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The study of QT/RR relationship is important for the clinical evaluation of possible risk of ventricular tachyarrhythmia. Our aim was to assess the effects of 5-days of head-down (−6 degrees) bed-rest (HDBR) on ventricular repolarization. High fidelity 12-leads Holter ECG was acquired before (PRE), the last day of HDBR (HDT5), and five days after its conclusion (POST). X, Y, Z leads were derived (inverse...
There are evidences suggesting that spaceflight may be associated with increased susceptibility to ventricular dysrhythmias. To explore this hypothesis, five days −6° head-down bed rest (HDBR) was performed with the aim at testing the changes in QT/RR dynamics. Electrocardiogram signals (ECG) was acquired in 22 males during tilt-tests performed before and after HDBR. The dynamics of QT interval adaptation...
This paper describes an automatic technique for the segmentation, detection and quantification of bacilli and clusters present in a digital image of sputum smear samples prepared with the Ziehl-Neelsen technique. Algorithms for color space segmentation, quantification and automatic diagnosis are described. Different color spaces (RGB, HSV,YIQ, YCbCr, Lab) were considered in order to develop and algorithm...
DNA gels analysis plays an important role in genetic of populations and genetic disorders diagnosis studies. The main purpose of this procedure is to determine the size(measured in base pairs) of every DNA fragment present in the gel. This paper describes a procedure, based on digital image processing techniques, that leads to lanes segmentation and bands detection on the digital image, with help...
Sperm morphology has a key role in the determination of fertility in men. Nowadays assessments of sperm morphology are mostly done with subjective criteria. This article discusses details of the stages implemented in a computer aided tool for the objective analysis of human sperm morphology, commonly known as Automated Sperm Morphology Analyzer (ASMA). The first stage described is the detection and...
Sperm morphology has a key role in the determination of fertility in men. Nowadays assessments of sperm morphology are mostly done based on subjective criteria. This article discusses details of the image processing algorithms implemented in a computer aided tool for the objective analysis of human sperm morphology, commonly known as automated sperm morphology analyzer (ASMA). The first stage described...
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