background and aims. at present, cone beam computed tomography (cbct) has become a substitute for computed tomography (ct) in dental procedures. the metallic materials used in dentistry can produce artifacts due to the beam hardening phenomenon. these artifacts decrease the quality of images. in the present study, the number of artifacts as a result of beam hardening in the images of dental imp...

tappeh bazgir is located 76km northeast of torang tappeh at the eastern fringes of the gorgan plain. the metal hoard was discovered in 2001 and excavated in 2010. the hoard is composed of a diverse assemblage and date back to the late bronze age / hissar iiic). we investigated six artifacts for studies using different methods such as metallographic studies, sem-eds, xrd, and some chemical analy...

brain-computer interfaces (bci) record brain signals, analyze and translate them into control commands which are relayed to output devices that carry out desired actions. these systems do not use normal neuromuscular output pathways. actually, the principal goal of bci systems is to provide better life style for physically-challenged people which are suffered from cerebral palsy, amyotrophic la...

introduction: nowadays, imaging of the myocardial perfusion (mpi) using the single photon emission tomography (spet) in the diagnosis of coronary artery disease, especially myocardial ischemia, is of great importance. in contrast to the coronary artery angiography, mpi is non-invasive, less expensive and more physiological. unfortunately, this image is affected by the some artifacts. these arti...

Tepeh Baluch is located in the northeast of Iran in Khorasan Razavi Province and in the west of Neyshabour Miankouh Plain. Prehistoric studies, especially the Neolithic period of this section of the Iranian Plateau have been less considered compared with the western part. Tepeh Baluch was explored during a short season in the spring and summer of 2011 under the support of Neyshabur University. ...

conclusions the type of materials can influence the obtained gsv. different materials cause various amounts of artifacts due to differences in density and atomic number. results according to the mean gsv of the five different materials, the majority of artifacts produced were as follows: tempbond > zoe > mta > gi (chemfil dentsply) > gi (gc, fuji ιx). materials and methods samples of five cemen...