Introduction Polymer gel dosimeters offer a practical solution to 3D dose verification for conventional radiotherapy as well as intensity-modulated and stereotactic radiotherapy. In this study, EGSnrc calculated and PAGAT polymer gel dosimeter measured dose profiles from single shot irradiation with 18 mm collimator of Gamma Knife in homogeneous and inhomogeneous phantoms were compared with eac...

In the algorithm of Leksell GAMMAPLAN (the treatment planning software of Leksell Gamma Knife), scattered photons from the collimator system are presumed to have negligible effects on the Gamma Knife dosimetry. In this study, we used the EGS4 Monte Carlo (MC) technique to study the scattered photons coming out of the single beam channel of Leksell Gamma Knife. The PRESTA (Parameter Reduced Elec...

BACKGROUND AND PURPOSE Gamma knife radiosurgery is an alternative for the treatment of medically refractory trigeminal neuralgia. Few reports of posttreatment MR imaging appearance of cranial nerve V exist. Our purpose was to define MR imaging characteristics in cranial nerve V after gamma knife radiosurgery. METHODS We retrospectively reviewed MR images of 15 patients who underwent gamma kni...

Penetrating spinal cord injuries caused by stab wounds are rare. Such injuries may result from a direct lesion of the neural elements of the spinal cord, cord infarcts or, more rarely, intradural or epidural hematoma. In the present study, two cases with spinal cord and L4 root injuries caused by a knife are presented. The first case, a 22-year-old male, referred to our emergency outpatient cli...

Background: The present study aims to evaluate the Graded Prognostic Assessment (GPA) score for predicting overall survival in patients diagnosed with brain metastases undergoing Gamma-knife radiosurgery. Methods: This was a cross sectional study conducted on the patients diagnosed with brain metastases undergoing Gamma-knife radiosurgery during 2003 to 2011. Clinical and radiological parameter...

BACKGROUND Endoscopic submucosal dissection (ESD) is accepted as a minimally invasive treatment for early gastric cancer, however, it is not widely used in the colorectum because of its technical difficulty. OBJECTIVE To determine the feasibility of using ESD for treating large superficial colorectal tumors. PATIENTS A total of 400 consecutive patients were treated by ESD for 405 lesions at...

Introduction Occasional difficulty is experienced in mobilizing the posterior horn of the medial meniscus, in spite of the use of the special cartilage knives and snares that have been designed to overcome this. The purpose of this paper is to describe a modification of the standard meniscectomy procedure and thereby simplify it. The modification consists of the section of the posterior attachm...

Cerebral arteriovenous malformations (AVM), regardless of the mode of discovery, have an annual risk of hemorrhage of approximately 4 percent. A progressive obliterative vasculitis culminating in the occlusion of an AVM may be induced by the administration of radiation doses of approximately 20 Gy given in a single fraction. The process takes about two years and occlusion occurs in approximatel...

Purpose: Non–small cell lung cancer (NSCLC) includes a spectrum of radiosensitive and radioresistant tumors. However, little is known about the molecular determinants of cellular radiation responses. We examined clinical outcomes after gamma knife radiotherapy for NSCLC intracranial metastases to evaluate the use of this model for determining radiosensitive tumor genotypes. Experimental Design:...