Sökning: "computed tomography"

Visar resultat 1 - 5 av 368 avhandlingar innehållade orden computed tomography.

  1. 1. Metal artifacts in computed tomography : impact of reduction methods on image quality and radiotherapy treatment planning

    Detta är en avhandling från Örebro : Örebro University

    Författare :Karin Andersson; Örebro universitet.; [2018]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; computed tomography; metal artifacts; image quality; visual grading analysis; radiotherapy; proton therapy; hip prosthesis; dental implants;

    Sammanfattning : Degradation of image quality by metal artifacts is a common problem in computed tomography (CT) imaging, which can limit the diagnostic value of a CT examination and also introduce inaccuracies in radiotherapy (RT) treatment planning. In recent years, commercial metal artifact reduction (MAR) methods have been launched by several CT vendors. LÄS MER

  2. 2. Computed tomography in endodontic decision making

    Detta är en avhandling från Malmö university

    Författare :Fernando José Mota de Almeida; Malmö University.; [2019]
    Nyckelord :ODONTOLOGY; ODONTOLOGI; Medicine; endodontics; decision making; computed tomography; CBCT; cone beam; interviews; qualitative content analysis; diagnostic thinking efficacy; therapeutic efficacy;

    Sammanfattning : Computed tomography has been used in dentistry as a complement to two-dimensional (2D) imaging since the 1980s. The advent of cone beam computed tomography (CBCT), a more modern computed tomog-raphy technique, meant a revolution in dento-maxillofacial imaging due to sharper images, with less radiation and at a lower cost than with mul-ti-slice computed tomography (MSCT), i. LÄS MER

  3. 3. Computed tomography of sawlogs knot detection and sawing optimization

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Erik Johansson; Luleå tekniska universitet.; RISE.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Träteknik; Wood Technology;

    Sammanfattning : Branches on trees introduce defects on sawn timber called knots. By scanning sawlogs using computed tomography, knots can be detected and accounted for so that the sawing process can be optimized with respect to outgoing product value. LÄS MER

  4. 4. Diagnostic quality in computed tomography angiography after EVAR

    Detta är en avhandling från Lund University, Faculty of Medicine

    Författare :Leena Lehti; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2019]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; computed tomography angiography; image reconstruction; Abdominal aortic aneurysm; dual-energy computed tomography; metal artefact reduction; EVAR; contrast medium induced nephropathy;

    Sammanfattning : .... LÄS MER

  5. 5. Low-dose computed tomography of the abdomen and lumbar spine

    Detta är en avhandling från Örebro : Örebro university

    Författare :Muhammed Alshamari; Örebro universitet.; [2016]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Tomography; X-Ray Computed; Radiography; Radiation Dosage; Abdomen; Spine; Lumbosacral Region; Regression Analysis; Kirurgi; Surgery;

    Sammanfattning : Radiography is a common radiologic investigation despite abundant evidence of its limited diagnostic value. On the other hand, computed tomography (CT) has a high diagnostic value and is widely considered to be among the most important advances in medicine. LÄS MER