نتایج جستجو برای: رادیوگرافی cbct

تعداد نتایج: 5866  

2010
Weigang Hu Jinsong Ye Jiazhou Wang Xuejun Ma Zhen Zhang

BACKGROUND To evaluate the accuracy of using kilovoltage x-ray cone-beam computed tomography (kV-CBCT) imaging for in vivo dose calculations. METHODS A Region-of-Interest (ROI) CT number mapping method was developed to generate the cone-beam CT number vs. relative electron density calibration curve for 3D dose calculations. The stability of the results was validated for three consecutive mont...

2012
Yasas S. N. Jayaratne Colman P. J. McGrath Roger A. Zwahlen

BACKGROUND Cone-beam Computed Tomography (CBCT) and stereophotography are two of the latest imaging modalities available for three-dimensional (3-D) visualization of craniofacial structures. However, CBCT provides only limited information on surface texture. This can be overcome by combining the bone images derived from CBCT with 3-D photographs. The objectives of this study were 1) to evaluate...

Journal: :Physics in medicine and biology 2012
X Zhen H Yan X Gu L Zhou X Jia S Jiang

PURPOSE To develop and validate a robust CT to cone-beam (CBCT) deformable image registration algorithm that can handle CBCT artifacts and intensity inconsistency, and thus can yield accurate registration results. METHODS We propose a new algorithm called Deformation with Intensity Simultaneously Corrected (DISC). DISC distinguishes itself from the original demons by performing an intensity c...

Journal: :Dento maxillo facial radiology 2009
R Christiansen L-L Kirkevang E Gotfredsen A Wenzel

OBJECTIVES Our aim was to compare periapical radiography and cone beam CT (CBCT) for assessment of the periapical bone defect 1 week and 12 months after root-end resection. METHODS 50 patients (58 teeth) with a persisting apical periodontitis in a root-filled tooth (incisor, canine or premolar) were treated with root-end resection. 1 week and 12 months post-operatively, a CBCT scan (NewTom 3G...

خلاصه: سابقه و هدف: توانایی تخمین ثبات اولیه ایمپلنت و کیفیت استخوان قبل از جراحی در ناحیه قراردادن ایمپلنت، امکان انتخاب پروتکل درمانی مناسب را فراهم می کند. هدف از این مطالعه تعیین کیفیت  استخوانی در ناحیه جایگذاری ایمپلنت با استفاده از CBCT gray values(bone density values) و بررسی ارتباط ان باثبات اندازه گیری شده بلافاصله بعد از جایگذاری ایمپلنت می باشد. مواد و روش‌ها: در این مطالعه تجربی ت...

Ahdiyeh Aghaz Bahador Bahadorzadeh, Hossein Ghadiri, Mohammad Reza Deevband Mohammad Reza Kardan Yaser Kasesaz,

Introduction: Cone-beam CT (CBCT) is an imaging system which offers three-dimensional (3D), multiplanar images and has many advantages over computed tomography (CT) including shorter acquisition times for the resolution desired in dentistry, lower radiation dose to the patient, reasonable price and higher spatial resolution but CBCT scanners are unable to display actual Hounsf...

2018
Kihong Son Jieun Chang Hoyeon Lee Changhwan Kim Taewon Lee Seungryong Cho Sohyun Park Jin Sung Kim

To reduce the radiation dose given to patients, a tube current modulation (TCM) method has been widely used in diagnostic CT systems. However, the TCM method has not yet been applied to a kV-CBCT system on a LINAC machine. The purpose of this study is to investigate if a TCM method would be desirable in a kV-CBCT system for image-guided radiation therapy (IGRT) or not. We have developed an atte...

2010
L. T. Hiew Kelvin W.C. Foong

Cone beam computed tomography (CBCT) can provide dentists with accurate 3D diagnostic images of the maxillofacial region at a lower irradiation dose compare to conventional medical CT. Due to low image contrast, higher image noise and missing image boundaries, tooth segmentation in CBCT is difficult even with experienced radiographic interpreters. In this paper, we proposed a graph cuts segment...

2015
Prashant P. Jaju Sushma P. Jaju

Cone-beam computed tomography (CBCT) is routinely recommended for dental diagnosis and treatment planning. CBCT exposes patients to less radiation than does conventional CT. Still, lack of proper education among dentists and specialists is resulting in improper referral for CBCT. In addition, aiming to generate high-quality images, operators may increase the radiation dose, which can expose the...

Journal: :American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics 2009
Dan Grauer Lucia S H Cevidanes William R Proffit

The increasing use of cone-beam computed tomography (CBCT) requires changes in our diagnosis and treatment planning methods as well as additional training. The standard for digital computed tomography images is called digital imaging and communications in medicine (DICOM). In this article we discuss the following concepts: visualization of CBCT images in orthodontics, measurement in CBCT images...

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