Search for dissertations about: "DOSE index"

Showing result 21 - 25 of 129 swedish dissertations containing the words DOSE index.

  2. 21. Optimization of paediatric CT examinations - An approach to minimize absorbed dose to patients with regard to image quality and observer variability

    Author : Kerstin Ledenius; Göteborgs universitet; []
    Keywords : Computed Tomography; Paediatrics; Radiation Dosage; Computer Simulations; Nonparametric Statistics; Observer Variation; Radiographic Image Enhancement;

    Abstract : The absorbed dose to paediatric patients is important bearing in mind the increased risk of radiation-induced cancer due to exposure to X-rays at young ages. Questions have also been raised of whether a CT examination of the paediatric brain might lead to a reduction in cognitive function. READ MORE

  4. 22. Development and repair of cataract induced by ultraviolet radiation

    Author : Ralph Michael; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ultraviolet radiation; cataract; forward light scattering; lens ultrastructure; refractive index; dose-response; repeated exposure; apoptosis; in vivo; rat;

    Abstract : Background: Several epidemiological investigations show a correlation between cataract development and the dose of ultraviolet radiation (UVR) received. It is experimentally well established that exposure of animal eyes to UVR induces cataract. Most cataracts develop as a gradual increase in lens opacity. READ MORE

  5. 23. Novel neurophysiological monitors of the transition from wakefulness to loss of consciousness during anaesthesia

    Author : Gunilla Barr; Karolinska Institutet; Karolinska Institutet; []
    Keywords : EEG; BI-spectral index; AEP; propofol; sevoflurane; awareness;

    Abstract : Background: The concept of adequate anaesthesia is not easily defined. One important component of anaesthesia is the suppression of wakefulness, that is, a patient who does not experience sensory input such as hearing, vision, and feeling of pain. READ MORE

  6. 24. Etiology of gastroesophageal reflux

    Author : Magnus Nilsson; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Gastroesophageal reflux; esophagitis; etiology; risk factors; population-based; casecontrol study; prevalence; body mass index; hormone replacement therapy; life-style;

    Abstract : Although gastroesophageal reflux disease is among the most common disorders at all in Western populations, the etiology is largely unknown. The objective of this thesis is to increase the knowledge of the etiology of reflux disease by studying a number of potential risk factors, using population-based methods. READ MORE

  7. 25. Spectral Mammography with X-Ray Optics and a Photon-Counting Detector

    Author : Erik Fredenberg; Mats Danielsson; Björn Cederström; Jeffrey H. Siewerdsen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; mammography; x-ray optics; photon counting; spectral shaping; spectral imaging; collimation; radiation dose; signal-to-noise ratio; quantum noise; anatomical noise; spatial resolution; x-ray flux; ; TECHNOLOGY; TEKNIKVETENSKAP; Engineering physics; Teknisk fysik; Optical physics; Optisk fysik; Other engineering physics; Övrig teknisk fysik; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik; Medical engineering; Medicinsk teknik; Radiological research; Radiologisk forskning;

    Abstract : Early detection is vital to successfully treating breast cancer, and mammography screening is the most efficient and wide-spread method to reach this goal. Imaging low-contrast targets, while minimizing the radiation exposure to a large population is, however, a major challenge. READ MORE