The present invention relates to a detection device for detecting radiation emitted from a radiation source, wherein the detection device (6) comprises a detection surface (19) and lamellae (18) protruding from the detection surface (19), wherein the lamellae (18) comprise a first end portion (20) close to the detection surface (19) and a second end portion (21) remote from the detection surface (19) and wherein the first end portion (20) has a larger width than the second end portion (21). The invention relates further to a computed tomography apparatus comprising this detection device.
