Device for adjustment of the anti-scattering grid to the focal length for radiological equipment

1. Device for an adjustment of an anti-scattering grid (G) of a radiological equipment to different focal lengths (f 1 f 2 ) that said equipment can provide, characterized in that it includes a first pressing member (P) located at a first end of the device and a second identical pressing member (P) located at an opposite end of the device, both said pressing members (P) being mobile in the direction transverse with respect to the plane of the grid (G), which is arranged and restrained between said pressing members (P) and a pair of identical corresponding underlying contrast members (C) located respectively under said first and second pressing members (P), and in that each pair of pressing members (P) and contrast members (C) has a convex/concave profile corresponding to the locus of the local deformations (d, d′, . . . ), calculated point by point with a suitable spatial resolution, necessary to adjust the orientation of the segments of the grid (G) when adjusting the grid (G) to go from a first focal length (f 1 ) taken as a reference to a second focal length (f 2 ).

2. Device according to claim 1 , characterized in that the reference focal length (f 1 ) is longer than the second focal length (f 2 ) and the pressing (P) and contrast (C) members respectively have a convex profile and a concave profile.

3. Device according to claim 1 or 2 , characterized in that the concave profile member is adapted to secure the grid (G) by introducing the grid (C) into lateral end guides, and in that the convex profile member is adapted to secure the grid (G) by means of a central plate (L) which enters a corresponding recess (K) formed on said concave member.

4. Device according to claim 3 , characterized in that return springs (U) are arranged between the pressing member (P) and the contrast member (C).

5. Device according to claim 3 , characterized in that the driving of the device is achieved by means of cables (F), one for each pair of members (P, C), passing over pulleys (E, E′) suitable to transmit a pressing action to the pressing members (P), the pull on said cables (F) being exerted by a motorized drum provided with end stops both in the device closing and opening direction.

6. Device according to claim 3 , characterized in that the contrast members (C) are connected by crossbars; and the grid (G), the pressing members (P) and the contrast members (C) connected by said crossbars form a removable frame introduced into a fixed structure and blocked therein by a retention system.

7. Device according to claim 6 , characterized in that the retention system of the removable frame consists of retaining clips (R) carrying blocking teeth (B), the position of the frame in abutment on said teeth (B) being guaranteed by biasing springs (M) also suitable to make easier the removal of the frame when said clips (R) are widened to disengage it.

8. Device according to claim 1 or 2 , characterized in that return springs (U) are arranged between the pressing member (P) and the contrast member (C).

9. Device according to claim 8 , characterized in that the driving of the device is achieved by means of cables (F), one for each pair of members (P, C), passing over pulleys (E, E′) suitable to transmit a pressing action to the pressing members (P), the pull on said cables (F) being exerted by a motorized drum provided with end stops both in the device closing and opening direction.

10. Device according to claim 8 , characterized in that the contrast members (C) are connected by crossbars and of the grid (C), the pressing members (P) and the contrast members (C) connected by said crossbars form a removable frame introduced into a fixed structure and blocked therein by a retention system.

11. Device according to claim 10 , characterized in that the retention system of the removable frame consists of retaining clips (R) carrying blocking teeth (B), the position of the frame in abutment on said teeth (B) being guaranteed by biasing splings (M) also suitable to make easier the removal of the frame when said clips (R) are widened to disengage it.

12. Device according to claim 1 or 2 , characterized in that the driving of the device is achieved by means of cables (F), one for each pair of members (P, C), passing over pulleys (E, E′) suitable to transmit a pressing action to the pressing members (P), the pull on said cables (F) being exerted by a motorized drum provided with end stops both in the device closing and opening direction.

13. Device according to claim 5 , characterized in that the contrast members (C) are connected by crossbars and the grid (G), the pressing members (P) and the contrast members (C) connected by said crossbars form a removable frame introduced into a fixed structure and blocked therein by a retention system.

14. Device according to claim 13 , characterized in that the retention system of the removable frame consists of retaining clips (R) carrying blocking teeth (B), the position of the frame in abutment on said teeth (B) being guaranteed by biasing springs (M) also suitable to make easier the removal of the frame when said clips (R) are widened to disengage it.

15. Device according to claim 1 or 2 , characterized in that the contrast members (C) are connected by crossbars (X); and of the grid (G), the pressing members (P) and the contrast members (C) connected by said crossbars (X) form a removable frame introduced into a fixed structure and blocked therein by a retention system.

16. Device according to claim 15 , characterized in that the retention system of the removable frame consists of retaining clips (R) carrying blocking teeth (B), the position of the frame in abutment on said teeth (B) being guaranteed by biasing springs (M) also suitable to make easier the removal of the frame when said clips (R) are widened to disengage it.

17. Device according to claim 16 , characterized in that it further includes a sensor (S) suitable to detect the presence of the grid (G).

18. Device according to claim 15 , characterized in that it further includes a sensor (S) suitable to detect the presence of the grid (G).

19. Radiological equipment providing different focal lengths (f 1 , f 2 ), characterized in that it includes a device for an adjustment of the anti-scattering grid (G) according to claim 1 .