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.

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.

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.

How can I buy COBRA?

Please contact sales@exxim-cc.com or call Exxim at (925)416-1900.

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