Radiology device with helically arranged sources and detector
A radiology device includes a support capable of translational movement about an axis of translation relative to a frame of the device, the support being intended to support an object that is to be imaged, an ionizing-ray generator and a detector configured to detect the rays emitted by the generator, the generator and the detector facing one another. The generator comprises several sources each considered to emit from a focal point, the focal points of the various sources being distributed along a sources axis, the detector extending along a detector axis, the sources axis and the detector axis extending in the form of mutually intertwined helices about the axis of translation.
1. A radiology device comprising a support capable of translational movement about an axis of translation relative to a frame of the device, the support being intended to support an object that is to be imaged, an ionizing-ray generator and a detector configured to detect the rays emitted by the generator, the generator and the detector facing one another, wherein the generator comprises several sources each considered to emit from a focal point, the focal points of the various sources being distributed along a sources axis, in that the detector extends along a detector axis, in that the sources axis and the detector axis extend in the form of mutually intertwined helices about the axis of translation, in that each of the sources emits a substantially flat and fan-shaped beam of ionizing rays, in that the device further comprises a collimator having, facing each source, a slot configured to obtain the fan-shaped beam and produced in a plane of the collimator that is parallel to the axis of translation, in that the collimator extends mainly along a collimator axis parallel to the sources axis, in that the slots are not secant and in that the slots each extend mainly along a curve portion defined in the plane of the collimator and in that the projections, perpendicular to the collimator axis, of curve portions, corresponding to consecutive slots, onto the collimator axis, have a part in common.
2. The radiology device as claimed in claim 1 , wherein the generator and the detector are fixed relative to the frame.
3. The radiology device as claimed in claim 1 , wherein the helical shapes are positioned relative to one another in such a way that, for each of the sources, a beam of ionizing rays emanating from the source concerned and reaching a portion of the detector is situated substantially in a plane perpendicular to the axis of translation.
4. The radiology device as claimed in claim 3 , wherein the curve portions follow a substantially sinusoidal shape.
5. The radiology device as claimed in claim 4 , wherein each curve portion comprises at least one straight portion approximating the sinusoidal shape.
6. The radiology device as claimed in claim 1 , wherein the curve portions of the various slots extend parallel to one another.
7. The radiology device as claimed in claim 1 , wherein the detector is positioned partly between the generator and the axis of translation in a plane perpendicular to the axis of translation while leaving a free space for the passage of the rays emitted by the generator toward the detector.
8. The radiology device as claimed in claim 1 , wherein the helical shape of the sources axis and the helical shape of the detector axis are each based on a smooth curve centered on the axis of translation.
9. The radiology device as claimed in claim 8 , wherein the smooth curves are each formed on a cylindrical surface with the cross section of a circle of which the axis is the axis of translation.
10. The radiology device as claimed in claim 8 , wherein the smooth curves are each formed on a cylindrical surface with the cross section of a regular polygon of which the axis is the axis of translation.
11. The radiology device as claimed in claim 1 , wherein each source comprises a cold cathode emitting an electron beam through the field emission technique.