Re: PCI Frame Grabbers
- From: David Clunie <dclunie@xxxxxxxxxxx>
- Date: Fri, 23 May 2008 05:00:20 -0700 (PDT)
On May 22, 12:53 am, Dustcane <msabs...@xxxxxxxxx> wrote:
just wanna know as to why images captured from PCI frame grabbers are
not suitable for diagnosis and they do not have any medical value; in
that sense the images captured from PCI Frame Grabber and wrapped with
DICOM headers would also be rendered "not useful for diagnosis".
In general no, in my opinion as a radiologist, video frame-grabbed
images are undesirable for most
medical purposes, and significantly degraded by comparison with the
digital original images, which should be used by preference. It all
depends on the source of the original data, the bit depth, whether the
displayed images have been windowed (e.g., from 12 bits to 8), their
original and displayed resolution, the presence of burned in
annotation in the video signal, etc. Video frame grabbing, like
scanning a sheet of printed CT film, is a desperate last resort in
these situations. For visible light sources, like a microscope or
endoscope, a digital camera will give better results than a digitized
video signal. The era of frame grabbing from devices that have no
digital interface or a proprietary digital interface has largely
passed into history, except for essentially obsolete devices.
Having said that, there are still sites with such obsolete devices, or
applications for which the source video quality is not terribly high
in the first place, and there is still a market for frame grabbing
systems. See for example products like TIMS (http://www.tims.com/).
David
.
- References:
- PCI Frame Grabbers
- From: Dustcane
- PCI Frame Grabbers
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