Comparison of thallium-201 SPECT redistribution patterns and rubidium-82 PET rest-stress myocardial blood flow imaging

To compare regional thallium-201 SPECT redistribution patterns with rubidium-82 PET, we studied 81 patients with both imaging modalities. Sixty patients had significant coronary artery disease. All patients underwent PET imaging after dipyridamole infusion, while SPECT imaging was performed after exercise stress (38 patients) and dipyridamole (43 patients). Sixty-eight percent of patients with prior infarct had fixed defects on SPECT, compared to 39% with PET. Sixty-one percent of patients with prior infarct had PET perfusion defects which exhibited ‘reflow’ or normal rubidium-82 tracer uptake (p < 0.05 vs. SPECT). Similar results were seen in patients without prior infarct (26% fixed defects on SPECT vs. 12% for PET, p < 0.05). Regional analysis showed that 57% of fixed SPECT defects corresponded to PET defects with reflow or normal rubidium-82 uptake, while 78% of ‘fixed’ PET defects corresponded to fixed SPECT defects. PET reflow and normal rubidium-82 uptake in sites of fixed thallium-201 SPECT perfusion defects suggest that imaging modalities employing separate tracer injections at rest and after stress, such as rubidium-82 PET, may be more specific in the assessment of myocardial viability, especially in patients with prior myocardial infarction.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/42537/1/10554_2005_Article_BF01151577.pd

Модернизация проектного решения участка газотранспортной системы Анивских месторождений от установки подготовки газа Южно-Луговского месторождения до газораспределительного пункта города Анива

Обеспечение эксплуатационной эффективности опасных производственных объектов газотранспортных систем в течение всего их жизненного цикла становится все более сложной задачей организации комплексного мониторинга текущего состояния таких сооружений, оценки их подверженности внешнему воздействию, проведения мер по смягчению и недопущению негативных последствий. В магистерской диссертации произведена количественная оценка ожидаемой вероятности возникновения аварий на газовых сетях и проектируемых сооружениях газораспределительных сетей для своевременного прогнозирования и оптимизации мероприятий по их модернизации.Ensuring the operational efficiency of hazardous production facilities of gas transportation systems throughout their entire service life becomes a formidable challenge associated with coordinating thorough monitoring of such facilities, assessing their exposure, mitigation and sustainability, and taking measures to minimize and prevent negative outcomes. Master's thesis proposes a quantitative assessment of the expected probability of accidents on gas networks and the future facilities of gas distribution networks for timely forecasting and optimization of measures for their improvement