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Computed Tomography (or CT) is the process of imaging an object from many different directions using penetrating radiation (e.g. X-rays) and using a computer to calculate the interior structure of that object from these projected images.
Computed Tomography allows the complete structure of an object to be stored and examined to give all internal dimensions and the precise size, shape and location of any internal feature or defect.
Many industries make use of CT including electronics, aviation, advanced materials research, casting and other manufacturing.
The Computer Tomography process
AcquisitionThe 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 processingThe 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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