Variable collimator for spatially segmented radiotherapy
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- AARHUS UNIV
- Filing Date
- 2024-06-20
- Publication Date
- 2026-06-25
Smart Images
Figure 2026520888000001_ABST
Abstract
Claims
1. A variable slit collimator for radiotherapy systems such as spatial segmentation radiotherapy systems, A plurality of collimator leaf pairs, each collimator leaf pair comprising two tapered collimator leaves that abut each other to form the leaf of the variable slit collimator, A leaf adjustment mechanism for adjusting the leaf width of the variable slit collimator by moving the two tapered collimator leaves toward and away from each other in the longitudinal direction of the two tapered collimator leaves, The variable slit collimator comprising the above-mentioned features.
2. The variable slit collimator according to claim 1, wherein the two tapered collimator leaves comprise a lower leaf having a lower base surface and a tapered upper surface, and an upper leaf having an upper base surface and a tapered lower surface.
3. The variable slit collimator according to claim 2, wherein the tapered upper surface of the lower leaf and the tapered lower surface of the upper leaf are in contact with each other.
4. A variable slit collimator according to any one of claims 2 to 3, wherein the lower base surface of the lower leaf and the upper base surface of the upper leaf are parallel.
5. The variable slit collimator according to any one of the prior claims, wherein the leaf adjustment mechanism comprises a first structure connected to or attached to the tapered collimator leaf.
6. The variable slit collimator according to claim 5, wherein the first structure comprises one or more lateral width adjustment bars attached to the tapered collimator leaf, the lateral width adjustment bars can move along the longitudinal direction of the two tapered collimator leaves, and move the two tapered collimator leaves toward and away from each other.
7. A plurality of spacing wedge pairs arranged between the collimator leaf pairs, wherein each spacing wedge pair comprises two tapered wedges that abut each other to form a spacing element, A spacing adjustment mechanism for adjusting the spacing between the pair of collimator leaves of the variable slit collimator by moving the two tapered wedges toward and away from each other, A variable slit collimator according to any one of the prior claims, further comprising:
8. The variable slit collimator according to claim 7, wherein the two tapered wedges comprise a lower wedge having a lower base surface and a tapered upper surface, and an upper wedge having an upper base surface and a tapered lower surface.
9. The variable slit collimator according to claim 8, wherein the lower base surface of the lower wedge and the upper base surface of the upper wedge are oriented toward the collimator leaf pair and in contact with the collimator leaf pair.
10. The variable slit collimator according to any one of claims 7 to 9, wherein the spacing adjustment mechanism comprises a second structure connected to or attached to the tapered wedge.
11. The variable slit collimator according to claim 10, wherein the second structure comprises one or more spacing adjustment traverse bars attached to the tapered wedges, the spacing adjustment traverse bars move along the longitudinal direction of the two tapered wedges, causing the two tapered wedges to move toward and away from each other.
12. A variable slit collimator according to claim 6 or 11, further comprising an upper rail and / or a lower rail, wherein one or more traverse width adjustment bars and / or one or more spacing adjustment traverse bars slide to adjust the leaf width and / or the spacing between the collimator leaf pairs.
13. A variable slit collimator according to claim 12, comprising: a first width adjustment bar connected to all of the lower leaves of the leaf pair; a second width adjustment bar connected to all of the upper leaves of the leaf pair; a first spacing adjustment traverse bar connected to all of the upper or lower wedges of the wedge pair positioned on the first collimator leaf; and a second spacing adjustment traverse bar connected to all of the upper or lower wedges of the wedge pair positioned on either the first collimator leaf or the second collimator leaf.
14. A variable slit collimator for radiotherapy systems such as spatial segmentation radiotherapy systems, Multiple spaced collimator leaves, A plurality of spaced wedge pairs arranged between the plurality of spaced collimator leaves, wherein each spaced wedge pair comprises two tapered wedges that abut each other to form a spaced element, A spacing adjustment mechanism for adjusting the spacing between the collimator leaves of the variable slit collimator by moving the two tapered wedges toward and away from each other, The variable slit collimator comprising the above-mentioned features.
15. A method for controlling a slit collimator in a radiotherapy system such as a spatial segmentation radiotherapy system, A variable slit collimator is provided, comprising: a plurality of pairs of collimator leaves, each having two tapered collimator leaves that abut each other to form a leaf of the variable slit collimator; and a leaf adjustment mechanism for moving the two tapered collimator leaves toward each other and away from each other in the longitudinal direction of the two tapered collimator leaves; A step of using the leaf adjustment mechanism to adjust at least the leaf width of the variable slit collimator by moving the two tapered collimator leaves toward each other and away from each other, The method, including the method described above.