US 10,376,228 B2
X-ray detection device
Lars Herrnsdorf, Lindome (SE)
Assigned to RTI Group AB, Moelndal (SE)
Filed by RTI Group AB, Moelndal (SE)
Filed on Dec. 18, 2017, as Appl. No. 15/845,618.
Prior Publication US 2019/0183441 A1, Jun. 20, 2019
Int. Cl. A61B 6/00 (2006.01); G21K 1/10 (2006.01); A61B 6/03 (2006.01)
CPC A61B 6/4208 (2013.01) [A61B 6/032 (2013.01); A61B 6/4085 (2013.01); G21K 1/10 (2013.01)] 37 Claims
OG exemplary drawing
 
1. X-ray detection device, comprising:
an X-ray sensing member, and
an X-ray energy filter comprising an attenuation member configured to attenuate low-energy X-rays to a greater extent than high-energy X-rays in a beam or field of X-radiation directed towards the X-ray sensing member,
wherein:
the attenuation member is arranged to extend in a spatial manner at least partly around the X-ray sensing member so as to subtend at least a working solid angle in relation to the X-ray sensing member,
the attenuation member, at least over a working area corresponding to the working solid angle, is provided with a plurality of low-attenuation zones distributed over the working area of the attenuation member, wherein the low-attenuation zones are configured to attenuate X-rays only to a small or negligible extent so as to allow passage of both low-energy and high-energy X-rays to a substantially similar extent through the attenuation member towards the X-ray sensing member,
the low-attenuation zones are distributed in relation to the X-ray sensing member in such a way that, when the X-ray detection device is exposed to a beam or field of parallel X-radiation that is directed towards the X-ray sensing member within the working solid angle and that has a width that covers a projected area of the energy filter, only a first portion of a total surface of the X-ray sensing member facing the beam or field of X-radiation is directly exposed to low-attenuated X-rays that pass through the low-attenuation zones, whereas a second remaining portion of the total surface of the X-ray sensing member facing the beam or field of X-radiation is directly exposed only to X-rays that pass through the attenuation member, and
the relation between i) the first portion of the total surface of the X-ray sensing member facing the beam or field of X-radiation and ii) said total surface of the X-ray sensing member facing the beam or field of X-radiation, is substantially constant irrespective of a spatial angle of incidence of the beam or field of X-radiation that falls within the working solid angle.