Hygienic evaluation of objects concerning extraction, preparation and primary processing of oil, considering health risk parameters.

The authors presented results of hygienic evaluation of ambient air quality in area influenced by oil extraction wells, primary oil processing devices, squeeze stations and other oil extraction objects, using criteria - adherence to hygienic requirements and allowable risk levels for public health. Findings are that due to substantial technologic, organizational changes and innovations in oil extraction industry chamicals content of air at MAC levels and allowable levels of inhalation risk in acute and chronic exposure for majority of the objects studied are reached on considerably shorter distances from industrial area, than it is preset by actual sanitary rules and regulations. Levels of hygienic safety at the objects indicate possible revision of sanitary classification toward reducing the size of approximate sanitary protective zones.

[Comparative evaluation of the efficiency of different magnetic resonance imaging procedures in the recognition of local recurrence of prostate cancer: preliminary results].

The paper considers the role of different procedures of magnetic resonance imaging (MRI) of a local recurrence of the disease in patients undergoing radical prostatectomy (RPE) for prostate cancer (PC). A study group comprised 12 patients who had developed a biochemical recurrence with no evidence of systemic progression of the disease in different periods after RPE. All the patients underwent multiphase MRI using T1-T2-weighted, diffusion-weighted, and postcontrast images.

Calculation of the liquor system pliability using the mathematical simulation method.

Liquor circulation is a directed flow of the liquor from sites of its secretion to sites of resorption. This slow flow is modulated by pulsation caused by heart work. Phase-contrast magnetic resonance imaging is a method for noninvasive measurements of the linear velocity of these pulses in the cerebral aqueduct.

New aspects of technical testing of intravascular stents.

Maximum magnetic resonance artifacts from stents are often determined by the presence of ferromagnetic compounds in the delivery system. We propose a mathematic model describing artifacts caused by nitinol stents. A method for evaluation of critical radial rigidity of the stents was developed.