Components
Two components located within the gantry
x-ray tube and detectors
The plane that CT images are acquired in
transverse or axial
MSCT utilizes many of these to acquire several slices in one rotation.
detector rows
This is created when solid-state detectors are placed together too closely.
crosstalk
Inventors of CT
Hounsfield & Cormack
The energy that modern CT scanners operate at
120 kVp
The relationship between the table movement during one 360 degree tube rotation and the beam width.
pitch
This is how MSCT units are rated
the number of detector rows
Layer in a solid-state detector that converts the electric signal into electrons.
TFT
How well the detectors receive photons
Capture efficiency
Three necessary features of a CT couch
2. very little attenuation of the beam
3. provides longitudinal support
Inverse - when a pitch of less than 1 is used the dose is higher to the patient and vice versa
Three advantages of MSCT over single slice CT
faster, less dose to patient, post-acquisition reconstruction, increased resolution due to decreased section thickness,
Three requirements for CT detectors
respond quickly, discard the signal quickly, high stability, wide dynamic range.
Places of collimation in CT
Pre-patient at the tube where the beam exits and Post-patient - lead shields immediately in front of detectors and septal collimators between detectors