Phantoms Artificial

Crick lists the references Ramachandran, V.S., "Blind Spots" Scientific American 266 86-91 "Perceptual Filling in of Artificially induced Scotomas in Human vision" Nature 350 699-702 and "Filling in Gaps in Perception Part 2, Scotomas and Phantom Limbs" Current Directions in... 

Phantom. A volume of material artificially made to simulate the property of an organ or part of the body when exposed to radiation. 

To test the algorithm, both an artificial and cadaverous phantom were created. Each phantom was scanned using a multirow detector CT (GE Light-speed QXl, GE Medical Systems). A collimation of 2.5 mm and ahigh quality pitch were selected. Scans were reconstructed using the manufacturer s stan-... 

An artificial phantom was created by putting small plasticine beads into a plastic tube. In that way, six polyps were created. A photograph of one of the ends of the tube is shown in Figure 18.5. 

The artificial phantom contains six simulated polyps placed in the two ends of the plastic tube. The result after segmentation with its central path is shown in Figure 18.7a. Figure 18.7b depicts the computed virtual dissection using the 2D flattening approach. 

The two polyps can be clearly seen. The other parts of the phantom is presented in a similar way. The Fjg. The other end ofthe artificial phantom, a Trans-... 

In the case of cadaverous phantoms, a total of 13 artificial polyps were created using fat tissues. Figure 18.9a exhibits the surface-rendered 3D reconstruction of the segmented colon, and Figure 18.9b presents the same binary object with its central path as a transparent 3D model. In Figure 18.10 the appearance of the created polyps on axial and virtual endoscopic views can be seen. 

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