is the meaning of temporal resolution?

3. the precision of a measurement with respect to time

4. Define the terms “pixel” and “voxel.”

4. A pixel is a two-dimensional smallest sampled element in an image; a voxel is a three-dimensional smallest sampled element in an image.

5. Define the components of any X-ray energy spectrum.

5. The X-ray energy spectrum consists of bremsstrahlung or general continuous radiation and characteristic radiation.

6. What are Hounsfield units?

6. The Hounsfield unit (HU) scale is a linear transformation of the original linear attenuation coefficient measurement.