PROVIDING FEEDBACK ON A TREATMENT OPERATION PERFORMED ON A BODY PART OF A SUBJECT

According to an aspect, there is provided an apparatus for use with a treatment device for providing feedback to a user on a treatment operation performed on a body part of a subject, wherein the treatment device is configured to apply light pulses to skin of the body part to perform the treatment operation, wherein a light pulse applied to the skin treats an area of the skin. The apparatus comprises a processing unit configured to receive a first measurement signal from a first sensor, the first measurement signal comprising information about positions and/or movements of the treatment device over time; for a light pulse previously applied by the treatment device to the body part during the treatment operation, process the first measurement signal to estimate a previous treatment position as a position of the treatment device relative to the body part when the light pulse was generated; for the previously applied light pulse and based on the estimated previous treatment position, estimate a previous treatment area for the light pulse corresponding to the area of skin of the body part that the light pulse was applied to when the treatment device was at the previous treatment position; process the first measurement signal to estimate a current position of the treatment device relative to the body part; based on the estimated current position of the treatment device, estimate a current treatment area corresponding to an area of skin that the treatment device would apply a light pulse to while in the current position; and generate a feedback control signal for a feedback unit, wherein the feedback control signal is configured to cause the feedback unit to generate feedback indicating whether the current treatment area corresponds, or substantially corresponds, to a previous treatment area. Selon un aspect, l'invention concerne un appareil destiné à être utilisé avec un dispositif de traitement pour fournir une rétroaction à un utilisateur concernant une exécution de traitement sur une partie corporelle d'un sujet, le dispositif de traitement étant conçu pour appliquer des impulsions de lumière à la peau de la partie corporelle afin d'exécuter le traitement, une impulsion de lumière appliquée à la peau traitant une zone de la peau. L'appareil comprend une unité de traitement conçue pour recevoir un premier signal de mesure provenant d'un premier capteur, le premier signal de mesure comprenant des informations concernant des positions et/ou des mouvements du di