background: paratracheal air cysts (pacs) are extraluminal collections of air mostly located adjacent to the right of the trachea at the level of the thoracic inlet. although, pacs are usually asymptomatic, the lesions do occasionally cause complications such as chronic cough, difficult intubation, and right-sided recurrent laryngeal nerve palsy. the purpose of the present study was to demonstr...

objectives: new digital two-dimensional imaging systems are considered as an easily accessible modality for sinonasal evaluation. the aim of this study was to assess the diagnostic efficacy of digital waters’ and caldwell’s radiographic views for evaluation of sinonasal area. materials and methods: a total of 273 patients fulfilling the inclusion criteria were enrolled in this descriptive-analy...

objective(s): in positron emission tomography (pet) studies, thoracic movement under free-breathing conditions is a cause of image degradation. respiratory gating (rg) is commonly used to solve this problem. two different methods, i.e., phase-gating (pg) and amplitude-gating (ag) pet, are available for respiratory gating. it is important to know the strengths and weaknesses of both methods when...

objective: cone beam computed tomography (cbct) is applied for the imaging of the maxillofacial and dental structures, particularly for surgical treatments and dental implants. the aim of this study was to assess the effect of slice thickness on the accuracy of cbct linear measurements. methods: in this diagnostic accuracy study, forty-two titanium pins with the same dimensions were inserted in...

purpose : to report the evaluation of the treatment response in choroidal hemangioma with application of enhanced depth imaging optical coherence tomography (edi-oct) technique case report : a 73-year-old woman with a circumscribed choroidal hemangioma in the posterior pole of her left eye underwent photodynamic therapy and intravitreal injection of bevacizumab. edi-oct obtained from the affect...

we study the problem of reconstructing binary images from four projections data in a fuzzy environment. given the uncertainly projections,w e want to find a binary image that respects as best as possible these projections. we provide an iterative algorithm based on fuzzy integer programming and linear membership functions.

abstract introduction: temporomandibular joint disorders (tmd) are the most common disorders of the jaw, and despite their clinical importance, they are not completely understood. this study was aimed to evaluate the changes of temporomandibular joint (tmj) on cone beam computed tomography (cbct) images in disc displacement vs. osteoarthritis of the tmj. methods: in this study, 45 patients, inc...

background: coronary computed tomography angiography (ccta) is a well-known method for evaluating anatomic coronary stenosis, but the reliability of ccta to predict cardiovascular events is an issue of controversy. materials and methods: in this prospective observational study, 58 patients with acute chest pain and low-to-moderate risk were selected and ccta was performed on them. during follow...

background and aims. because of increasing concerns about surgeries in the anterior maxilla, including implant placement, it is necessary to examine the morphology of the nasopalatine canal and its surrounding bones. this study aimed to analyze the shape and position of the nasopalatine canal and incisive foramen using cone-beam computed tomography (cbct). materials and methods. cbct images of ...

introduction: timely diagnosis and treatment of post traumatic, elevated intracranial pressure (eicp), could reduce morbidity and mortality, as well as improve patients’ outcome. this study is trying to evaluate the diagnostic accuracy of sonographic optic nerve sheath diameter (onsd) in detection of eicp. methods: sonographic onsd of patients with head trauma or cerebrovascular accident suspic...