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