Chapter 27-Computed Tomography
questions with 100% correct answers.
What is conventional tomography? ANS - Results in an image that is parallel to the long axis of the body
What is computed tomography? ANS - produces a transverse image
What is 1st generation CT? ANS - system consists of a finely collimated x-ray beam and has a single
detector, and both move synchronously in a translate-and-rotate fashion
What is 2nd generation CT? ANS - computed tomography imaging systems that are operated in the
translate-and-rotate mode with a multiple detector array intercepting a fan-shaped x-ray beam
What is 3rd generation CT? ANS - tomography imaging systems operate in the rotate-only mode with a
fan x-ray beam and a multiple detector array and revolving concentrically around the patient
Ring artifacts dan occur in... ANS - 3rd generation computed tomography imaging systems
What are 4th generation CT? ANS - Computed tomography imaging systems that operate with a
rotating x-ray source and stationary detectors
Current scanners... ANS - no longer single slice as data is collected as a continuous data stream, patients
hold for a single breath, and entire body can be done in less than a minute
What is interpolation Z axis? ANS - transverse images can be reconstructed at any plane along the z-axis
Interpolation... ANS - Estimates a value between two known values
Extrapolation... ANS - Estimates a value between a value beyond known values
questions with 100% correct answers.
What is conventional tomography? ANS - Results in an image that is parallel to the long axis of the body
What is computed tomography? ANS - produces a transverse image
What is 1st generation CT? ANS - system consists of a finely collimated x-ray beam and has a single
detector, and both move synchronously in a translate-and-rotate fashion
What is 2nd generation CT? ANS - computed tomography imaging systems that are operated in the
translate-and-rotate mode with a multiple detector array intercepting a fan-shaped x-ray beam
What is 3rd generation CT? ANS - tomography imaging systems operate in the rotate-only mode with a
fan x-ray beam and a multiple detector array and revolving concentrically around the patient
Ring artifacts dan occur in... ANS - 3rd generation computed tomography imaging systems
What are 4th generation CT? ANS - Computed tomography imaging systems that operate with a
rotating x-ray source and stationary detectors
Current scanners... ANS - no longer single slice as data is collected as a continuous data stream, patients
hold for a single breath, and entire body can be done in less than a minute
What is interpolation Z axis? ANS - transverse images can be reconstructed at any plane along the z-axis
Interpolation... ANS - Estimates a value between two known values
Extrapolation... ANS - Estimates a value between a value beyond known values
