نتایج جستجو برای: تکنیک cbct

تعداد نتایج: 31707  

Journal: :Medical physics 2012
O Dzyubak R Kincaid E Yorke A Hertanto Y Hu A Rimner Q Zhang G Mageras

PURPOSE Respiration-induced motion artifacts in cone-beam CT (CBCT) can be corrected using a model of patient motion obtained from respiration-correlated CT (RCCT). This approach assumes that respiration-induced organ deformations at simulation, when RCCT scans are normally acquired, are still valid at treatment. The purpose of this study is to compare lung tumor image quality in motion-correct...

2017
Nilufer Ersan Erdogan Fisekcioglu Semanur Dolekoglu Mehmet Ilguy

Little is known regarding to what extent Cone Beam Computed Tomography (CBCT) has been incorporated into the curriculum of dental schools or to which degree the students are being exposed to it. The objectives of this study were to evaluate the current situation of CBCT in Dentomaxillofacial Radiology (DMFR) education and review the established competences on dentists and DMFR residents on CBCT...

2017
Zhibo Tan Chuanyao Liu Ying Zhou Weixi Shen

In this study, we compared the registration effectiveness of 4D cone-beam computed tomography (CBCT) and 3D-CBCT for image-guided radiotherapy in 20 Stage IA non-small-cell lung cancer (NSCLC) patients. Patients underwent 4D-CBCT and 3D-CBCT immediately before radiotherapy, and the X-ray Volume Imaging software system was used for image registration. We performed automatic bone registration and...

Journal: :Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention 2008
Simon Rit Jochem Wolthaus Marcel van Herk Jan-Jakob Sonke

Respiratory motion causes artifacts in slow-rotating cone-beam (CB) computed tomography (CT) images acquired for example for image guidance of radiotherapy. Respiration-correlated CBCT has been proposed to correct for the respiratory motion, but the use of a subset of the CB projections to reconstruct each frame of the 4D CBCT image limits their quality, thus requiring a longer acquisition time...

Journal: :Journal of endodontics 2011
Yu-Hong Liang Gang Li Paul R Wesselink Min-Kai Wu

INTRODUCTION The outcome predictors identified with data from periapical radiographs (PA) and cone-beam computed tomography (CBCT) scans might not be the same. This retrospective study evaluated various factors that might affect the outcome of root canal therapy. METHODS In total, 115 teeth (143 roots) with vital pulps were endodontically treated and followed up 2 years after treatment. Multi...

Journal: :Dento maxillo facial radiology 2014
J Brown R Jacobs E Levring Jäghagen C Lindh G Baksi D Schulze R Schulze

Cone beam CT (CBCT) is a relatively new imaging modality, which is now widely available to dentists for examining hard tissues in the dental and maxillofacial regions. CBCT gives a three-dimensional depiction of anatomy and pathology, which is similar to medical CT and uses doses generally higher than those used in conventional dental imaging. The European Academy of DentoMaxilloFacial Radiolog...

Journal: :Physics in medicine and biology 2008
T E Marchant C J Moore C G Rowbottom R I MacKay P C Williams

Cone-beam CT (CBCT) images have recently become an established modality for treatment verification in radiotherapy. However, identification of soft-tissue structures and the calculation of dose distributions based on CBCT images is often obstructed by image artefacts and poor consistency of density calibration. A robust method for voxel-by-voxel enhancement of CBCT images using a priori knowled...

2017
Elluru Venkatesh Snehal Venkatesh Elluru

The introduction of cone beam computed tomography (CBCT) devices, changed the way oral and maxillofacial radiology is practiced. CBCT was embraced into the dental settings very rapidly due to its compact size, low cost, low ionizing radiation exposure when compared to medical computed tomography. Alike medical CT, 3 dimensional evaluation of the maxillofacial region with minimal distortion is o...

2013
Chengxin Liu Guanzhong Gong Chen Guo Tonghai Liu Jie Lu Hong Zhao Wei Dong Yong Yin

BACKGROUND To investigate the feasibility of contouring the planning risk organ volume (PRV) for the heart, and to determine the probability of evaluating radiation dose to the heart using kilovoltage-cone beam computed tomography (kV-CBCT) in early-stage non-small-cell lung cancer (NSCLC) patients, who received stereotactic body radiotherapy (SBRT). MATERIALS AND METHODS Seventeen NSCLC pati...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شاهد - دانشکده دندانپزشکی 1394

مقدمه و هدف: هدف از این مطالعه ارائه ی تعریفی جامع از ویژگی های cbct برخی ضایعات رادیولوسنت دهانی است تا در تشخیص و درمان بهتر ضایعات کمک کننده باشد. روش اجرای پژوهش: در این مطالعه 40 ضایعه از بیمارانی که دارای نمای رادیولوسنت در تصویر cbct بودند و به یک مرکز خصوصی مراجعه و دارای تشخیص قطعی هیستوپاتولوژی بودند انتخاب شدند. هر یک از ضایعه ها براساس متغیرهایی همچون اکسپنشن باکال و لینگوال،تاثیر ...

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