Search for dissertations about: "portal imaging device"

Showing result 1 - 5 of 57 swedish dissertations containing the words portal imaging device.

  2. 1. Colorimetric and Multispectral Image Acquisition

    Author : Daniel Nyström; Björn Kruse; Carl-Magnus Fahlcrantz; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Color imaging; Multispectral imaging; Spectral reconstruction; Device characterization; Image analysis; Bildanalys;

    Abstract : The trichromatic principle of representing color has for a long time been dominating in color imaging. The reason is the trichromatic nature of human color vision, but as the characteristics of typical color imaging devices are different from those of human eyes, there is a need to go beyond the trichromatic approach. READ MORE

  4. 2. New Efficient Detector for Radiation Therapy Imaging using Gas Electron Multipliers

    Author : Janina Östling; Mats Danielsson; Anders Brahme; Fabio Sauli; Stockholms universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Portal imaging; Gas Electron Multiplier; Gas detector; Medical engineering; Medicinsk teknik;

    Abstract : Currently film is being replaced by electronic detectors for portal imaging in radiation therapy. This development offers obvious advantages such as on-line quality assurance and digital images that can easily be accessed, processed and communicated. READ MORE

  5. 3. High Resolution Analysis of Halftone Prints : A Colorimetric and Multispectral Study

    Author : Daniel Nyström; Björn Kruse; Markku Hauta- Kasari; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Color imaging; Multispectral imaging; Halftone print; Dot gain; Image analysis; Bildanalys;

    Abstract : To reproduce color images in print, the continuous tone image is first transformed into a binary halftone image, producing various colors by discrete dots with varying area coverage. In halftone prints on paper, physical and optical dot gains generally occur, making the print look darker than expected, and making the modeling of halftone color reproduction a challenge. READ MORE

  6. 4. Quantifying image quality in diagnostic radiology using simulation of the imaging system and model observers

    Author : Gustaf Ullman; Michael Sandborg; Gudrun Alm Carlsson; Nicolas Pallikarakis; Linköpings universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; radiology; radiation physics; image quality; optimisation; effective dose; chest radiography; Radiological physics; Radiofysik;

    Abstract : Accurate measures of both clinical image quality and patient radiation risk are needed for successful optimisation of medical imaging with ionising radiation. Optimisation in diagnostic radiology means finding the image acquisition technique that maximises the perceived information content and minimises the radiation risk or keeps it at a reasonably low level. READ MORE

  7. 5. Microwell devices for single-cell analyses

    Author : Sara Lindström; Helene Andersson-Svahn; Mehmet Toner; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; microwell; miniaturization; microfluidics; cell culture; single-cell; clone; imaging; stem cell; cancer; low volume; high-throughput; Molecular biology; Molekylärbiologi;

    Abstract : Powerful tools for detailed cellular studies are emerging, increasing the knowledge ofthe ultimate target of all drugs: the living cell. Today, cells are commonly analyzed inensembles, i.e. thousands of cells per sample, yielding results on the average responseof the cells. READ MORE