introduction: skull base meningiomas constitute a large proportion of the meningiomas, which are the most common benign brain tumors. the treatment of skull base meningiomas is specially challenging and controversial due to the proximity of these tumors to the vital brain structures. radiosurgery is now emerging as an efficient alternative treatment modality which involves the ablation of tumor...

Introduction: Stereotactic radiosurgery (SRS) is one of the conformal radiotherapy methods and Gamma Knife is a non-invasive SRS technique to treat intracranial lesions with 201 Co- 60 sources without need to surgery and bleeding. Beam penumbra phenomenon leads to irradiation outside the field and normal tissues. Therefore, considering it is momentous to attain the acceptable t...

In order to increase the structural performance of rotary tillage knife, a badger claw toe was selected as bionic prototype and optimization design knife carried out. The similarity between badger’s tiller is 0.7073 by fuzzy algorithm, shape goodness fit final mole’s digging shovel 0.9556 MATLAB. Using 3D modeling software NX10.0, we established three-dimensional model knife. Furthermore, use W...

Image formation with partially coherent radiation is evaluated with the Hopkins formula and then applied to x-ray microscopy. Image characteristics expected from instruments with circular and annular pupils in partially coherent conditions are considered for two-point objects and a knife-edge object. The theoretically expected values for image characteristics that are easy accessible by an expe...

Securing the knives merely involves dropping them into the rectangular slot and fitting the free-clearance pin, which is secured in place by a simple split pin. Because of the forwardtilted knife mounting, both the centrifugal and the cane reaction forces on the knives are in the same backward direction. This ensures that although loosely mounted, the knife remains firmly located against stops ...

The regular production of a satisfactory edge on a microtome knife for the cutting of sections as thin as 2 u, which are free from scores and other blemishes, is a serious technical problem in histological laboratories. Eyen when a good edge is produced on a knife, its life is generally limited because contact with any hard material in the specimen may damage the delicate edge, causing it to sc...

BACKGROUND Trigeminal neuralgia is a debilitating condition caused by compression of the trigeminal nerve, ganglions, or divisions. Gamma knife radiosurgery has been increasingly used in the treatment of trigeminal neuralgia as a non-invasive alternative to microvascular decompression and rhizotomies. METHODS We reviewed the medical literature regarding outcomes, time course, and prognostic f...

BACKGROUND We present a rare case of an intraparenchymal nonmissile penetrating spinal injury (NMPSI) occurring at the T11 level in a patient presenting without neurological deficit. CASE DESCRIPTION The patient sustained a knife wound that penetrated the lamina without incurring bony injury and entered the spinal cord at the T11 level. During surgery, the intramedullary penetration of the co...

Plasma knife (PK) assisted UPPP is a modification of the procedure original described by Fujita for snoring. Plasma knife is used for tonsillectomy, hemostasis and to reduce scar contracture lowering incidence of dehiscence (1%) as a result of the reduced thermal injury. Cold knife resection of uvula is limited to the anterior mucosa and any submucosal; preserving the muscularis uvulae and post...

In this paper, a blind restoration method is presented to remove the blur in remote sensing images. An alternating minimization (AM) framework is employed to simultaneously recover the image and the point spread function (PSF), and an adaptive-norm prior is used to apply different constraints to smooth regions and edges. Moreover, with the use of the knife-edge features in remote sensing images...