02-10-2010, 12:41 PM
PRINCIPLES OF CT SCAN ABDOMEN.pptx (Size: 1.98 MB / Downloads: 83)
PRINCIPLES OF CT SCAN ABDOMEN
NEHME NIAZI, Eng
history of ct scan
1917-J RADON,WORKING WITH GRAVITATIONAL THEORY
Proved that an image of an unknown object could be produced if one had an infinite number of projections through the object
1956-BRACEWELL WORKING IN RADIOASTRONOMY
1961-OLDENDORF UNDERSTOOD CONCEPT OF CT
1972-G.N.HOUNSFIELD PUT A CT SYSTEM TOGETHER.
CT was originally proposed and used as an extension of the basic X-ray: doctors wanted to see inside the head, but standard X-ray techniques could not penetrate the dense skull while distinguishing soft tissues
The first scanners could only do one slice at a time and each slice took 4 minutes to complete
By 1976, whole body scanners were developed
Today’s machines can acquire a slice in less than half a second (.1 second for the GE top-end multislice LightSpeed Pro16 with Xtream)
Advancements still occurring through new technology