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:
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:
