Computed Tomography

[Katy1163]

Does anyone have any extensive information on Computed Tomography? I'm interviewing for an internship at a company that desigs CT systems and I wanted to get an understanding on the subject before the interview. Thanks to anyone who can help!!

 

[uWaveFDL]

http://www.rad.wfubmc.edu/jcat/

Above site is Journal of Computer Assisted Tomography.
They may have some of the info your looking for and further links.
Hope it helps some....

 

[xray]

hey Katy1163;
This information is only based upon my 15 yrs. working in and around CT in addition to my BSEE. As with much of technology faster is better, the first CT's utilized a single xray beam circumventing the area of interest while an ionizing chamber recorded the exiting beam. The area of interest was moved longitudinally in position, to get a different slice of the loaf of bread.
These ionizing chamber readings were converted from analog to digital data and run through varying algorithms to produce an image. The process is much like taking a slice of bread out of a loaf and looking at it. The process was effective, but slow.
Different aspects of body imaging utilizing CT requires much more speed, gather vast amount of data points in shorter amounts of time. The biggest bottleneck of data gathering, I believe, is in the analog to digital conversion. It is also my opinion that some of the cutting edge technology in ADC comes out of the CT design.
Speed was greatly increased somewhere in the late 80's with the helical motion produced by the scanners continuous revolution and the table's continuous longitudinal movement. These datum where run through algorithms that could interpolate the missing data, requirng stronger computing power.
Yet another speed increasing technique is the use of multiple slicing, several xray beams cutting through the arear of interest at the same time upon one revolution of the xray tubes and the ionizing chambers.
A good source of fundamentals and beyond regarding CT technology is a Physicist who has done some writing on the subject, Bushong. Well as you probably have already obtained this intern position I will quit; However, I hope this information finds you and is helpful. Good Luck in this extremely interesting field of EE.

Cy Drollinger

 

[jbartos]

Suggestion: Visit

http://www.gemedicalsystems.com/rad/ct/products/ebt/index.html

http://www.onr.navy.mil/onrasia/oceans/ali12.html

http://www.med.harvard.edu/AANLIB/hms1.html

http://www.reichl-electronics.com/

etc. for more info