دانلود رایگان مقاله پیش بینی موقعیت نسبی برشCT با سیستم هوش محاسباتی

عنوان فارسی
پیش بینی موقعیت نسبی برشCT با استفاده از سیستم هوش محاسباتی
عنوان انگلیسی
Prediction of relative position of CT slices using a computational intelligence system
صفحات مقاله فارسی
0
صفحات مقاله انگلیسی
9
سال انتشار
2015
نشریه
الزویر - Elsevier
فرمت مقاله انگلیسی
PDF
کد محصول
E315
رشته های مرتبط با این مقاله
مهندسی کامپیوتر و مهندسی برق
گرایش های مرتبط با این مقاله
برنامه نویسی کامپیوتری، برق قدرت و سیستمهای قدرت
مجله
محاسبات نرم کاربردی - Applied Soft Computing
دانشگاه
دانشگاه لیوبلیانا، دانشکده اقتصاد، اسلوونی
کلمات کلیدی
سی تی اسکن، رادیولوژی، برنامه نویسی ژنتیک، معناشناسی، جستجوی محلی
۰.۰ (بدون امتیاز)
امتیاز دهید
چکیده

Abstract


One of the most common techniques in radiology is the computerized tomography (CT) scan. Automatically determining the relative position of a single CT slice within the human body can be very useful. It can allow for an efficient retrieval of slices from the same body region taken in other volume scans and provide useful information to the non-expert user. This work addresses the problem of determining which portion of the body is shown by a stack of axial CT image slices. To tackle this problem, this work proposes a computational intelligence system that combines semantics-based operators for Genetic Programming with a local search algorithm, coupling the exploration ability of the former with the exploitation ability of the latter. This allows the search process to quickly converge towards (near-)optimal solutions. Experimental results, using a large database of CT images, have confirmed the suitability of the proposed system for the prediction of the relative position of a CT slice. In particular, the new method achieves a median localization error of 3.4 cm on unseen data, outperforming standard Genetic Programming and other techniques that have been applied to the same dataset. In summary, this paper makes two contributions: (i) in the radiology domain, the proposed system outperforms current state-of-the-art techniques; (ii) from the computational intelligence perspective, the results show that including a local searcher in Geometric Semantic Genetic Programming can speed up convergence without degrading test performance.

نتیجه گیری

4. Conclusions


This paper proposes a computational intelligence system to automatically determine the relative position of a single CT slice within a full body scan. Knowing the relative position in a scan allows the efficient retrieval of similar slices from the same body region in other volume scans. Moreover, the relative position is often important information for a non-expert user that only has access to a single CT slice of a scan. The proposed system is based on a variant of GP. In particular, the GP system makes use of particular genetic operators that, differently from the standard genetic operators used in GP, work on the semantics ofthe solutions.While the use of semantic methods in GP has been successfully investigated and applied, several important problems that do not allow to efficiently use these methods are still open. In particular, the GP system that uses semantics operators (GSGP) requires a large amount of generations to converge towards optimal solutions. In this perspective,this work integrated the GSGP framework with a local search optimizer. The use of a local searcher improved the convergence speed of GSGP, while not overfitting the training data. That is, by combining the exploration ability of GSGP with the exploitation ability of a local search method the proposed system outperformed state-of-the-art performance. Experimental results, achieved using a large database of CT images, have shown the suitability of the proposed system for the studied problem. In particular, the new method provides a median localization error of 3.4 cm on unseen data, outperforming standard GP, the basic GSGP algorithm and all other existing state-of-the-art techniques for this application.


بدون دیدگاه