Patent Number: 060944749
Section: claims

1. A hyper-transparency compensating device for a gantry mounting radiography apparatus, the apparatus having a first and second opposite arms rotatable around a rotation axis, the first arm supporting an X-ray source and the second arm supporting an X-ray tube amplifier that is in registry with the X-ray source, the apparatus being used for radiographing an organ having a median plane in which the rotation axis is substantially lying, the device comprising: at least one compensating filter defining a filter plane, the compensating filter having a longitudinal rotation axis;  a supporting assembly to pivotally support the compensating filter and allow a rotation thereof around the longitudinal rotation axis, the supporting assembly being connectable to the first arm of the gantry mounting apparatus, in front of the X-ray source and in registry with the X-ray source and the hyper transparency area while keeping the filter plane parallel to the reference plane during rotation of the arms around the axis. 2. A device according to claim 1, wherein the device comprises a three-dimensional scaled replica of human lungs in two parts, each part being in registry with one corresponding human lung. 3. A device according to claim 2, wherein each part of the compensating filter has a volume between 1/2 to 1/3 of the volume of the corresponding human lung. 4. A device according to claim 1, wherein the supporting assembly comprises an axis transparent to X-rays and extending between two opposite supporting arms. 5. A device according to claim 4, wherein the axis is made of a nylon cord. 6. A device according to claim 5, wherein the supporting assembly comprises a plate and connecting means for connecting the plate to the axis. 7. A device according to claim 6, wherein the connecting means comprises hooks. 8. A device according to claim 1, wherein the device comprises two spaced-apart and parallel isometric compensating filters, each in registry with the hyper transparency area around the organ. 9. A device according to claim 8, wherein each compensating filter comprises a bottom section heavier than an upper section thereof. 10. A device according to claim 9, wherein each compensating filter is T-shaped. 11. A device according to claim 10, wherein each compensating filters further comprises at least one side opening to follow a contour of the organ. 12. A device according to claim 11, further comprising at least one peripheral filter set directly over the patient. 13. A device according to claim 9, wherein each compensating filter is star-shaped. 14. A device according to claim 13, wherein each compensating filters further comprises at least one side opening to follow a contour of the organ. 15. A device according to claim 14, further comprising at least one peripheral filter set directly over the patient.