نتایج جستجو برای: mass segmentation

تعداد نتایج: 541687  

Journal: :journal of medical signals and sensors 0
parinaz mortaheb mehdi rezaeian

segmentation and three‑dimensional (3d) visualization of teeth in dental computerized tomography (ct) images are of dentists’ requirements for both abnormalities diagnosis and the treatments such as dental implant and orthodontic planning. on the other hand, dental ct image segmentation is a difficult process because of the specific characteristics of the tooth’s structure. this paper presents ...

Journal: :Signal Processing 2014
Praful Agrawal Mayank Vatsa Richa Singh

Screening mammography has been successful in early detection of breast cancer, which has been one of the leading causes of death for women worldwide. Among commonly detected symptoms on mammograms, mass detection is a challenging problem as the task is affected by high complexity of breast tissues, the presence of pectoral muscles as well as varying shape and size of masses. In this research, a...

2009
Jing Cui Berkman Sahiner Heang-Ping Chan Alexis Nees Chintana Paramagul Lubomir M. Hadjiiski Chuan Zhou Jiazheng Shi

Segmentation of masses is the first step in most computer-aided diagnosis (CAD) systems for characterization of breast masses as malignant or benign. In this study, we designed an automated method for segmentation of masses on ultrasound (US) images. The method automatically estimated an initial contour based on a manually-identified point approximately at the mass center. A two-stage active co...

Journal: :مدیریت بازرگانی 0
پرویز احمدی دانشگاه تربیت مدرس عادل آذر دانشگاه تربیت مدرس فردیس صمصامی دانشگاه تربیت مدرس

like other sciences, market segmentation, as a science, seeks to realize unique needs of human being. in health market, individual diagnostic and curative methods are practiced more than anytime. however, a foundation of this market, pharmaceutical market, is not as advanced as other products and services markets in terms of segmentation. regarding the complexity of pharmaceutical market, it is...

Arman Rahmim Maryam Shirmohammad Mohammad Reza Ay, Saeed Sarkar

Introduction:  The  advent  of  dual-modality  PET/CT  scanners  has  revolutionized  clinical  oncology  by  improving lesion localization and facilitating treatment planning for radiotherapy. In addition, the use of  CT images for CT-based attenuation correction (CTAC) decreases the overall scanning time and creates  a noise-free  attenuation  map  (6map).  CTAC  methods  include  scaling,  s...

Journal: :iranian journal of medical physics 0
mohammad hosntalab ph.d., student, faculty of engineering, science and research branch, islamic azad university (iau), tehran, iran reza aghaeizadeh zoroofi associate professor, control and intelligent processing center of excellence, school of electrical and computer engineering, college of engineering, university of tehran, tehran, iran ali abbaspour tehrani-fard assistant professor, faculty of engineering, science and research branch, islamic azad university (iau), tehran, iran gholamreza shirani assistant professor, oral & maxillofacial surgery department, faculty of dentistry medical science of tehran university, tehran, iran

introduction: various computer assisted medical procedures such as dental implant, orthodontic planning, face, jaw and cosmetic surgeries require automatic quantification and volumetric visualization of teeth. in this regard, segmentation is a major step. material and methods: in this paper, inspired by our previous experiences and considering the anatomical knowledge of teeth and jaws, we prop...

Journal: :international journal of hospital research 2013
toktam khatibi mohammad mehdi sepehri pejman shadpour

background and objectives: identification of surgical instruments in laparoscopic video images has several biomedical applications. while several methods have been proposed for accurate detection of surgical instruments, the accuracy of these methods is still challenged high complexity of the laparoscopic video images. this paper introduces a surgical instrument detection framework (sidf) for a...

Journal: :journal of medical signals and sensors 0
narges norozi reza azmi

breast lesion segmentation in mr images is one of the most important parts of clinical diagnostic tools. pixel classification methods have been frequently used in image segmentation with two supervised and unsupervised approaches up to now. supervised segmentation methods lead to high accuracy, but they need a large amount of labeled data, which is hard, expensive, and slow to be obtained. on t...

Journal: :journal of advances in computer research 0
marzieh azarian department of computer engineering and information technology, science and research branch, islamic azad university, khouzestan-iran reza javidan department of computer engineering and it, shiraz university of technology, shiraz, iran mashallah abbasi dezfuli department of computer engineering and information technology, science and research branch, islamic azad university, khouzestan-iran

texture image analysis is one of the most important working realms of image processing in medical sciences and industry. up to present, different approaches have been proposed for segmentation of texture images. in this paper, we offered unsupervised texture image segmentation based on markov random field (mrf) model. first, we used gabor filter with different parameters’ (frequency, orientatio...

Journal: :journal of medical signals and sensors 0
mostafa ghelich oghli vahab dehlaghi ali mohammad zadeh alireza fallahi mohammad pooyan

assessment of cardiac right‑ventricle functions plays an essential role in diagnosis of arrhythmogenic right ventricular dysplasia (arvd). among clinical tests, cardiac magnetic resonance imaging (mri) is now becoming the most valid imaging technique to diagnose arvd. fatty infiltration of the right ventricular free wall can be visible on cardiac mri. finding right‑ventricle functional paramete...

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