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Table 6 shows actuarial results for patients stratified by SMG. For SMG 1-4, the percentage of patients with excellent outcomes were 100, 56, 80, and 0 , respectively. Although a correlation was found between SMG and excellent non-excellent outcomes by Fisher's exact test (p 0.0081), Spearman's correlation coefficient was insignificant at 0.34 (p 0.15). In our study, AVM patients were treated with Radionics XKnife LINAC-based radiosurgery. Both Spearman's correlation coefficient and Fisher's...

Accurate targeting is essential for intracranial and extracranial stereotactic radiosurgery and for most of the modern

Target localization is often employed to achieve such accurate positioning 1-6 . BrainLab Novalis unit is one of the dedicated radiosurgery systems employing such image guided localization devices. It uses a combination of the optical tracking system with the external infrared markers (ExacTrac system) and the X-ray image guidance system with the internal bony anatomy to localize the target. The external marker based ExacTrac system has a precision of 0.3 mm to identify an external marker in a...

In Vicenza Neurosurgery Department cerebral arteriovenous malformations AVMs radiosurgery was introduced in 1984 A

Meningioma

Radiosurgical procedure with the Cyberknife. Fig. 1. Radiosurgical procedure with the Cyberknife. patients with good results 1, 2 . From a statistic evaluation of treated patient population, we found that bleeding recurrence in the latency period - the main shortcoming of AVMs radiosurgery - might be related to poor dose homogeneity inside the nidus of large volume AVMs, a characteristic feature of isocentric procedures 3 . Since January 2003, a frameless, image-guided robotic...

How Can Tumor Effect and Normal Tissue Effect Be Balanced in Stereotactic Body Radiotherapy

Fenwickc, Minesh P. Mehtaa Departments of aHuman Oncology and bMedical Physics, University of Wisconsin, Madison, Wise., USA CDepartment of Physics, Clatterbridge Centre for Oncology, Bebington, Wirral, UK Methods for selection of appropriate dose fractionation schedules for stereotactic body radiotherapy that have both an equivalent tumor effect for lesions of varying size and ensure an acceptable risk of clinically manifest radiation pneumonitis have not been...