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A comparison of the gamma knife model C and the automatic
positioning system with Leksell model B
Tlachacova D, Schmitt M, Novotny J Jr, Novotny J, Majali M, Liscak R
Departments of Stereotactic and Radiation Neurosurgery, and Medical Physics,
Na Homolce Hospital, Prague, Czech Republic. daniela.tlachacova@homolka.cz
Object. The 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).
Methods. Data 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.
Conclusions. With
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.
PMID: 15662775 [PubMed - indexed for MEDLINE]
Source: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=15662775
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