نتایج جستجو برای: digital radiography

تعداد نتایج: 325160  

Journal: :iranian endodontic journal 0
abbas mesgarani sina haghanifar maryam ehsani samereh dokhte yaghub ali bijani

introduction: external root resorption (err) is associated with physiological and pathological dissolution of mineralized tissues by clastic cells and radiography is one of the most important methods in its diagnosis. the aim of this experimental study was to evaluate the accuracy of conventional intraoral radiography (cr) in comparison with digital radiographic techniques, i.e. charge-coupled ...

BACKGROUND AND AIM: Digital panoramic X-ray images can be captured using photostimulable phosphors or solid-state detectors (i.e. charge-coupled devices and Flat-Panels). The first category is defined as computed radiography (CR) or semi-direct radiography. The second technology that uses solid-state detectors is known as direct digital radiography (DDR). Both of these technologies have their o...

2008
Hazem M. El-Bakry Nikos Mastorakis

In this paper, a new fast algorithm for dental diseases detection is presented. Such algorithm relies on performing cross correlation in the frequency domain between input image and the input weights of fast neural networks (FNNs). It is proved mathematically and practically that the number of computation steps required for the presented FNNs is less than that needed by conventional neural netw...

Maryam Tofangchiha, Mojtaba Hossein Nahtaj, Neda Hajihassani,

Introduction: External root resorption is a clinical problem that often cannot be detected clinically. Thus, radiography plays a crucial role in its diagnosis. However, optimal radiographic quality with minimal radiation exposure {2.1 [EN] Verify English word/phrase choice} is an important factor in selecting the appropriate radiographic technique. The aim of this study was the comparison of ac...

2017
Sadaksharam Jayachandran

X‐rays were discovered in 1895 by Wilhelm Roentgen. Digital radiology has overtaken conventional screen‐film radiography since it was introduced in the mid‐1980s.[1] Digital imaging uses sensor of solid‐state, and information is presented and stored as an image using a computer. The dawn of the digital era in dental radiography came in 1987 with the first digital radiography system called radio...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
شیرین سخدری shirin sakhdari dental school, islamic azad university, tehran-iran.دانشکده دندانپزشکی، دانشگاه آزاد اسلامی، واحد تهران. پیمان مهرورزفر peyman mehrvarzfar dental school, islamic azad university, tehran-iran.دانشکده دندانپزشکی، دانشگاه آزاد اسلامی، واحد تهران. سمیه صفری somayeh safari مریم پژوتن maryam pazhutan dental school, islamic azad university, tehran-iran.دانشکده دندانپزشکی، دانشگاه آزاد اسلامی، واحد تهران محمدجواد خرازی فرد mohammad-javad kharazifard tehran university of medical sciences, tehran-iran.دانشگاه علوم پزشکی تهران

objective: vertical root fracture (vrf) is among the most common causes of endodontic treatment failures. this study aims to compare charge-coupled devices (ccd) and photostimulable phosphor plates (psp) for detection of vertical root fractures in endodontically treated teeth.   methods: in this diagnostic in vitro study, 40 maxillary anterior teeth were selected and after preparation and root ...

Journal: :iranian endodontic journal 0
maryam tofangchiha assistant professor ,shahid beheshti university of medical sciences,dental faculty,oral medicine department mamak adel mahin bakhshi mahsa esfehani pantea nazeman mojgan ghorbani-elizeyi

introduction: vertical root fracture (vrf) is a complication which is chiefly diagnosed radiographically. recently, film-based radiography has been substituted with digital radiography. at the moment, there is a wide range of monitors available in the market for viewing digital images. the present study aims to compare the diagnostic accuracy, sensitivity and specificity of medical and conventi...

ژورنال: :journal of dental school, shahid beheshti university of medical sciences 0
مسعود ورشوساز massoud varshowsaz dental school, shahid beheshti university of medical sciences, tehran-iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی روشنک غفاری roshanak ghaffari dental school, gilan university of medical sciences, rasht-iranدانشکده دندانپزشکی، دانشگاه علوم پزشکی گیلان

سابقه و هدف: اکثریت پوسیدگی های دندانی، ضایعاتی با حدود نامشخص اند که برای مشاهده آنها بر روی رادیوگراف های conventional باید حدود 40 درصد فرآیند دمینرالیزاسیون صورت بگیرد. تصاویر رادیوگرافی معمول، عمق نفوذ یک ضایعه پوسیدگی را کمتر از مقدار واقعی آن نشان می دهند در حالیکه با استفاده از روش digital subtraction radiography تشخیص تقلیل مواد معدنی به میزان 5-1 درصد در واحد حجم امکان پذیر است. هدف ا...

Journal: :journal of dentistry, tehran university of medical sciences 0
shirin sakhdari azad dental branch ahmad reza talaeipour azad dental branch maziar talaeipour azad dental branch maryam pazhutan sanaz heidarkhan tehrani azad dental branch mohammad javad kharazifard

objectives: this study sought to assess the diagnostic accuracy of cone beam computed tomography (cbct) with different voxel sizes and intraoral digital radiography with photostimulable phosphor (psp) plate for detection of periapical (pa) bone lesions. materials and methods: in this ex vivo diagnostic study, one-millimeter defects were created in the alveolar sockets of 15 bone blocks, each wi...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید