Patent ID: 9538979
Date: 2017-01-10
CPC Classifications: A61B,H01J,H05G

Claim:
1. An X-ray tube housing assembly operable to provide a signal, the X-ray tube housing assembly comprising: an X-ray tube generating X-radiation from a focal spot; a reference filter; and a reference detector; and a controller; wherein the X-radiation comprises a main portion, and a reference portion, wherein the main portion is distinct from the reference portion; wherein the main portion and the reference portion are between a minimum (α min,MAIN , (α min,REF ) and a maximum (α max,MAIN , α max,REF ) take-off angle, being angles of elevation from a vertex at the focal spot ( 104 ), subtended by a base plane; wherein the minimum take-off angles of the reference portion and the main portion (α min,REF , α min,MAIN ) are equal to each other, and the maximum take-off angles of the reference portion and the main portion are equal to each other (α max,REF , α max,MAIN ); wherein the reference filter is configured to filter the reference portion before detection of the reference portion by the reference detector; wherein the reference detector is configured to detect the reference portion to provide a reference signal; and wherein the controller is configured to calculate a signal, based on the reference signal.