Method and system for controlling x-ray focal spot...

A - Human Necessities – 61 – B

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A61B 6/03 (2006.01) H01J 35/24 (2006.01) H05G 1/52 (2006.01)

Patent

CA 2736592

An x-ray tube is described that includes components for increasing x-ray image clarity in the presence of a moving x-ray source by modifying focal spot characteristics, including focal spot size and focal spot position, tn a first arrangement a static focal spot is moved in a direction contrary to the movement of the x-ray source so that an effective focal spot position is essentially fixed in space relative to one of the imaged object and/or detector during a tomosynthesis exposure. In a second arrangement, the size of the static focal spot is increased, and the resulting increase in tube current reduces the exposure time and concomitant blur effect. The methods may be used alone or in combination; for example an x-ray tube with a larger, moveable static focal spot will result in a system that fully utilizes the x-ray tube generator, provides a high quality image with reduced blur and, due to the decrease in exposure time, may scan the patient more quickly.

L'invention concerne un tube de rayons X comprenant des composants permettant daugmenter la clarté des images à rayons X en présence dune source de rayons X en mouvement en modifiant les caractéristiques de point focal, y compris la taille du point focal et la position du point focal. Dans une première configuration, on déplace un point focal statique dans une direction contraire au mouvement de la source de rayons X pour que la position effective du point focal soit essentiellement fixe dans l'espace par rapport à lobjet imagé et/ou au détecteur pendant une exposition de tomosynthèse. Dans une seconde configuration, on augmente la taille du point focal statique, et laugmentation résultante de courant tubulaire réduit le temps dexposition et leffet de flou concomitant. Les procédés peuvent sutiliser seuls ou en combinaison ; par exemple un tube à rayons X avec un point focal statique mobile, plus grand, se traduit par un système utilisant à plein le générateur de tube à rayons X, fournit une image haute qualité au flou réduit et,  du fait de la baisse du temps dexposition, peut scanner le patient plus rapidement.

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