the assigned number that is related to the linear attenuation coefficient of the tissue within each voxel correct answers ct number
opening in the center of the gantry correct answers aperture
ct number of water correct answers zero
t or f A pt with a pacemaker can have a CT scan correct a...
CT Scan || QUESTIONS WITH COMPLETE
SOLUTIONS!!
the assigned number that is related to the linear attenuation coefficient of the tissue within
each voxel correct answers ct number
opening in the center of the gantry correct answers aperture
ct number of water correct answers zero
t or f A pt with a pacemaker can have a CT scan correct answers true
circular device that houses the xray tube correct answers gantry
single square or picture element within a matrix correct answers pixel
amount of blurring detail and sharpness correct answers spatial resolution
caused most common by quantum noise correct answers noise
t or f An arterial puncture is made for CT correct answers False
range of CT numbers used to map signals into shades of gray correct answers window width
Dental fillings or a pacemaker can cause correct answers artifact
the process of creating a cross sectional tomographic plane of the body correct answers
computed tomography
measures the radiation that exits the patient correct answers detectors
an array of numbers in a grid of rows and colums correct answers matrix
midpoint of the gray range ,controls image brightness correct answers window level
volume of tissue, product of pixel area and slice thickness correct answers voxel
amount of data displayed on a monitor correct answers field of view
technique that allows the contrast of image to be altered correct answers windowing
this sends information, or primary data to computer correct answers detector assembly
computer uses to compile and calculate data correct answers algorithm
computer assembles data into matrix to form correct answers axial image
in the body the point of reference is correct answers anatomical position
the most frequently used section in imaging modalities correct answers
axial/transverse/horizontal plane
specific sagittal plane that passes through the midline is correct answers midsagittal ( all
others are parasagittal)
who developed CT correct answers godfrey Hounsfield and allan Cormack in 1970
1st brain tissue scanner was in correct answers 1971
in 1973 correct answers united states first Ct in mayo clinic
t or f First units were dedicated head scanners correct answers TRue
the whole body CT was developed in correct answers 1974
CT was first categorized as correct answers generations, now their by tube and detector
movement
first generation had how many detectors correct answers 1 to 3, limited to brain, 3 to 5 min
per slice
second generation had how many detectors correct answers 30 detectors, 20 sec per slice
third generation scanner correct answers 750 to 950 detectors, 1 to 10 sec per slice
fourth generation correct answers 1000 detector, 1 to 10 sec per slice
t or f Both 3rd and 4th designs used today correct answers True
this Ct obtains lg amount of data in a short time and scans volume of tissue not individual
correct answers Spiral/Helical CT
advantages of spiral/helical CT correct answers motion minimized,detects small
lesions,useful for uncooperative patients and decrease amount of contrast
latest technology is correct answers volume CT
volume ct has rows of elemts in the detector arrays correct answers 64
volume ct can image correct answers entire body sections on single breathe holding
VCT rapidly growing for correct answers cardiac imaging
contraindications to CT correct answers contrast allergies,pregnancy,diabetes,renal failure
and multiple myeloma
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