Computed Tomography Workbook questions well answered

Computed Tomography Workbook
questions

What term is applied to a single square, or picture element, i the image display matrix?

a. CT number

b. hounsfield unit

c. pixel

d. raw data - correct answer ✔✔c



What determines the amount of data displayed on the monitor?

a. number of volume elements

b. pixel size

c. tissue density

d. FOV - correct answer ✔✔d



A volume element is called a:

a. pixel

b. voxel

c. matrix

d. CT number - correct answer ✔✔b



What is the CT number of water?

a. -1000

b. -500

c. 0

d. 1000 - correct answer ✔✔c

, Which of the following are the major system components of a CT scanner?

a. gantry, computer and operator's console, and patient table

b. monitor, gantry, and aperture

c. computer and operator's console, patient table, and DAS

d. patient table, computer, and 3-D reconstruction algorithms - correct answer ✔✔a



A circular device that houses the x-ray tube, DAS, and detector array is called the:

a. gantry

b. computer

c. aperture

d. algorithm - correct answer ✔✔a



X-ray tubes used is advanced CT scanners can tolerate:

a. 0.5 to 1.5 million heat units (MHU)

b. 2 to 3 MHU

c. 4 to 5 MHU

d. 6 to 10 MHU - correct answer ✔✔c



Which of the following can be selected at the operator's console?

1. slice thickness

2. table index

3. imaging technique factors



a. 1 and 2 only

b. 1 and 3 only

c. 2 and 3 only

d. 1, 2, and 3 - correct answer ✔✔d



The range of CT numbers that are used to map signals into shades of gray is called the: