INTEGRASI FUZZY C-MEANS DAN METODE LEVEL SET UNTUK OTOMATISASI SEGMENTASI CITRA MEDIS

Segmentasi pada citra medis, seperti X-Rays, Magnetic Resonance (MR), Computer Tomography  (CT), Positron Emission Tomography (PET), dan lain-lain merupakan langkah awal yang penting dan sangat menentukan proses analisis data medis dalam visualisasi data pasien dan sebagai panduan dalam operasi.Masalah segmentasi  citra medis menjadi sulit, ketika citra yang di proses memiliki resolusi rendah ,kontras yang lemah, dan memiliki banyak noise.Pada penelitian ini penulis mengusulkan Integrasi Metode Fuzzy C-Means untuk otomatisasi penentuan parameter pada metode level set sehingga dapat  di gunakan  untuk segmentasi citra medis secara universal. Data awal diolah dengan menggunakan FCM untuk mendapatkan pusat cluster, dari data image fcm yang didapatkan kemudian proses segmentasi dilanjutkan dengan menggunakan metode level set  untuk mendapatkan segmentasi yang lebih baik.Kinerja metode segmentasi citra medis dengan menggunakan metode ini meningkat dengan data pengukuran hasil experimen adalah Accuracy 97.99, Precission 95.47, Recall 95.20, AUC 0.96 ( excellent classification), Kappa 0.94 (Almost Perfect / perfect) dan RMSE 0.14. Selain itu Metode yang diusulkan juga mampu mempersingkat waktu pemrosesan untuk melakukan segmentasi citra medis. Kata kunci: citra medis, Fuzzy C- Means, metode level set, segmentas

Multi-Phase Three-Dimensional Level Set Segmentation of Brain MRI

Segmentation of cortical structures on clinical brain MRI data is applied for clinical study of depression on elderly subjects. Segmentation of clinical MRI data is more challenging than with simulated data due to intensity overlap among cortical structures and non-homogeneity within each tissue

Homogeneity Measures for Multiphase Level Set Segmentation of Brain MRI

This paper presents a new homogeneity measure for variational segmentation with multiple level set functions. We propose to modify the quadratic homogeneity measure to trade off the convexity of the function against a faster rate of convergence. We tested in two series of experiments the performance of this new homogeneity force at converging to appropriate partitioning of brain MRI data sets, over a large range of image spatial resolution and image quality, in terms of tissue homogeneity and contrast

An Automatic Level Set Based Liver Segmentation from MRI Data Sets

A fast and accurate liver segmentation method is a challenging work in medical image analysis area. Liver segmentation is an important process for computer-assisted diagnosis, pre-evaluation of liver transplantation and therapy planning of liver tumors. There are several advantages of magnetic resonance imaging such as free form ionizing radiation and good contrast visualization of soft tissue. Also, innovations in recent technology and image acquisition techniques have made magnetic resonance imaging a major tool in modern medicine. However, the use of magnetic resonance images for liver segmentation has been slow when we compare applications with the central nervous systems and musculoskeletal. The reasons are irregular shape, size and position of the liver, contrast agent effects and similarities of the gray values of neighbor organs. Therefore, in this study, we present a fully automatic liver segmentation method by using an approximation of the level set based contour evolution from T2 weighted magnetic resonance data sets. The method avoids solving partial differential equations and applies only integer operations with a two-cycle segmentation algorithm. The efficiency of the proposed approach is achieved by applying the algorithm to all slices with a constant number of iteration and performing the contour evolution without any user defined initial contour. The obtained results are evaluated with four different similarity measures and they show that the automatic segmentation approach gives successful results

Active Contours and Image Segmentation: The Current State Of the Art

Image segmentation is a fundamental task in image analysis responsible for partitioning an image into multiple sub-regions based on a desired feature. Active contours have been widely used as attractive image segmentation methods because they always produce sub-regions with continuous boundaries, while the kernel-based edge detection methods, e.g. Sobel edge detectors, often produce discontinuous boundaries. The use of level set theory has provided more flexibility and convenience in the implementation of active contours. However, traditional edge-based active contour models have been applicable to only relatively simple images whose sub-regions are uniform without internal edges. Here in this paper we attempt to brief the taxonomy and current state of the art in Image segmentation and usage of Active Contours

Aberrant crypt Foci segmentation using computational vision

Colorectal cancer is a type of cancer that develops in the large intestine (colon) orthe rectum, one of the most common malignancies in the world. In this context, the aberrantcrypt foci may have a crucial and decisive role. The aberrant crypt foci are supposed to be theprecursors of colorectal cancer. This works aimed to develop computational methodologies forthe detection and segmentation of aberrant crypt foci in endoscopy images

Statistical region-based active contours with exponential family observations

International audienceIn this paper, we focus on statistical region-based active contour models where image features (e.g. intensity) are random variables whose distribution belongs to some parametric family (e.g. exponential) rather than confining ourselves to the special Gaussian case. Using shape derivation tools, our effort focuses on constructing a general expression for the derivative of the energy (with respect to a domain) and derive the corresponding evolution speed. A general result is stated within the framework of multi-parameter exponential family. More particularly, when using Maximum Likelihood estimators, the evolution speed has a closed-form expression that depends simply on the probability density function, while complicating additive terms appear when using other estimators, e.g. momentsmethod. Experimental results on both synthesized and real images demonstrate the applicability of our approach

Statistical region-based active contours with exponential family observations

In this paper, we focus on statistical region-based active contour models where image features (e.g. intensity) are random variables whose distribution belongs to some parametric family (e.g. exponential) rather than confining ourselves to the special Gaussian case. Using shape derivation tools, our effort focuses on constructing a general expression for the derivative of the energy (with respect to a domain) and derive the corresponding evolution speed. A general result is stated within the framework of multi-parameter exponential family. More particularly, when using Maximum Likelihood estimators, the evolution speed has a closed-form expression that depends simply on the probability density function, while complicating additive terms appear when using other estimators, e.g. moments method. Experimental results on both synthesized and real images demonstrate the applicability of our approach.Comment: 4 pages, ICASSP 200