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Radiofrequency ablation and irreversible electroporation are both interventional procedures used in treating cancer diseases generally and may be used in treatment of liver cancer. The two differ in terms of their action and thermal effects. The present study examined thermal effects of radiofrequency ablation and modified irreversible electroporation ex vivo in porcine liver. Standard radiofrequency...
Purpose. Glioblastoma (GBM) treatment still remains a complex challenge. Among alternatives or adjuvant therapies, photodynamic therapy (5-ALA PDT) appears to be a promising approach. 5-ALA PDT can be delivered intraoperatively, early after tumor resection, or interstitially according to brain tumor location. A treatment planning system was designed to manage dosimetry issues before PDT delivery.Methods...
The exposure index is an important measure used in digital radiography to control the dose at the detector. This value should be computed in regions of interest that are adapted to each patient's anatomy and pose.We propose to define automatically these regions based on anatomical landmarks in the main structures of interest (head, thoracic spine, lungs, lumbar spine, pelvis, femurs, knees, tibiae)...
Purpose: The electrocardiogram (ECG) segmentation step establishes the basis of the cardiac pathologies' classification. We propose here to detect the essential basic forms of this signal to optimize the cost calculation and ensure real-time application.Methods: An automatic approach for R wave's location of the ECG signal based on the Entropy Criterion (EC) of the Wavelet Transform (WT) is introduced...
The rapid growth of digital technology in medical fields over recent years has increased the need for applications able to manage patient medical records, imaging data, and chart information. Web-based applications are implemented with the purpose to link digital databases, storage and transmission protocols, management of large volumes of data and security concepts, allowing the possibility to read,...
Anterior cruciate ligament (ACL), a structure involved in providing knee stability, is an important restraint for anterior tibial translation and secondary restraint for internal tibial rotation. Injury to ACL, leading to its rupture can cause a lot of problems such as effect on knee stability, cartilage wear and other joint structures. Understanding the anatomy, physiology and the mechanical behavior...
Electroencephalogram (EEG) is a record of brain electrical activities along the scalp which contains precious information related to different brain states. The aim of this study is to investigate the complexity of EEG signals and distinguish the EEG signals with different rhythm.The EEG time series data used in this study come from single neural mass model. The model with the different parameters...
The reconstruction of large mandibular defects using commercial available reconstruction plates often leads to complications. The application of computer aided design technologies together with advanced medical imaging (CT/MRI) is gaining increased attention in reconstructive surgeries. Studies have proved that implants with porous structures can effectively enhances the biological fixation of the...
AimsThe liver CT image segmentation is still until now a challenging problem due to the fuzzy nature of the tumor transition to the surrounding tissues. The objective of this article is the consideration of the uncertainty present around the boundaries of a tumor region in the segmentation of the liver CT images as well as the segmentation of multiple tumors in the same CT image.Materials and methodsA...
This work introduces a new procedure to highlight helitron structures in the C. elegans DNA sequences. In this sense, the DNA strings are converted to numerical representations either in one or two dimensions. As a one dimensional coding, we choose the Frequency Chaos Game Signal (FCGS) which encodes the DNA based on the Chaos Game theory. Afterwards, a time–frequency representation – generated by...
Background: Synchronization can measure the interaction between different brain regions, but how alcoholics and non-alcoholic subjects differ in synchronization is still not fully clear.Methods: The synchronization analyses in present study on EEG synchronization are almost all based on the scalp EEG data. However, due to the volume conductor effect, there may be pseudo relevance between the scalp...
Cardiovascular disease remains the leading cause of death affecting the adult population. It involves disorders of myocardial perfusion which can lead to the disturbance in myocardial function and/or myocardial infarction. Finding an efficient method for the deformation analysis in the left ventricle of the heart (LV) is one of the major concerns in cardiac imaging.In literature, most models provide...
Magnetoencephalography (MEG) provides a promising, non-invasive medium for characterizing high temporal brain dynamics and functional connectivity (FC) networks. MEG based studies often include a source space signal reconstruction from the sensor data. However, spatial filters or inverse solutions that are used for source signal reconstruction induce a linear interaction between the source signals,...
Arrhythmia is the disturbance in the heart's regular rhythmic activity. Although arrhythmia signals are generally reflected on electrocardiogram records, some arrhythmias do not continuously appear. In such cases, heart-rate variability signals may have to be obtained over long periods of time and should be inspected by experts. However, analyses by experts require a long time and may omit important...
Selective Internal Radiation Therapy is an emerging, minimally invasive therapy of liver cancer. Millions of microspheres are injected through a catheter into tumor vascular supply. Microspheres distribution in liver is strongly dependent on patient's arteries geometry and catheter tip positioning, which is currently chosen by the physician based on qualitative image interpretation. A patient-specific...
X-ray angiography is the most used tool by clinician to diagnose the majority of cardiovascular disease and deformations in coronary arteries like stenosis. In most applications involving angiograms interpretation, accurate segmentation is essential to extract the coronary artery tree and thus speed up the medical intervention.In this paper, we propose a multiscale algorithm based on Graph cuts for...
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