Sökning: "image quality criteria"

Visar resultat 1 - 5 av 27 avhandlingar innehållade orden image quality criteria.

  1. 1. Evaluation of absorbed dose and image quality in mammography

    Författare :Bengt Hemdal; [2009]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; optically stimulated luminescence; radioluminescence; in vivo dosimetry; dose reduction; dose protocol; average glandular dose; absorbed dose; Breast cancer; mammography; Monte Carlo; image quality; image quality criteria; contrast-detail phantom;

    Sammanfattning : Mammography refers to the X-ray examination of the human breast, and is considered the single most important diagnostic tool in the early detection of breast cancer, which is by far the most common cancer among women. There is good evidence from clinical trials, that mammographic screening can reduce the breast cancer mortality with about 30%. LÄS MER

  2. 2. Towards Automatic Image Analysis for Computerised Mammography

    Detta är en avhandling från Umeå : Datavetenskap

    Författare :Christina Olsén; Frank Drewes; Fredrik Georgsson; Gunilla Borgefors; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computer Aided Diagnosis; Quality Assessment; Image Analysis; Ground Truth Assessment; Artificial Intelligence; Measurements; Segmentation Evaluation; Performance Measures; Pattern Recognition; Validation; Decision Support; Medicine; TECHNOLOGY Information technology Computer science; TEKNIKVETENSKAP Informationsteknik Datavetenskap;

    Sammanfattning : Mammographic screening is an effective way to detect breast cancer. Early detection of breast cancer depends to a high degree on the adequacy of the mammogram from which the diagnosis is made. Today, most of the analysis of the mammogram is performed by radiologists. LÄS MER

  3. 3. Quantifying the quality of medical x-ray images. An evaluation based on normal anatomy for lumbar spine and chest radiography

    Detta är en avhandling från Department of Radiation Physics, Lund university

    Författare :Anders Tingberg; [2000]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Clinical physics; normal anatomy; free response forced error FFE ; receiver operating characteristics ROC ; visual grading analysis VGA ; European image criteria; quantifying clinical image quality; radiology; tomography; medical instrumentation; Klinisk fysiologi; radiologi; tomografi; medicinsk instrumentering;

    Sammanfattning : Optimisation in diagnostic radiology requires accurate methods for determination of patient absorbed dose and clinical image quality. Simple methods for evaluation of clinical image quality are at present scarce and this project aims at developing such methods. LÄS MER

  4. 4. The dependency of image quality on acquisition protocol and image processing in chest tomosynthesis

    Detta är en avhandling från Stockholm : Karolinska Institutet, Dept of Clinical Science, Intervention and Technology

    Författare :Masoud Jadidi; Karolinska Institutet.; Karolinska Institutet.; [2019]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Sammanfattning : The digital tomosynthesis (DTS) technique is a next generation of the old tomography technique, the use of which has been extended during the past decade. The interest in this technique has increased more and more in Radiology due to its ability to provide threedimensional images by acquiring a number of projection radiographs at lower radiation dose and potentially lower cost than CT in certain clinical situations. LÄS MER

  5. 5. High quality frequency modulated halftoning

    Detta är en avhandling från Linköping : Linköpings universitet

    Författare :Sasan Gooran; [2001]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The fact that most printing devices, such as laser printers, are restricted to very few colors has led to an increased interest in finding efficient techniques that transform a continuoustone image into a binary one. Such techniques are referred to as halftoning methods. LÄS MER