• Daniela Tlachacova, Michal Schmitt, Josef Novotny, Mustafa Majali, and Roman Liscak.
• Departments of Stereotactic and Radiation Neurosurgery, and Medical Physics, Na Homolce Hospital, Prague, Czech Republic. daniela.tlachacova@homolka.cz
• J. Neurosurg. 2005 Jan 1; 102 Suppl: 25-8.

ObjectThe authors sought to compare the quality of treatment planning, radiation protection, and the time taken for treatment in the Leksell gamma knife model B with that using the model C Automatic Positioning System (APS).MethodsData were obtained in 463 patients treated with the B model and 518 patients treated with the C model. Data were analyzed in patients in whom the following diagnoses had been made: vestibular schwannoma, pituitary adenoma, meningioma, solitary metastasis, and other benign and malignant solitary tumors. Patients with arteriovenous malformations, ocular lesions, and functional diagnoses were excluded from this study.ConclusionsWith the C model there was a better conformity for most treated targets, such as vestibular schwannomas (p = 0.005) and meningiomas (p = 0.015). The level of radiation exposures to personnel was significantly decreased when using the model C (p < 0.001). There was no significant difference in radiation exposure of extracranial structures for the same number of shots in patients treated by both models. The mean time saved using the C model with the APS was 41 minutes per treatment. It would seem that the gamma knife model C permits better dose conformity, shorter treatment times, and less radiation exposure to personnel.

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