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CT Image production

QuestionAnswer
_____________ refers to the number of xray photons produced in the beam Intensity
the _____ is the target of the electron stream and the actual source of xray photon creation anode
the ________ is the dedicated electronic circuit that allows the computer system to operate at high speeds, especially during data reconstruction Array processor
the ______ is responsible for converting the electrical signal from the detectors into a digital signal prepared for processing Data acquisition system (DAS)
_______ are responsible for converting remnant beam to an electrical signal Detectors
Information leaving the data acquisition system(DAS) is known as _____, which is a digital matrix of numbers Raw data
Which component of the CT scanner measures the radiation reading produced by the detector array? Data acquisition system (DAS)
Reconstruction of raw data into image data occurs inside the ________ Computer system
the ______er scanner can collect more anatomic information with each rotation of the tube, which results in faster scan time larger
The number of data acquisition channels (or slices) is `__________with change in image noise, spatial resolution, and contrast resolution not directly associated
In CT the x axis extends ___ Horizontally (right and left)
in ct the y axis extends _______ Vertically (anterior to posterior)
in ct the z axis extends ______ Longitudinally , (superior to inferior)
the amount of data collected per tube rotation in axial scanning is dependent on the number of ________ Activated detector rows
As aquisition thickness increases, patient exposure ________ decreases
combining detector rows _________ aquisition thickness Increases
as aquisition thickness increases, spatial resolution __________ Decreases
as pitch increases, spatial resolution __________ decreases
as pitch increases, patient dose __________ Decreases
as pitch decreases, spatial resolution _______ increases
helical scanning may slightly _______ spatial resolution decrease
as slice thickness increases, spatial resolution ______ decreases
what is the max size of scan field of view (SFOV) in most GE scanners? 50cm
GE scanners have a small SFOV of __cm and large SFOV of __cm 25 cm 50 cm
During axial CT, the patient table moves_____ foward between each sequential exposure
_____ is the ratio of table movement to the beam width pitch
pitch applies to _______ scanning only Helical
Pitch = table movement / beam width
 

 



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