Image quality
The ability to differentiate between objects of similar densities
What is low contrast resolution?
This scanner generation was only capable of scanning heads. It was known as the EMI scanner because this music company financed the research. It utilized only one or two detectors and was tranlate rotate only.
First Generation
The ability of a CT scanner to differentiate similar densities, as in the brain grey and white matter.
What is low contrast resolution?
Spatial resolution and noise are factors of this parameter.
What is image quality?
Godfrey Hounsfield
Who is credited with inventing the CT scanner?
Determines number of shades of gray in an image.
What is the window width?
This generation scanner was only used for coronary studies. It consisted of an elctron beam gun.
What is the 5th generation?
A pixel with the added dimension of depth so that slice thickness is possible.
What is a voxel?
In the first four generations of CT scanner, this component determined slice thickness.
What is pre-patient collimation?
Reference material for CT number calibration
What is water?
Xenon Gas and Scintillation detectors are both used in this generation of scanners.
What is 4th?
Number arrays arranged in a grid format.
What is a Matrix?
Physical principles of the CT image production.
What is Linear attenuation coefficient and hounsfied units?
Being able to distinguish boundaries between structures on a CT image.
What is spatial resolution?
Ct numbers are based on this property of the tisue scanned.
What is the linear attentation coefficient?
This generation scanner was first generation with 360 scanning arc
Third generation
Ths component of CT Amplifies detector signal, Converts analog signal to digital signal
and transmits digital signal to the computer.
What is the DAS?
A plotting graph That depicts the relationship between image fidelity and spatial frequency. It is a demonstration of how much contrast in orginal image is maintained by the detectors.
Modulation Transfer Function. (MTF)
The midpoint of the gray scale range.
What is the window level?
Generation with fixed detector arrays
What is the 4th generation?
The mechanical component that allows continoous scanning which makes helical scanning possible.
What is a slip ring?
Hounsfield number of water.
What is zero?
this type of resolution is determined by Focal spot size, slice thickness and the display field of view (DFOV)
Spatial resolution