(left) CT image of the brain, (cent) subset of CT images, (right) the Shepp-Logan phantom [taken from "Applied Biomedical Engineering" Ch. 19]
The Applied Maths department has designed and built several computed tomography (CT) systems that image at the micron scale, i.e., a micro-CT facility. The group has also purchased a 3D printer. The idea here is to design and 3D print some phantoms to be imaged at the facility.
"Phantoms" are objects used for performance testing and/or calibration of 3D X-ray computed tomography (CT) systems. There are several standard calibration phantoms used for medical CT, however, there seem to be no universally used standards for micro-CT. The first part of this project involves the design of a phantom that could serve for calibration of micro-CT.
Typically the 3D colour printer prints on a kind of plaster; a printed object would appear as a black/white object in X-ray tomography. By modifying the inks used we should be able to get varying degrees of X-ray attenuation throughout the plaster and effectively see "greyscale" printing in the X-ray images. The second part of the project involves testing/proving this concept.
Thirdly, if we can have "greyscale" printing: we can start investigate the printing of "ghost" objects. Ghosts are objects that essentially disappear at certain projection angles. This part of the project would be done incollaboration with Dr. Imants Svalbe from Monash Uni. (An expert on ghost functions).