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دراسة تحليلية لأنظمة استرجاع الصور الطبية اعتماداً على المحتوى
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Added by
Damascus University ورقة بحثية
Publication date
2012
fields
Medical Device Engineering
and research's language is
العربية
Created by
Shamra Editor
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تعد أنظمة استرجاع الصور الطبية اعتماداً على المحتوى من التقنيات الحديثة التي يسعى الباحثون إلى تكاملها مع أنظمة التشخيص بمساعدة الحاسوب. تقوم هذه الأنظمة أساساً بإيجاد صور في قاعدة بيانات تضم مجموعة كبيرة من الصور ذات محتوى مشابه لصورة استعلام معينة. يجري الاستعلام عن طريق استخلاص الخصائص البصرية للصورة المعينة و صياغتها في متجه خصائص تَُقارن مكوناته بمتجهات الخصائص للصور الموجودة في قاعدة البيانات و يقاس التشابه، و من ثم تسَترجع الصور التي لها محتوى مشابه لصورة الاستعلام. تقدم هذه الورقة تقييماً للوضع الراهن لأنظمة استرجاع الصور الطبية اعتماداً على المحتوى بناء على دراسة تحليلية للبحوث الحديثة المنشورة، و تخلص إلى استنتاج اتجاهات بحثية محددة في هذا المجال.
Content Based Medical Image Retrieval (CBMIR) systems are a new technique which researchers aim to integrate with Computer Aided Diagnosis systems. These systems usually find and retrieve images from a large image-database which have a similar content to a query image. Retrieval is done by extracting the visual features from the query image, formulating them in a features vector, comparing features vector components with those of the images in the database, and then, similarity measures are computed. Based on the similarity measures, images which have a similar content to the query image are retrieved. The introduced analysis study surveys and analyzes the current status of the CBMIR systems, evaluates our findings from this survey, and concludes some specific research directions in this field.
References used
Müller H, Michoux N, Bandon D, Geissbuhler A. (2004) "A review of content-based image retrieval systems in medical applications-clinical benefits and future directions", International Journal of Medical Informatics, vol. 73, pp.1-23
Pinhas, A T, Greenspan H. (2007) "Medical Image Categorization and Retrieval for PACS Using the GMM-KL Framework" Information Technology in Biomedicine, IEEE Transactions on, vol. 11, no. 2, pp. 190-202
Akgül C B, Rubin D L, Napel S, Beaulieu Ch F, Greenspan H, Acar B. (2011) "Content-based image retrieval in radiology: current status and future directions" Journal of digital imaging, vol. 24, no. 2, pp. 208-222
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هدفنا من خلال هذه الدراسة في إطار المشروع الفصلي للسنة الرابعة إلى إلقاء الضوء على استرجاع الصور من مجموعة كبيرة بالاعتماد على محتوى صورة هدف , و قمنا بتدعيم هذه الدراسة بتطبيق ضمن بيئة الماتلاب لبرنامج بحث عن الصور المشابهة لصورة مدخلة .
و قد تركز
بحثنا على ميزتين هامتين يكاد لا يخلو منها أي نظام بحث عن الصور بالاعتماد على المحتوى و هما ميزتي الهيستوغرام اللوني و بنية الصورة texture , ووضحنا الخطوات التي يتم في ضوئها عملية الاسترجاع بدءاً من تحليل الصورة و استخلاص شعاع الواصفات الخاص فيها , و مطابقته مع أشعة الميزات الخاصة بالصور الموجودة في قاعدة البيانات ليتم ترتيب الصور بحسب مدى تشابهها من الصورة الهدف .
و تطرقت الدراسة إلى استخدام الفضاء اللوني HMMD كبديل للفضاء اللوني RGB لاستخراج واصفات البنية اللونية على اعتبار أنه نموذج لوني موجه بالمستخدم user oriented و بالتالي نضمن أن نحصل على نتائج أفضل ترضي المستخدم .
وقمنا بتدعيم الدراسة بعدد من الأشكال و الأمثلة و المخططات التي توضح محتوى الدراسة النظرية و ما قمنا بعمله في التطبيق ضمن بيئة الماتلاب .
Content based 2Dcerebral digital subtraction angiography(DSA) images retrieval
system has been built. The systemfinds and retrieves images fromcerebral DSA imagedatabase(
Cerebral Sacular Aneurysms) which have a similar content to a query image.
R
etrieval is done by extracting the visual shape features of cerebral saccular aneurysms
from a query image, formulating them in a feature vector, comparing feature vector
components with those of the cerebralDSA images in the database. Similarity measures
using Euclidian distanceare computed,based on the similarity measures, images which
have a similar content to the query image are retrieved. Resolution has been calculated by
finding the ratio between cerebral sacular aneurysm area in first retrieved image to cerebral
sacular aneurysm area in the query image for the eight query process which have been
done, average resolution was 98%. Results indicates that the designed content based image
retrieval could be used to calculate unknown cerebral saccular aneurysms area from a
cerebral saccular aneurysms database images whose areas are known.
This research describes a system for recognition of handwritten
Arabic word without prior segmentation of the word into characters.
In this system, the recognition will be happened at two levels.
It is evolved basing on OCR (Optical Character Reco
gnition),
Hidden Markov Model, CBIR(Content Based Image Retrieval), it
also involves Mathematical Morphology.
The amount of digital images that are produced in hospitals is increasing rapidly. Effective
medical images can play an important role in aiding in diagnosis and treatment, they can
also be useful in the education domain for healthcare students by
explaining with these
images will help them in their studies, new trends for image retrieval using automatic
image classification has been investigated for the past few years. Medical image
Classification can play an important role in diagnostic and teaching purposes in medicine.
For these purposes different imaging modalities are used. There are many classifications
created for medical images using both grey-scale and color medical images. In this paper,
different algorithms in every step involved in medical image processing have been studied.
One way is the algorithms of preprocessing step such as Median filter [1], Histogram
equalization (HE) [2], Dynamic histogram equalization (DHE), and Contrast Limited
Adaptive Histogram Equalization (CLAHE). Second way is the Feature Selection and
Extraction step [3,4], such as Gray Level Co-occurrence Matrix(GLCM). Third way is the
classification techniques step, which is divided into three ways in this paper, first one is
texture classification techniques, second one is neural network classification techniques,
and the third one is K-Nearest Neighbor classification techniques.
In this paper, we have use MRI brain image to determine the area of tumor in brain. The
steps started by preprocessing operation to the image before inputting it to algorithm. The
image was converted to gray scale, later on remove film artifact using special algorithm,
and then remove the Skull portions from the image without effect on white and gray matter
of the brain using another algorithm, After that the image enhanced using optimized
median filter algorithm and remove Impurities that produced from first and second steps.
We present a method for automatic query expansion for cross-lingual information retrieval in the medical domain. The method employs
machine translation of source-language queries into a document language and linear regression to predict the retriev
al performance for each translated query when expanded with a candidate term.
Candidate terms (in the document language) come from multiple sources: query translation hypotheses obtained from the machine translation system, Wikipedia articles and PubMed abstracts. Query expansion is applied only when the model predicts a score for a candidate term that exceeds a tuned threshold which allows to expand queries with strongly related terms only.
Our experiments are conducted using the CLEF eHealth 2013--2015 test collection and show %seven source languages and also in the monolingual case. The results show
significant improvements in both cross-lingual and monolingual settings.
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