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Cone-Beam
CT & COBRA Software |
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Can I run COBRA on my own PC?
COBRA can be installed on every PC running Windows
NT, 2000 or XP. Minimum requirements are Pentium 3
or Athlon CPU's and 256 MB of RAM, as well as
sufficient disk space to store the projections and
the final image (typically 1/2 GB each). |
How long will it take to reconstruct a 3D image?
Image reconstruction time depends on a
number of factors: processor speed,
processor-memory bandwidth, hard disk speed; it
scales with the number of incoming projections,
and roughly with the number of voxels in the
output volume. Options to enhance image quality
will add further computation. As a rule thumb, one
can take the following benchmark number: a dual
2.6 GHz P4 computer will reach 5 fps (incoming) of
512x512 when reconstructing a 512-cube output
file. |
Is COBRA for re-sellers or end users?
COBRA licenses are available for both
categories. COBRA is available as stand-alone application, which may be used in off-line
mode (accessing raw data from a file), or in-line
(using a communication library). Resellers can
integrate COBRA as dll into their scanner software
and write their own GUI. |
What support do I get from Exxim?
In addition to the User's Guide and the
Programmer's Manual, Exxim engineering will work with end users and OEM
engineers to make integration simple and straight forward. Exxim
provides dedicated maintenance services and upgrades. |
Can we update Cobra to new version and is it free?
Any Cobra update to a newer version is free in general.
It means that all existing and purchased functionality is supported and free to update in upcoming versions.
In the same time when Cobra comes in a new generation it usually gets a major new functionality.
For example it was SDK for Cobra 2 (versus Cobra 1), cluster solutions (Cobra 3 versus Cobra 2),
SAMARA (Cobra 4 versus Cobra 3), etc. The latest big update is an advanced visualization including volume rendering
in Cobra7. Some of those big changes are reflected in our price list as options that have to be bought for extra money. Particularly they are: SDK, cluster solutions, graphics acceleration support , and advanced visualization
(available only as an Alfa at the moment). So whatever functionality you bought it is supported and free to update.
If some options were not purchased then they are not available for free in updates
(you always can pay an exact price difference and have them).
The setup package is totally the same for all available Cobra configurations
(we invite you to visit our web site for the latest and greatest versions and fixes).
We control a user access to options through a programmed (on our side) HASP USB key. |
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What about Feldkamp artifacts?
Feldkamp's
algorithm, which filters the projections along
rows perpendicular to the axis of rotation, is not
exact outside the equatorial plane. If the object
is not homogeneous along the axis, visible
artifacts will occur at cone angles larger than
about 10 degrees.
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What about image quality?
Image quality comprises many aspects, most of
which resemble 2-dimensional CT:
(1) geometric
fidelity: excellent.
(2) high
contrast spatial resolution: typically better than
achievable with 2D CT as flat panel detectors have
smaller pixels.
(3) low
contrast density resolution: COBRA works with 32
bits, results are available at 16 bits. Low
contrast resolution depends on photonic noise
(dose) and the amount of artifacts (most
important: streaks from under-sampling, lack of
geometric scanner control, metal artifacts; rings
caused by bad pixels in the detector; swirls
caused by misalignment; light and dark bands and
cupping caused by beam hardening and scatter). At
the present stage, cone beam CT has not reached
the same image quality as 2D CT, but rapid
progress is being made to improve it.
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How to upload a dataset to the Exxim's FTP site?
Our ftp (available for uploading by exxim's customers) is:
URL: www.exxim-cc.com
Login: customer-up@exxim-cc.com
Psw: Please contact Exxim at sgouzeev@exxim-cc.com
Please note:
1) This is ftp protocol, so this is not about our web site www.exxim-cc.com.
You should use any FTP client program, for example, SmartFTP (www.smartFTP.com).
2) We recommend compressing data before uploading (see e.g. www.rarlab.com).
Both programs are free for a reasonable trial period.
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How can I buy COBRA?
Please contact sales@exxim-cc.com
or call Exxim at (925)416-1900.
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I
have more questions about COBRA
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