It is documented that well-modeled Monte Carlo dose calculation algorithms are more accurate than traditional correction-based algorithms or convolution algorithms at predicting dose distributions delivered to heterogeneous volumes. This increased accuracy has clinical implications for CyberKnife, particularly when comparing dose distributions between the ray-tracing and Monte Carlo algorithms....

The efficacy and toxicity of three-fraction CyberKnife radiotherapy were evaluated in patients with brain metastases in critical areas. One hundred and fifty-nine metastases in 145 patients including tumors >10 cm(3) were treated with three-fraction CyberKnife radiotherapy with a median marginal dose of 27 Gy at a median prescribed isodose of 60%. Changes in the neurological manifestations, loc...

The efficacy and toxicity of five-fraction CyberKnife radiotherapy were evaluated in patients with large brain metastases in critical areas. A total of 85 metastases in 78 patients, including tumors >30 cm(3) (4 cm in diameter) were treated with five-fraction CyberKnife radiotherapy with a median marginal dose of 31 Gy at a median prescribed isodose of 58%. Changes in the neurological manifesta...

The objectives of this study were to estimate global uncertainty for patients with thoracic tumors treated in our center using the CyberKnife VSI after placement of fiducial markers and to compare our findings with the standard CTV to PTV margins used to date. Datasets for 16 patients (54 fractions) treated with the CyberKnife and the Synchrony Respiratory Tracking System were analyzed retrospe...

pathological hormone secretion, the clinical presentation is determined by localization of tumor. Common symptoms include headache and visual field defects. This review addresses pathology aspects diagnosis, conservative treatment, methods radiation therapy. Drug therapy endocrine-inactive adenomas based on presence receptors for somatostatin dopamine in pituitary adenoma cells. Data stereotact...

BACKGROUND The aim of this study was to explore the influence of image-guided tumor localization modality (Synchrony tracking vs. Xsight spine-based localization) on the local efficacy of CyberKnife treatment in lung cancer and lung metastases. METHODS Retrospective analysis of 64 patients with pulmonary metastases and primary tumor cases (72 targets) treated with stereotactic body radiothera...

OBJECTIVE To evaluate the efficacy and safety of CyberKnife(®) treatment for locally-advanced pancreatic cancer (LAPC). METHODS The efficacy of CyberKnife(®) treatment was analyzed in 59 LAPC patients treated between October 2006 and September 2014. The median tumor volume was 27.1 mL (13.0-125.145 mL). The median prescribed dose was 45 Gy (35-50 Gy), delivered in 5 fractions (3-8 fractions)....

In this CyberKnife® dose verification study, we investigated the effectiveness of the novel potential error (PE) concept when applied to the determination of a robust measurement point for targeting errors. PE was calculated by dividing the differences between the maximum increases and decreases in dose distributions by the original distribution after obtaining the former by shifting the source...

INTRODUCTION Post-stereotactic radiation-induced neoplasms, although relatively rare, have raised the question of benefit regarding CyberKnife® treatments versus the risk of a secondary malignancy. The incidence of such neoplasms arising in the nervous system is thought to be low, given the paucity of case reports regarding such secondary lesions. CASE PRESENTATION Here we describe a case of ...

Squamous cell carcinoma of the head and neck (SCCHN) has traditionally been treated with a combination of surgery, chemotherapy, and external beam radiotherapy. While cure is generally the goal of these therapeutic modalities, recurrence is an unfortunately common outcome. Salvage surgery often results in close or positive surgical margins and the patient is at high risk for recurrence. Cyberkn...