Grapefruit USA Inc (GPFT)

[goldcoastoh]

mr. sano, i want to first say thank you for asking this question... in order to best answer i thought it best to look again at the dominion footage...

http://imaging3.com/video_imaging3dominion.html

now, if i hadn't have done this i would be amiss, in my answer to you...

as my post on cone-beam CT states (as i posted over the weekend)...

i mentioned that (at least while reading the cone-beam physics tutorial article i mentioned, which is the last link which i included again here below)... that flat panel detector technology is the way to go...for cone-beam CT (CBCT) and i believe conventional CT machines may be attempting to go that way... (this latter comment i made based on the radiology article which goes along with the 4th generation picture from my post over the weekend)... it was sorta difficult to understand if they were implying that flat panel detectors are going to be used in conventional CTs or not... but they did seemed to imply an advantage for such...HOWEVER, FLAT PANELS ARE ABSOLUTELY NECESSARY FOR CONE-BEAM CT's because of beam geometries.

now, all this to say that:

again, for CBCT flat panel detectors are used... i just watched the dominion footage per link above... i had previously thought that this footage had the gantry components spinning at working speed and thus it was difficult to ascertain componentry to show the insides. however, this is not the case, and actually dean is pointing to the flat panel detector in the DViS during the clip....

now, comes specificity: he calls the detector a CCD detector... which is technically what it is...

you'll note that his bio states, "He was responsible for integrating a CCD camera with a mobile fluoroscopy into the C-arm, a system that is used throughout the medical diagnostic medical imaging industry today."

http://imaging3.com/management.html

NOW MORE THAN THIS ABOVE: READ THIS BELOW:

In early 1994, Imaging3 began offering upgrades for OEC C-arms. The most successful upgrade was a CCD (Charged Coupled Device) camera, which improved image quality of older systems comparable with that of brand new products. ***This offering became so successful that the Company integrated this upgrade with used OEC C-arms and built custom units for NASA, Harvard, University of California at Irvine, University of California at Davis, Baylor University, Baxter Healthcare and other prestigious healthcare organizations. Later that year, Imaging3 applied for and received United States Food and Drug Administration ("FDA") approval for this device described as the NASA II CCD C-arm.***

http://msnmoney.brand.edgar-online.com/DisplayFilingInfo.aspx?TabIndex=2&FilingID=6508150&companyid=385706&ppu=%252fDefault.aspx%253fticker%253dimgg

Thus...

this is why i've stated that dean is the rarest of the biomedical engineers...

the entrepreneurial (the rarest), but is his a fine combination of the two types: the researcher and the clinical...


*****

okay now, to get to the rest of your question...

the cone-beam CT uses a CONE-BEAM it is an x-ray beam sent out having CONIC geometries...

typical/conventional CT use a FAN-BEAM...think what a chinese fan looks like... look again at Figure 2 to compare the two beam types...

http://www.ajnr.org/cgi/reprint/30/6/1088?maxtoshow=&HITS=60&hits=60&RESULTFORMAT=&fulltext=three+dimensional+fluoroscopy&andorexactfulltext=and&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT


*****

And finally, to get back to your question... thus, the DViS is more or less a 3rd generation CT gantry... albeit using a CCD detector... all other detectors for conventional 3rd generation CTs do not use a flat panel at this time. the detector is specific piece of equipment and is concave to form snuggly inside the gantry curvature... HOWEVER, AGAIN I'M NOT SURE IF MANUFACTURERS ARE ATTEMPTING TO GO THE FLAT PANEL ROUTE FOR THEIR CONVENTIONAL CT's (per that radiology article)...

a 4th generation gantry will have the detectors "embedded" in the actual gantry inside... only the x-ray source does the spinning... the beam hits the inside curvature (embedded detectors) of the gantry... THIS IS THE TYPE WHICH HASN'T REALLY CAUGHT ON... more or less, a "failed" generation...


*****

actually, i should've known all this b4 now, and sonomawest... this post is actually for you too, as you had asked something sorta similar before about detectors, photography, and radiography, etc.