Prelim 1 Flashcards
2d imaging used ___
( downside)
xrays
Superimposition of structures
Greek word: ___ means slice ___ means write
tomos
graphy
COMPUTED TOMOGRAPHY-Is the process of generating a two-dimensionaL Image of a slice or section through a 3-dimensional object (a ___ )›
tomogram
The first commercially CT scanner was invented by ___ in Hayes ,United Kingdom, at EMI Central Research Laboratories using X-rays
Sir Godfrey Hounsfield
The first EMI-Scanner was installed in ___ in Wimbledon, England
Atkinson Morley Hospital
The first patient brain-scan was done on ___. Emi scanner is limited to scanning only .
1 October 1971
brain
Hounsfield and Cormack got the 1979 Nobel Prize for their contributions to CT. ______
Medicine and physiology
PARTS OF CT SCAN MACHINe
Gantry( scanner system)
- Patient’s table
- Computer ( operation control)
SCANNER SYSTEM
1-4
X-RAY TUBE
2. Detector system
3. Collimators
4. Filters
: generates xray beams
: detects the xrays passing thru the px body
: narrows the beams of xrays
: used to filter some rays from entering the px body that may be harmful
X-RAY TUBE
DETECTOR
COLLIMATOR
FILTERS
2 types of scanner system
Conventional
Spiral scan
- scan taken slice by slice and after slice the scan stops.
Ex.: from top of abdomen till the pelvis. This needs the px to hold their breath.
CONVENTIONAL
” absorbs the penetrated X-rays, measures the X-ray amount, and transmits the data to a computer system
detector array
: continous scan taken in spiral fashion . It is quick.
SPIRAL SCAN
◦ Ct number measured in
Hounsfield unit.
