Katia Sourbelle
The aim of this phantom is to provide semi–anthropomorphic cone–beam rawdata for CT-examinations of the thorax.
Phantom Description
The Phantom should represent the important parts of the thorax which are usually visualised during the CT examination : lungs, heart, aorta, ribs, spine, sternum, and shoulders.
Thorax:
The lungs are represented by two ellipsoids and the heart by a sphere. The aorta consists of three joined cylinders (2 vertical and 1 horizontal), to represent its ascending and descending parts.
The ribs will be modelled by nine small joined cylinders (Fig 1.b). In order to define the cylinders, we will say that their center lies on a tilted ellipse with the co-ordinates {a cos(q ), b sin(q ), c sin(q )}, for q between p /2 and 3p /2 with steps of p /10. The axes of the cylinders are parallel to the tangent of the ellipse at the centers.
We will take 5*2 ribs for the whole thorax.
For the spine we use the model defined for the Cardio-Phantom (Stefan Ulzheimer, IMP) which will be built to evaluate the quality of CT images (Fig 1.c).
The Sternum will be represented by a box.
