Stereotactic radiosurgery results in three cases of intramedullary spinal cord arteriovenous malformations.

Background Context: Intramedullary spinal cord arteriovenous malformations (AVMs) are rare and have an unfavorable prognosis. We report our experience of treating three symptomatic patients with stereotactic radiosurgery (SRS). The standard treatment for these lesions are embolization or microsurgical resection.

Monte Carlo and ray tracing algorithms in the cyberknife treatment planning for lung tumours- comparison and validation.

Multiplan treatment planning system, used with Cyberknife system, provides the option of using either the ray tracing algorithm or the Monte Carlo algorithm for the final dose calculation. In order to compare and validate the dose calculations of these algorithms, especially in a heterogeneous medium, a lung phantom study was carried out. Validation has been done with thermoluminiscent dosimetry (TLD) using lithium fluoride rods for the point doses and film dosimetry using EBT2 films for the dose distribution.

Influence of smoothing algorithms in Monte Carlo dose calculations of cyberknife treatment plans: a lung phantom study.

Aim: The Monte Carlo dose calculation algorithm yields accurate dose distributions in heterogeneous media and interfaces. The Monte Carlo calculation algorithm provided in the Multiplan Cyberknife treatment planning system (Accuray, Sunnyvale, CA, USA) has five different dose-smoothing algorithms in it. As the principle of smoothing of these algorithms is different, they can produce a disparity in the final dose distribution.

A phantom study to determine the optimum size of a single collimator for shortening the treatment time in CyberKnife stereotactic radiosurgery of spherical targets.

Prolonged treatment execution time is a concern in CyberKnife robotic radiosurgery. Beam reduction and node reduction technique, and monitor unit optimization methods are adopted to reduce the treatment time. Usage of single collimator in the CyberKnife treatment plan can potentially reduce collimator exchange time.

Dosimetric comparison of Linac-based (BrainLAB®) and robotic radiosurgery (CyberKnife ®) stereotactic system plans for acoustic schwannoma.

A dosimetric comparison of linear accelerator (LA)-based (BrainLAB) and robotic radiosurgery (RS) (CyberKnife) systems for acoustic schwannoma (Acoustic neuroma, AN) was carried out. Seven patients with radiologically confirmed unilateral AN were planned with both an LA-based (BrainLAB) and robotic RS (CyberKnife) system using the same computed tomography (CT) dataset and contours. Gross tumour volume (GTV) was contoured on post-contrast magnetic resonance imaging (MRI) scan [planning target volume (PTV) margin 2 mm].