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1	The impact of defective ultrasound transducers on the evaluation results of ultrasound imaging of blood flow / Effekter av defekta ultraljudsgivare på utvärderingsresultaten av ultraljudtester på blodflödet Eghbali, Ladan January 2010 (has links) Following X-Ray, Ultrasound is now the most common of all the medical imaging technologies specifically in obstetrics and cardiology. Plus that the ultrasound hazards perceived to be insignificant compared with X-rays. Considering the fact that the study of cardiovascular diseases, blood flow patterns and the fetal development is essential for human life, the accuracy and proper functioning of ultrasonic systems is of great importance. Hence quality control of ultrasonic transducers is necessary. In this thesis, a system to standardize the acceptance criteria for quality control of ultrasonic transducers is described. On this ground a study on ultrasound images conducted to compare and evaluate the quality resulted from different types of transducers in different conditions, i.e. defective or functional. A clinical study was also carried out to evaluate our hypothesis in real cases at department of Cardiology and department of genecology. Results from this study show that the perception of quality is somewhat subjective and clinical studies are time-consuming. But quality factors such as the ability to accurately identify anatomical structure and functional capabilities are of great importance and help. Ultrasound Doppler Quality Assurance Ultrasound Transducer acceptance criteria image quality defective transducer accurate diagnosis Ultraljud Doppler kvalitetsbedömning kvalitetssäkring transducer acceptanskriterier bildkvalite defekt ultraljudsgivare rätt diagnos rätt behandling Medical Engineering Medicinteknik

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The impact of defective ultrasound transducers on the evaluation results of ultrasound imaging of blood flow / Effekter av defekta ultraljudsgivare på utvärderingsresultaten av ultraljudtester på blodflödet