Abstract: An anti-scatter device for suppressing scattered radiation includes a plurality of x-ray absorbing layers. The anti-scatter device further includes a plurality of spacer layers, such that each spacer layer is arranged between any two of the plurality of x-ray absorbing layers in order to hold each of the x-ray absorbing layers in a pre-defined orientation. Furthermore, each of the spacer layers includes a plurality of unsealed voids to reduce the absorption of x-rays incident on at least a portion of each of the spacer layers.

Abstract: An anti-scatter device for suppressing scattered radiation is disclosed. The anti-scatter device comprises a plurality of x-ray absorbing layers. The anti-scatter device further comprises a plurality of spacer layers, such that each spacer layer is arranged between any two of the plurality of x-ray absorbing layers in order to hold each of the plurality of x-ray absorbing layers in a pre-defined orientation. Furthermore, each of the plurality of spacer layers comprises a plurality of unsealed voids to reduce the absorption of x-rays incident on at least a portion on each of the spacer layers.

Abstract: A zero crossing detector which compensates input offset voltage by switching connections between certain capacitors. A first capacitor connected in parallel with the comparator input, is charged to this offset value during one switching step. Part of this charge is transferred to an input series-connected capacitor during a next switching step. These steps are repeated at a high switching rate. Preferably, a voltage step source is applied to the first capacitor in that next step, and functions as a threshold during the comparison function. Once the threshold has been exceeded, the voltage step source is reversed.