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CT SCAN QUIZ QUESTIONS AND ANSWERS
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CT SCAN QUIZ QUESTIONS AND ANSWERS
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CT SCAN QUIZ QUESTIONS ANDANSWERS
The assigned number that is related to the linear attenuation coefficient of the tissue
within each voxel - answer-ct number
Opening in the center of the gantry - answer-aperture
Ct number of water - answer-zero
T or f a pt with a pacemaker can have a ct scan - answer-true
Circular device that houses the xray tube - answer-gantry
Single square or picture element within a matrix - answer-pixel
Amount of blurring detail and sharpness - answer-spatial resolution
Caused most common by quantum noise - answer-noise
T or f an arterial puncture is made for ct - answer-false
Range of ct numbers used to map signals into shades of gray - answer-window width
Dental fillings or a pacemaker can cause - answer-artifact
The process of creating a cross sectional tomographic plane of the body - answer-
computed tomography
Measures the radiation that exits the patient - answer-detectors
An array of numbers in a grid of rows and colums - answer-matrix
Midpoint of the gray range ,controls image brightness - answer-window level
Volume of tissue, product of pixel area and slice thickness - answer-voxel
Amount of data displayed on a monitor - answer-field of view
Technique that allows the contrast of image to be altered - answer-windowing
This sends information, or primary data to computer - answer-detector assembly
Computer uses to compile and calculate data - answer-algorithm
, Computer assembles data into matrix to form - answer-axial image
In the body the point of reference is - answer-anatomical position
Xray tube --> detector assembly--> primary data--> - answer-algorithm-->matrix-->axial
image on crt
The most frequently used section in imaging modalities -
answer-axial/transverse/horizontal plane
Specific sagittal plane that passes through the midline is - answer-midsagittal ( all
others are parasagittal)
Who developed ct - answer-godfrey hounsfield and allan cormack in 1970
1st brain tissue scanner was in - answer-1971
In 1973 - answer-united states first ct in mayo clinic
T or f first units were dedicated head scanners - answer-true
The whole body ct was developed in - answer-1974
Ct was first categorized as - answer-generations, now their by tube and detector
movement
First generation had how many detectors - answer-1 to 3, limited to brain, 3 to 5 min per
slice
Second generation had how many detectors - answer-30 detectors, 20 sec per slice
Third generation scanner - answer-750 to 950 detectors, 1 to 10 sec per slice
Fourth generation - answer-1000 detector, 1 to 10 sec per slice
T or f both 3rd and 4th designs used today - answer-true
This ct obtains lg amount of data in a short time and scans volume of tissue not
individual - answer-spiral/helical ct
Advantages of spiral/helical ct - answer-motion minimized,detects small lesions,useful
for uncooperative patients and decrease amount of contrast
Latest technology is - answer-volume ct
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