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computed tomography questions with correct answers resptively.
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computed tomography questions withcorrect answers resptively.
what term is applied to a single square, or picture element, in the image display matrix ANS - pixel
what determines the amount of data displayed on the monitor ANS - field of view
a volume element is called ANS - voxel
a relative comparison of x-ray attenuation of a voxel of tissue to an equal volume of water ANS - CT
number
what is the CT number of water ANS - 0
the major system components of a CT scanner ANS - gantry
computer and operators console
patient table
a circular device that houses the x-ray tube, DAS, and detector array is called ANS - gantry
x-ray tubes used in advanced CT scanners can tolerate ANS - 4 to 5 MHU
these can be selected at the operators console ANS - slice thickness
table index
imaging technique factors
the range of CT numbers that are used to map signals into shades of gray is called ANS - window width
, the midpoint of the range of gray levels to be displayed on the monitor is the ANS - window level
a narrow window width would display ANS - high contrast
the window level should be set to ANS - the CT number of the tissue of interest
CT is the examination of choice for ANS - head trauma
the amount of blurring in a CT image is termed ANS - spatial resolution
the ability to differentiate between small differences in density within the CT image is called ANS -
contrast resolution
the most significant geometric factor that contributes to spatial resolution ANS - detector aperture
width
random variation in photon detection results in ANS - quantum noise
these contribute to image noise in CT ANS - detector aperture width
matrix size
patient size
metallic objects, such as dental fillings can cause ANS - artifacts
high resolution CT scans are made using ANS - thinner sections or slices
which are quality factors affected by x-ray beam energy ANS - contrast resolution
noise
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