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The Computer Tomography process
Acquisition
The sample is rotated through 360 degrees on a precision turntable
and a set of High resolution digital radiographs are acquired at
regular (typically 0.5 degree) increments. The accuracy of this
data set determines the ultimate quality of the final 3D data.
Correction
Each projected image from the data set undergoes Geometric and shading
correction, to remove spatial and intensity non-linearities introduced
by the imaging device.
Reconstruction
By combining all of the individually corrected images and using
a Cone Beam Back Projection technique, a geometrically correct,
three dimensional data cloud is computed. The patented software
has a real-time viewer that shows the reconstruction progressing
in parallel with the x-ray images being captured.
Viewing Results
The CT data collection, reconstruction and display are presented
to the operator via the X-Tek Graphical User Interface (XGUI). This
has been developed to provide ease of use with the highest performance
for systems to fit users budgets without compromise. The data cloud
can be sliced open in any direction to reveal internal detail, surface
rendering software similar to that used in 3D CAD systems is used
to visualise the exposed features.
Wide variety of post processing
The data cloud can be output as a stereo lithography file, a format
accepted by most CAD packages. Once imported into a CAD system the
radiographic information can be compared directly with the original
design file to highlight differences when checking first off manufactured
parts, or if the original design is not available, then the radiographic
data is used to create a new CAD file for rapid prototyping and
reverse engineering.
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