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CT image production questions & correct answers rated A+
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CT image production questions & correct answers rated A+
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CT image productionData Acquisition - correct answer ✔✔The measurement of the attenuation that occurs along each path
through the patient from Xray tube to detector
Data reconstruction - correct answer ✔✔The computerized processing of the transmission
measurements into the CT image
Multidimensional image display - correct answer ✔✔Display of reconstructed grayscale image in two
dimensional or three-dimensional format
Image archival and communication - correct answer ✔✔Display as well storage, both short term and
long term of images on computer workstations
Azimuth - correct answer ✔✔The angle of the tube and detectors in relationship to the patient position
during scout acquisition
Slip ring technology - correct answer ✔✔eliminates the need for cables by utilizing a system of contact
brushes that supply electricity to power the system and enable the passage of transmission data to the
computer
flying focal spot - correct answer ✔✔Involves the electromagnetic steering of the electrons beam
emitted from the cathode, the beam of electron is directed toward two desperate locations on the
rotating anode, resulting in two sources of x-radiation
photon flux - correct answer ✔✔the rate at which the photon fluence passes through a unit area over
unit time
photon fluence - correct answer ✔✔the mAs value directly controls the quantity of x radiation
, Effective mAS - correct answer ✔✔the calculated mAs per acquired slice with a multislice CT (MSCT)
system.
Half Value Layer (HVL) - correct answer ✔✔the thickness of material that , when placed in the path of
the x-ray beam, reduces the exposure rate by one-half.
z-axis - correct answer ✔✔The thickness of the plane (slice)
detector collimation - correct answer ✔✔The process of determining section width in the MDCT
Sectional interval - correct answer ✔✔The spacing between two adjacent CT images. It measure the
distance between the center of one section and the center of the next adjacent.
Contiguous images - correct answer ✔✔CT images acquired with equal section thickness and
reconstruction intervals
Non contiguous images - correct answer ✔✔Are those acquired with an interval greater than the section
width
overlapping images - correct answer ✔✔Are reconstructed with a section interval that is less than the
section width.
Adaptive collimation - correct answer ✔✔System to reduce z-axis overscanning by blocking the portion
of the beam that would potentially expose tissues outside of the desired acquisition volume
detector configuration - correct answer ✔✔the number, length, and organization of the individual
detector elements in an MSCT system
Binning - correct answer ✔✔the process of electronically combining signal from adjacent detector
elements to produce a reconstructed CT image that is thicker than the individual detector width
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