CT scanner Generations
what is a detector array?
multiple detectors
Ring artifacts are characteristics of which scanner?
3rd generation
which generations are ideal for heart imaging?
5th and 6th gen
what are terms used to refer to high-speed scanners?
-electron beam -cardiovascular -cine -ultrafast CT
what is the advantage and disadvantage of 7th generation scanners?
-excellent spatial resolution -lacks good contrast resolution
What is a ring artifact? and which generation is apt to demonstrate this artifact?
-when a single detector malfunctions, the result is a "ring" on the reconstructed image -3rd gen
what generation utilize pencil beam geometry?
1st generation
what generation uses fan beam geometry?
2nd, 3rd, and 4th generation
what type of motion does 4th generation CT scanners have?
Rotate only
what is the process of x-ray production in the 5th generation scanners?
an electron beam that generates 130kV
What does the term CT "generations" mean?
changes to the tube and detector motion as well as the geometry of data acquisition
What acts like a radiographic grid to control scatter?
pre-detector
What determines the slice thickness and decreases patient dose?
pre-patient collimator
What type of motion does 3rd generation CT scanners have?
rotate-rotate motion
what is nutation?
the tilting action of the detector array as the tube is passing.
What type of motion does 1st generation CT scanners have?
translate-rotate motion
What type of motion does 2nd generation CT scanners have?
translate-rotate motion
