Shahdad and Yahya which are two important prehistoric sites in the Kerman Province, are of most important forArchaeometallurgical studies. During excavations at these sites a number of metal objects have been discovered.Moreover, evidence of metal working on the surface testify to manifacturing of metal objects. This also shows that thesite might have experienced craft specialization.The follow...

ANSWERS 1. e. none of the above The ECG represents a pseudo-arrhythmia due to artifacts. Two clues direct you to the correct interpretation. The first clue reveals sinus rhythm in lead II. The normal appearance of the complexes in lead II is a result of the cancellation of artifacts and not because of a transient return to normal rhythm. The second clue is that most of the leads show sharp defl...

This paper addresses the question if artifacts may be attributed some kind of agency. I take an activity-theoretical and instructional perspective, and argue that artifacts are used to guide actions. In other words, I claim that artifacts have instructional impact. In the introductory part of the paper is given an account of how three kinds of artifacts physical artifacts, linguistic representa...

Artifacts can be defined as any structure in an ultrasound image that does not have a corresponding anatomic tissue structure. Artifacts are a common occurrence in an ultrasound display since they are often the result of the physical properties of ultrasound itself. Recognizing artifacts is essential to proper ultrasound interpretation, as not identifying an artifact as such may lead to unwarra...

Artifacts pervade our lives, our every activity. The speed, power, and intelligence of human beings are drambtically enhanced by the invention of artificial devices, so much so that tool making and usage constitute one of the defining characteristics of our species. Many artifacts make us stronger or faster, or protect us from the elements or predators, or feed and clothe us. And many artifacts...

Introduction: Motion of the patient during myocardial perfusion SPECT could potentially results in false perfusion defects. The effect of different reconstruction methods on these artifacts is not studied. Clarification of the relation between the extent, severity and duration of motion with the resultant artifacts may be helpful in designing special soft wares for motion correction. This...

Aim: The aim of this in vitro study was to evaluate imaging artifacts induced by Titanium, Zirconium, Titanium-Zirconium abutments in CT, MRI and CBCT imaging modalities.Methods: A 4×8mm titanium fixture was inserted in a dry human mandible. Titanium, Zirconium and Titanium–Zirconium abutments measuring 10.5 mm in height are located on the fixture, one by one. Each abutment was scan...

Introduction: Metallic artifacts due to pacemaker/ implantable cardioverter defibrillator (ICD) leads in CT images can produce artifactual uptake in cardiac SPECT/CT images. The aim of this study was to determine the influence of the metallic artifacts due to pacemaker and ICD leads on myocardial SPECT/CT imaging. Methods: The study included 9 patients wh...