Search for dissertations about: "computed tomography"

Showing result 1 - 5 of 353 swedish dissertations containing the words computed tomography.

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

    University dissertation from Örebro : Örebro University

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

    Abstract : 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. READ MORE

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

    University dissertation from Luleå : Luleå tekniska universitet

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

    Abstract : 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. READ MORE

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

    University dissertation from Lund University, Faculty of Medicine

    Author : Leena Lehti; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2019]
    Keywords : 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;

    Abstract : .... READ MORE

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

    University dissertation from Örebro : Örebro university

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

    Abstract : 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. READ MORE

  5. 5. Conventional spiral and low-dose computed mandibular tomography for dental implant planning

    University dissertation from Göteborg : University of Gothenburg

    Author : Annika Ekestubbe; Göteborgs universitet.; Gothenburg University.; [1999]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Artifacts; Dental Implantation; Endosseous; methods; Dental Implants; Humans; Jaw; Edentulous; radiography; Mandible; radiography; Patient Care Planning; Phantoms; Imaging; Radiation Dosage; Radiography; Dental; methods; Reproducibility of Results; Tomography; X-Ray; instrumentation; methods; Tomography; X-Ray Computed; methods;

    Abstract : Absorbed doses to radiosensitive organs in the head and neck from pre-implant conventional hypocycloidal, conventional spiral and computed tomography (CT) were measured with thermoluminescent dosimeters in an anthropomorphic phantom head. From conventional tomography organ doses, except to the major salivary glands, were below 0.2 mGy. READ MORE