371 research outputs found
APPLICATION OF FUZZY-MLP MODEL TO ULTRASONIC LIVER IMAGE CLASSIFICATION
In this paper, we propose the application of fuzzy-MLP in theclassification of ultrasonic liver images. The four sets of ultrasonic liverimages used in the experiment are: normal, liver cysts, alcoholic cirrhosisand carcinoma.To deal with the sample images efficiently, we extract textural features fromthe Pathology Bearing Regions (PBRs) of the ultrasound liver images. Theselected features for the classification are entropy, energy and maximumprobability-based texture features extracted using gray level co-occurrencematrix second-order statistics. The fuzzy-MLP model is constructed for theselected features classify various categories of ultrasonic liver images.The efficacy of Fuzzy-MLP model and conventional artificial neural network(ANN) has been compared on the basis of the same feature vector. A testwith 82 training data and 110 test data for all the four classes shows 92.73%classification accuracy for the proposed fuzzy-MLP model. It is comparedwith the 81.82% counterpart provided by conventional ANN method
Data mining framework for fatty liver disease classification in ultrasound: a hybrid feature extraction paradigm
PURPOSE: Fatty liver disease (FLD) is an increasing prevalent disease that can be reversed if detected early. Ultrasound is the safest and ubiquitous method for identifying FLD. Since expert sonographers are required to accurately interpret the liver ultrasound images, lack of the same will result in interobserver variability. For more objective interpretation, high accuracy, and quick second opinions, computer aided diagnostic (CAD) techniques may be exploited. The purpose of this work is to develop one such CAD technique for accurate classification of normal livers and abnormal livers affected by FLD. METHODS: In this paper, the authors present a CAD technique (called Symtosis) that uses a novel combination of significant features based on the texture, wavelet transform, and higher order spectra of the liver ultrasound images in various supervised learning-based classifiers in order to determine parameters that classify normal and FLD-affected abnormal livers. RESULTS: On evaluating the proposed technique on a database of 58 abnormal and 42 normal liver ultrasound images, the authors were able to achieve a high classification accuracy of 93.3% using the decision tree classifier. CONCLUSIONS: This high accuracy added to the completely automated classification procedure makes the authors' proposed technique highly suitable for clinical deployment and usage
Radiomics analysis in gastrointestinal imaging: a narrative review
Background and Objective: To present an overview of radiomics radiological applications in major
gastrointestinal oncological non-oncologic diseases, such as colorectal cancer, pancreatic cancer, gastro-
oesophageal cancer, gastrointestinal stromal tumor (GIST), hepatocellular carcinoma (HCC), intrahepatic
cholangiocarcinoma (ICC), and non-oncologic diseases, such as liver fibrosis, nonalcoholic steatohepatitis,
and inflammatory bowel disease.
Methods: A search of PubMed databases was performed for the terms “radiomic”, “radiomics”, “liver”,
“small bowel”, “colon”, “GI tract”, and “gastrointestinal imaging” for English articles published between
January 2013 and July 2022. A narrative review was undertaken to summarize literature pertaining to
application of radiomics in major oncological and non-oncological gastrointestinal diseases. The strengths
and limitation of radiomics, as well as advantages and major limitations and providing considerations for
future development of radiomics were discussed.
Key Content and Findings: Radiomics consists in extracting and analyzing a vast amount of quantitative
features from medical datasets, Radiomics refers to the extraction and analysis of large amounts of
quantitative features from medical images. The extraction of these data, integrated with clinical data, allows
the construction of descriptive and predictive models that can build disease-specific radiomic signatures.
Texture analysis has emerged as one of the most important biomarkers able to assess tumor heterogeneity
and can provide microscopic image information that cannot be identified with the naked eye by radiologists.
Conclusions: Radiomics and texture analysis are currently under active investigation in several institutions
worldwide, this approach is being tested in a multitude of anatomical areas and diseases, with the final aim
to exploit personalized medicine in diagnosis, treatment planning, and prediction of outcomes. Despite
promising initial results, the implementation of radiomics is still hampered by some limitations related to the
lack of standardization and validation of image acquisition protocols, feature segmentation, data extraction,
processing, and analysi
Medical imaging analysis with artificial neural networks
Given that neural networks have been widely reported in the research community of medical imaging, we provide a focused literature survey on recent neural network developments in computer-aided diagnosis, medical image segmentation and edge detection towards visual content analysis, and medical image registration for its pre-processing and post-processing, with the aims of increasing awareness of how neural networks can be applied to these areas and to provide a foundation for further research and practical development. Representative techniques and algorithms are explained in detail to provide inspiring examples illustrating: (i) how a known neural network with fixed structure and training procedure could be applied to resolve a medical imaging problem; (ii) how medical images could be analysed, processed, and characterised by neural networks; and (iii) how neural networks could be expanded further to resolve problems relevant to medical imaging. In the concluding section, a highlight of comparisons among many neural network applications is included to provide a global view on computational intelligence with neural networks in medical imaging
State of the Art in Artificial Intelligence and Radiomics in Hepatocellular Carcinoma
The most common liver malignancy is hepatocellular carcinoma (HCC), which is also associated with high mortality. Often HCC develops in a chronic liver disease setting, and early diagnosis as well as accurate screening of high-risk patients is crucial for appropriate and effective management of these patients. While imaging characteristics of HCC are well-defined in the diagnostic phase, challenging cases still occur, and current prognostic and predictive models are limited in their accuracy. Radiomics and machine learning (ML) offer new tools to address these issues and may lead to scientific breakthroughs with the potential to impact clinical practice and improve patient outcomes. In this review, we will present an overview of these technologies in the setting of HCC imaging across different modalities and a range of applications. These include lesion segmentation, diagnosis, prognostic modeling and prediction of treatment response. Finally, limitations preventing clinical application of radiomics and ML at the present time are discussed, together with necessary future developments to bring the field forward and outside of a purely academic endeavor
Texture Analysis in Magnetic Resonance Imaging: Review and Considerations for Future Applications
Texture analysis is a technique used for the quantification of image texture. It has been successfully used in many fields, and in the past years it has been applied in magnetic resonance imaging (MRI) as a computer-aided diagnostic tool. Quantification of the intrinsic heterogeneity of different tissues and lesions is necessary as they are usually imperceptible to the human eye. In the present chapter, we describe texture analysis as a process consisting of six steps: MRI acquisition, region of interest (ROI) definition, ROI preprocessing, feature extraction, feature selection, and classification. There is a great variety of methods and techniques to be chosen at each step and all of them can somehow affect the outcome of the texture analysis application. We reviewed the literature regarding texture analysis in clinical MRI focusing on the important considerations to be taken at each step of the process in order to obtain maximum benefits and to avoid misleading results
MR Imaging Texture Analysis in the Abdomen and Pelvis
Texture analysis (TA) is a form of radiomics and refers to quantitative measurements of the
histogram, distribution and/or relationship of pixel intensities or gray scales within a region of
interest on an image. TA can be applied to MRI of the abdomen and pelvis, with the main
strength being quantitative analysis of pixel intensities and heterogeneity rather than
subjective/qualitative analysis. There are multiple limitations of MR texture analysis (MRTA)
including a dependency on image acquisition and reconstruction parameters, non-standardized
approaches without or with image filtration, diverse software methods and applications, and
statistical challenges relating numerous texture analysis results to clinical outcomes in
retrospective pilot studies with small sample sizes. Despite these limitations, there is a growing
body of literature supporting MRTA. In this review, the application of MRTA to the abdomen
and pelvis will be discussed, including tissue or tumor characterization and response evaluation
or prediction of outcomes in various tumors
Computer-Assisted Algorithms for Ultrasound Imaging Systems
Ultrasound imaging works on the principle of transmitting ultrasound waves into the body and
reconstructs the images of internal organs based on the strength of the echoes. Ultrasound imaging
is considered to be safer, economical and can image the organs in real-time, which makes it widely
used diagnostic imaging modality in health-care. Ultrasound imaging covers the broad spectrum
of medical diagnostics; these include diagnosis of kidney, liver, pancreas, fetal monitoring, etc.
Currently, the diagnosis through ultrasound scanning is clinic-centered, and the patients who are
in need of ultrasound scanning has to visit the hospitals for getting the diagnosis. The services of
an ultrasound system are constrained to hospitals and did not translate to its potential in remote
health-care and point-of-care diagnostics due to its high form factor, shortage of sonographers, low
signal to noise ratio, high diagnostic subjectivity, etc. In this thesis, we address these issues with an
objective of making ultrasound imaging more reliable to use in point-of-care and remote health-care
applications. To achieve the goal, we propose (i) computer-assisted algorithms to improve diagnostic
accuracy and assist semi-skilled persons in scanning, (ii) speckle suppression algorithms to improve
the diagnostic quality of ultrasound image, (iii) a reliable telesonography framework to address
the shortage of sonographers, and (iv) a programmable portable ultrasound scanner to operate in
point-of-care and remote health-care applications
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