Todor Petkov

Learn More
PURPOSE The authors presented a novel system for automated nodule detection in lung CT exams. METHODS The approach is based on (1) a lung tissue segmentation preprocessing step, composed of histogram thresholding, seeded region growing, and mathematical morphology; (2) a filtering step, whose aim is the preliminary detection of candidate nodules (via 3D(More)
Drug hypersensitivity syndrome (DHS) is believed to be an adverse idiosyncratic drug reaction associated mainly with administration of aromatic antiepileptic drugs, such as phenytoin, carbamazepine, phenobarbital, lamotrigine. The syndrome is defined by the clinical triad of fever, skin rash and internal organ involvement and can be life-threatening(More)
A novel approach to the detection of masses and clustered microcalcification is presented. Lesion detection is considered as a two-class pattern recognition problem. In order to get an effective and stable representation, the detection scheme codifies the image by using a ranklet transform. The vectors of ranklet coefficients obtained are classified by(More)
This paper describes the process of encrypting message in a sound using artificial neural network. In order to accomplish the task, the process is divided into several steps where each of the steps is described with Generalized net. The main goal is to send an encrypted in a sound message between two persons and if a wrong person receives it he will not be(More)
The birth of hypotrophic piglets with 2-3 times lower live weight than the normally born ones, which die till the 40th hour, because of the abruptly decreased vitality is described. Their percent is 7 for the reproductive bases and 10 for a commodity swine breeding complex. Studies were carried out on 402 pregnant pigs, treated with protein hydrolysate and(More)
OBJECTIVES Ducks can shed and spread influenza A viruses (IAVs) while showing no disease signs. Our objective was to clarify the role of 'foie gras' ducks in the circulation of IAVs in Bulgaria. METHODS Monthly avian influenza surveillance was conducted on 63 'foie gras' duck farms, 52 of which were surveyed throughout the study between November 2008 and(More)
  • 1