An accurate and fast radiation dose calculation is essential for successful radiation radiotherapy. The aim of this study was to implement a new graphic processing unit (GPU) based radiation therapy treatment planning for accurate and fast dose calculation in radiotherapy centers. A program was written for parallel running based on GPU. The code validation was performed by EGSnrc/DOSXYZnrc. Mor...

This paper proposes a soft tissue grasping deformation model, where BP neural network optimized by the genetic algorithm is used to realize real-time and accurate interaction of during virtual surgery. In epidermis divided into meshes, meshes generate displacements under action tension. The relationship between tension displacement mesh determined proposed cylindrical spiral spring model. train...

Purpose The purpose of this study is to use the Freeform Reversible Embedding Suspended Hydrogels (FRESH) additive manufacturing (AM) technique for a liver phantom which can mimic corresponding soft living tissue. One possible applications surgical planning. Design/methodology/approach A thermo-reversible Pluronic® F-127-based support bath used FRESH technique. To verify how three-dimensional (...

Introduction The Gamma Knife system is designed solely for non-invasive treatment of brain disorders, and it benefits from stereotactic surgical techniques. Dose calculations required in the system are performed by GammaPlan code; in this code, brain tissue is considered uniform. In the present study, we evaluated the effect of Gamma Knife system on the obtained dose through simulating a real ...

Objectives The aim of this in vitro study was to evaluate how a deviation from the horizontal plane, affects the image quality in two different CBCT-devices. Methods A phantom head SK150 (RANDO, The Phantom Laboratory, Salem, NY, USA) was examined in two CBCT-units: Accuitomo 80 and Veraviewepocs 3D R100 (J. Morita Mfg. Corp. Kyoto, Japan). The phantom head was placed with the hard palate par...

objectives: the purpose of this study was to determine buccal bone and soft tissue thicknesses and their correlation in the maxillary anterior region using cone beam computed tomography (cbct). materials and methods: in this cross sectional study, 330 sound maxillary incisors in 60 patients with a mean age of 37.5 years were assessed by cbct scans. for better visualization of soft tissue, patie...

For PET and SPECT, it is important to obtain accurate attenuation ( ) maps of thorax under conditions where counts are low. We previously proposed (Hsiao, Rangarajan, Gindi; Proc. IEEE Med. Img. Conf., 1998) a Bayesian reconstruction method in which the prior is base on a gamma mixture model. This method models the object as comprising attenuation coefficients that cluster into few (e.g. soft t...