IMAGING SYSTEM DESIGN Flashcards
3 MAJOR COMPONENTS
1.) Gantry
2.) Operating Console
3.) Computer
Largest component
GANTRY
Subsystems:
x-ray tube, detector array, high
voltage generator, patient couch and
mechanical support
X-RAY TUBE
Special requirements:
o Power capacity: must be high
___ kVp
___ mA
> 120
400
X-RAY TUBE
Special requirements:
High speed rotors: for
heat
dissipation
X-RAY TUBE
Anode heat capacity: __MHU
(Spiral CT)
7 MHU
X-RAY TUBE
Heat storage capacity: _- MHU
8
X-RAY TUBE
Anode cooling rates: __MHU/min
1
X-RAY TUBE
Focal spot size:
Focal spot design: must be
robust or strong
Heat dissipation
small
X-ray tube life: approx.___
exposures (Conventional CT)
5000
CT scanners
designed for____ imaging not for
direct projection imaging
high spatial
resolution
o Design to predict the focal spot
thermal state
o To adjust the mA setting accordingly
Focal-Spot Cooling Algorithms:
o The entire collection of detectors
o Group of detectors
o The image receptor in CT
DETECTORY ARRAY
absorbs radiation and converts it
to electrical signal
Detector:
The ability of the detector to
capture transmitted photons and change them to electronic
signals
High detector efficiency