COMPUTED TOMOGRAPHY || 100% ACCURATE.
what term is applied to a single square, or picture element, in the image display matrix correct
answers pixel
what determines the amount of data displayed on the monitor correct answers field of view
a volume element is called correct answers voxel
a relative comparison of x-ray attenuation of a voxel of tissue to an equal volume of water
correct answers CT number
what is the CT number of water correct answers 0
the major system components of a CT scanner correct answers gantry
computer and operators console
patient table
a circular device that houses the x-ray tube, DAS, and detector array is called correct answers
gantry
x-ray tubes used in advanced CT scanners can tolerate correct answers 4 to 5 MHU
these can be selected at the operators console correct answers slice thickness
table index
imaging technique factors
the range of CT numbers that are used to map signals into shades of gray is called correct
answers window width
the midpoint of the range of gray levels to be displayed on the monitor is the correct answers
window level
a narrow window width would display correct answers high contrast
the window level should be set to correct answers the CT number of the tissue of interest
CT is the examination of choice for correct answers head trauma
the amount of blurring in a CT image is termed correct answers spatial resolution
the ability to differentiate between small differences in density within the CT image is called
correct answers contrast resolution
the most significant geometric factor that contributes to spatial resolution correct answers
detector aperture width
, random variation in photon detection results in correct answers quantum noise
these contribute to image noise in CT correct answers detector aperture width
matrix size
patient size
metallic objects, such as dental fillings can cause correct answers artifacts
high resolution CT scans are made using correct answers thinner sections or slices
which are quality factors affected by x-ray beam energy correct answers contrast resolution
noise
which image quality factor is affected by focal spot size correct answers spatial resolution
tissue density differences of less than ___ can be distinguished by CT correct answers .5%
reconstruction algorithm affects all of the image quality factors expect for correct answers
artifacts
the image that appears o the monitor depends on the correct answers display field of view
what is based on the principle that different structures enhance at different rates after contrast
administration correct answers dynamic scanning
what new CT data acquisition method involves continuous gantry rotations combined with
constant table movement through the aperture correct answers spiral or helical CT
which 3-D imaging technique is commonly used for CTA correct answers maximum intensity
projection
these are methods of 3-D reconstruction correct answers maximum intensity projection
volume rendering
shaded surface display
how often do most CT systems require preventive maintenance to ensure proper operation
correct answers weekly to biweekly
all of these affect radiation dose in CT correct answers beam energy
tube current
section/slice thickness
the anatomic scan range for a basic head CT is from the ____ to the ___ correct answers base of
skull
vertex of head
what term is applied to a single square, or picture element, in the image display matrix correct
answers pixel
what determines the amount of data displayed on the monitor correct answers field of view
a volume element is called correct answers voxel
a relative comparison of x-ray attenuation of a voxel of tissue to an equal volume of water
correct answers CT number
what is the CT number of water correct answers 0
the major system components of a CT scanner correct answers gantry
computer and operators console
patient table
a circular device that houses the x-ray tube, DAS, and detector array is called correct answers
gantry
x-ray tubes used in advanced CT scanners can tolerate correct answers 4 to 5 MHU
these can be selected at the operators console correct answers slice thickness
table index
imaging technique factors
the range of CT numbers that are used to map signals into shades of gray is called correct
answers window width
the midpoint of the range of gray levels to be displayed on the monitor is the correct answers
window level
a narrow window width would display correct answers high contrast
the window level should be set to correct answers the CT number of the tissue of interest
CT is the examination of choice for correct answers head trauma
the amount of blurring in a CT image is termed correct answers spatial resolution
the ability to differentiate between small differences in density within the CT image is called
correct answers contrast resolution
the most significant geometric factor that contributes to spatial resolution correct answers
detector aperture width
, random variation in photon detection results in correct answers quantum noise
these contribute to image noise in CT correct answers detector aperture width
matrix size
patient size
metallic objects, such as dental fillings can cause correct answers artifacts
high resolution CT scans are made using correct answers thinner sections or slices
which are quality factors affected by x-ray beam energy correct answers contrast resolution
noise
which image quality factor is affected by focal spot size correct answers spatial resolution
tissue density differences of less than ___ can be distinguished by CT correct answers .5%
reconstruction algorithm affects all of the image quality factors expect for correct answers
artifacts
the image that appears o the monitor depends on the correct answers display field of view
what is based on the principle that different structures enhance at different rates after contrast
administration correct answers dynamic scanning
what new CT data acquisition method involves continuous gantry rotations combined with
constant table movement through the aperture correct answers spiral or helical CT
which 3-D imaging technique is commonly used for CTA correct answers maximum intensity
projection
these are methods of 3-D reconstruction correct answers maximum intensity projection
volume rendering
shaded surface display
how often do most CT systems require preventive maintenance to ensure proper operation
correct answers weekly to biweekly
all of these affect radiation dose in CT correct answers beam energy
tube current
section/slice thickness
the anatomic scan range for a basic head CT is from the ____ to the ___ correct answers base of
skull
vertex of head
