Computed Tomography Questions with
Accurate Answers
a circular device that houses the x-ray tube, DAS, and detector array is called the
correct answer gantry
a narrow window width would display ___________ contrast correct answer high
a relative comparison of x-ray attenuation of a voxel of tissue to an equal volume
of water is a(n) correct answer CT numbers
a volume element is called a correct answer voxel
all of the following affect radiation dose in CT except
1. FOV
2. beam energy
3. tube current
4. section/slice thickness correct answer 1
ct is the examination of choice for ___________ trauma correct answer head
high-resolution CT scans are made using ___________ sections or slices correct
answer thinner
how often do most CT systems require preventive maintenance to ensure proper
operation correct answer weekly to biweekly
, metallic objects, such as dental fillings, can cause correct answer artifacts
random variation in photon detection results in correct answer quantum noise
reconstruction algorithm affects all of the image quality factors except for correct
answer artifacts
the amount of blurring in a CT image is termed correct answer spatial resolution
the anatomic scan range for a basic head CT is from the ______________ to the
____________ correct answer base of skull; vertex of head
the image that appears on the monitor depends on the correct answer display
field of view
the midpoint of the range of gray levels to be displayed on the monitor is the
correct answer window level
the range of CT numbers that are used to map signals into shades of gray is called
the correct answer window width
the the ability to differentiate between small differences in density within the CT
image is called correct answer contrast resolution
Accurate Answers
a circular device that houses the x-ray tube, DAS, and detector array is called the
correct answer gantry
a narrow window width would display ___________ contrast correct answer high
a relative comparison of x-ray attenuation of a voxel of tissue to an equal volume
of water is a(n) correct answer CT numbers
a volume element is called a correct answer voxel
all of the following affect radiation dose in CT except
1. FOV
2. beam energy
3. tube current
4. section/slice thickness correct answer 1
ct is the examination of choice for ___________ trauma correct answer head
high-resolution CT scans are made using ___________ sections or slices correct
answer thinner
how often do most CT systems require preventive maintenance to ensure proper
operation correct answer weekly to biweekly
, metallic objects, such as dental fillings, can cause correct answer artifacts
random variation in photon detection results in correct answer quantum noise
reconstruction algorithm affects all of the image quality factors except for correct
answer artifacts
the amount of blurring in a CT image is termed correct answer spatial resolution
the anatomic scan range for a basic head CT is from the ______________ to the
____________ correct answer base of skull; vertex of head
the image that appears on the monitor depends on the correct answer display
field of view
the midpoint of the range of gray levels to be displayed on the monitor is the
correct answer window level
the range of CT numbers that are used to map signals into shades of gray is called
the correct answer window width
the the ability to differentiate between small differences in density within the CT
image is called correct answer contrast resolution
