Résumé
La principale caractéristique de la tomothérapie hélicoïdale est de réaliser des traitements en radiothérapie conformation nelle avec modulation d’intensité sur un mode hélicoïdal gráce au déplacement de la table pendant la rotation de l’accélérateur selon le principe du scanner utilisé en radiodiagnostic. Le traitement est effectué avec des photons de 6 MV et la dégradation de cette énergie à 3 MV permet d’acquérir une imagerie pour la dosimétrie et de vérifier le positionnement quotidien du patient à chaque séance (technique de la radiothérapie guidée par l’image). Les premières études dosimétriques comparatives laissent entrevoir une certaine supériorité de la tomothérapie hélicoïdale sur les accélérateurs linéaires classiques. II est cependant nécessaire d’attendre les résultats des études cliniques en cours pour juger du bénéfice pour les patients en termes de tolérance et de contrôle local.
Abstract
The most important characteristic of the TomoTherapy® Hi-Art System™ is its combination of conformal intensity modulated radiation therapy with a helical radiation delivery pattern generated by the simultaneous movement of the treatment table and rotation of the accelerator, as in helical scanners used in medical imaging. Treatment makes use of 6 MV radiation, with the capacity to lower the level to 3 MV to determine patient positioning before each treatment session (image guided radiation therapy). Comparative dosimetric studies favoured helical tomotherapy over conventional linac systems, but the results of ongoing clinical studies are needed to evaluate the therapeutic gain for patients in terms of toxicity and local control.
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Mahé, M.A., Lisbona, A., Mazal, A. et al. La tomothérapie hélicoïdale: un appareil dédié pour la RCMI. Oncologie 9, 447–450 (2007). https://doi.org/10.1007/s10269-007-0646-9
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DOI: https://doi.org/10.1007/s10269-007-0646-9
Mots clés
- Tomothérapie hélicoïdale
- Radiothérapie conformationnelle avec modulation d’intensité
- Radiothérapie guidée par l’image