Publications by authors named "Joao Otavio Bandeira Diniz"

Background: Liver segmentation is a fundamental step in the treatment planning and diagnosis of liver cancer. However, manual segmentation of liver is time-consuming because of the large slice quantity and subjectiveness associated with the specialist's experience, which can lead to segmentation errors. Thus, the segmentation process can be automated using computational methods for better time efficiency and accuracy.

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The COVID-19 pandemic, which originated in December 2019 in the city of Wuhan, China, continues to have a devastating effect on the health and well-being of the global population. Currently, approximately 8.8 million people have already been infected and more than 465,740 people have died worldwide.

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Background And Objective: One of the main steps in the planning of radiotherapy (RT) is the segmentation of organs at risk (OARs) in Computed Tomography (CT). The esophagus is one of the most difficult OARs to segment. The boundaries between the esophagus and other surrounding tissues are not well-defined, and it is presented in several slices of the CT.

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Background: The precise segmentation of kidneys and kidney tumors can help medical specialists to diagnose diseases and improve treatment planning, which is highly required in clinical practice. Manual segmentation of the kidneys is extremely time-consuming and prone to variability between different specialists due to their heterogeneity. Because of this hard work, computational techniques, such as deep convolutional neural networks, have become popular in kidney segmentation tasks to assist in the early diagnosis of kidney tumors.

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Background And Objective: Chest X-ray (CXR) is one of the most used imaging techniques for detection and diagnosis of pulmonary diseases. A critical component in any computer-aided system, for either detection or diagnosis in digital CXR, is the automatic segmentation of the lung field. One of the main challenges inherent to this task is to include in the segmentation the lung regions overlapped by dense abnormalities, also known as opacities, which can be caused by diseases such as tuberculosis and pneumonia.

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  • * The proposed methodology uses advanced techniques like adaptive template matching, IMSLIC, and convolutional neural networks to automate the detection of the spinal cord in CT images, reducing human error and making the process more efficient.
  • * Testing on 36 CT images showed high accuracy (92.55%), specificity (92.87%), and sensitivity (89.23%) for spinal cord detection, indicating that this computational approach is effective for treatment planning in radiotherapy.
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Lung cancer is the type of cancer that most often kills after the initial diagnosis. To aid the specialist in its diagnosis, temporal evaluation is a potential tool for analyzing indeterminate lesions, which may be benign or malignant, during treatment. With this goal in mind, a methodology is herein proposed for the analysis, quantification, and visualization of changes in lung lesions.

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  • White matter lesions, common in the elderly, can indicate various brain diseases, making early detection crucial, and MRI is a key tool for this due to its detailed imaging capabilities.
  • The proposed computational methodology to detect white matter lesions in MRI involves four steps: image acquisition, preprocessing, segmentation, and classification using SLIC0 clustering and convolutional neural networks.
  • The methodology showed impressive results with an accuracy of 98.73% and very low false positives, demonstrating its effectiveness for analyzing brain MRI scans.
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  • * It utilizes the DDSM database and includes a two-phase methodology: training (classifying breast tissue and regions) and testing (involves various preprocessing steps and false positive reductions).
  • * The results indicate high accuracy rates, with over 95% in classifying breast tissue and strong sensitivity and specificity in detecting mass regions, demonstrating the effectiveness of the proposed method.
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