Apparatus responsive to movement of a patient during...

A - Human Necessities – 61 – B

Patent

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A61B 6/08 (2006.01) A61N 5/10 (2006.01)

Patent

CA 2266075

A camera (35) generates digital image signals representing an image of one or more natural or artificial fiducials (39) on a patient positioned on treatment or diagnosis equipment. A processor applies multiple levels of filtering at multiple levels of resolution to repetitively determine successive fiducial positions. A warning signal is generated if movement exceeds certain limits but is still acceptable for treatment. Unacceptable displacement results in termination of the treatment beam (15). Tracking templates can be generated interactively from a display of the digital image signals or through automatic selection of an image having the median correlation to an initial template. A gating signal synchronized to patient breathing can be extracted from the digital image signals for controlling the radiation beam generator.

Une caméra (35) génère des signaux image numériques représentant une image d'un ou plusieurs repères naturels ou artificiels (39) sur un patient placé sur un appareil de traitement ou de diagnostic. Un processeur applique de multiples niveaux de filtrage à de multiples niveaux de résolution, de façon à déterminer itérativement les positions de repérage successives. Un signal d'alarme est généré si les mouvements dépassent certaines limites tout en restant acceptables pour le traitement. Des mouvements inacceptables arrêtent le rayonnement thérapeutique (15). Des modèles de poursuite peuvent être générés interactivement à partir de l'affichage des signaux image numériques ou par sélection automatique d'une image ayant la corrélation médiane par rapport à un modèle initial. Un signal de validation synchronisé avec la respiration du patient peut être extrait des signaux image numériques afin de commander le générateur de faisceaux de rayons.

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