System and method for controlling and adjusting interstitial...

A - Human Necessities – 61 – N

Patent

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A61N 5/06 (2006.01)

Patent

CA 2694471

A method and system for controlling and adjusting light in interstitial photodynamic light therapy (IPDT) in a subject is disclosed. More particularly, a method for controlling the light in interstitial tumor photodynamic light therapy is described using a calculation method for determination of status of tissue during the PDT treatment. The status is used in a feedback loop to control the continued PDT treatment. Methods are disclosed that constitute pre-treatment and realtime dosimetry modules for IPDT on the whole prostate glandular tissue. The method includes reconstruction of the target geometry, optimization of source fiber positions within this geometry, monitoring of the light attenuation during the treatment procedure and updating individual fiber irradiation times to take into account any variation in tissue light transmission. A control device that is arranged to restrict delivery of therapeutic light treatment at least temporary in dependence of at least one attribute of one of photodynamic treatment parameters. In comparison to no treatment feedback, a significant undertreatment of the patient as well as damage to healthy organs at risk are avoided.

L'invention concerne un procédé et un système pour commander et régler la lumière en photothérapie dynamique interstitielle (PTDI) chez un sujet. Plus particulièrement, l'invention concerne un procédé pour commander la lumière en photothérapie dynamique de tumeur interstitielle à l'aide d'une méthode de calcul pour la détermination de l'état du tissu pendant le traitement de PTD. L'état est utilisé dans une boucle de rétroaction pour commander le traitement de PTD continu. L'invention concerne des procédés qui constituent des modules de pré-traitement et de dosimétrie en temps réel pour le PTDI sur le tissu glandulaire entier de la prostate. Le procédé comprend la reconstruction de la géométrie cible, l'optimisation des positions de fibre source dans cette géométrie, la surveillance de l'atténuation de la lumière pendant la procédure de traitement et la mise à jour des temps d'irradiation de fibre individuelle pour prendre en compte n'importe quelle variation dans la transmission lumineuse du tissu. L'invention concerne également un dispositif de commande qui est disposé pour restreindre la délivrance du traitement photothérapeutique au moins temporairement en fonction d'au moins un attribut de l'un des paramètres de traitement photodynamique. Par comparaison à une rétroaction de non traitement, un traitement sensiblement insuffisant du patient ainsi qu'un dommage aux organes sains à risque sont ainsi évités.

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