Browsing Fysisk institutt by Author "Tønnessen, Tor Inge"

Now showing items 1-7 of 7

  • Assessing ischemic injury in human intestine ex vivo with electrical impedance spectroscopy 
    Hou, Jie; Strand-Amundsen, Runar James; Hødnebø, Stina; Tønnessen, Tor Inge; Høgetveit, Jan Olav (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract Electrical impedance spectroscopy is a well-established tool for monitoring changes in the electrical properties of tissue. Most tissue and organ types have been investigated in various studies. As for ...
  • Assessment of Intestinal Ischemia–Reperfusion Injury Using Diffuse Reflectance VIS-NIR Spectroscopy and Histology 
    Hou, Jie; Ness, Siri Schøne; Tschudi, Jon; O'Farrell, Marion; Veddegjerde, Rune; Martinsen, Ørjan Grøttem; Tønnessen, Tor Inge; Strand-Amundsen, Runar James (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    A porcine model was used to investigate the feasibility of using VIS-NIR spectroscopy to differentiate between degrees of ischemia–reperfusion injury in the small intestine. Ten pigs were used in this study and four segments ...
  • Automatic prediction of ischemia-reperfusion injury of small intestine using convolutional neural networks: A pilot study 
    Hou, Jie; Strand-Amundsen, Runar; Tronstad, Christian; Høgetveit, Jan Olav; Martinsen, Ørjan Grøttem; Tønnessen, Tor Inge (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Acute intestinal ischemia is a life-threatening condition. The current gold standard, with evaluation based on visual and tactile sensation, has low specificity. In this study, we explore the feasibility of using machine ...
  • Machine learning for intraoperative prediction of viability in ischemic small intestine 
    Strand-Amundsen, Runar James; Tronstad, Christian; Reims, Henrik Mikael; Reinholt, Finn P.; Høgetveit, Jan Olav; Tønnessen, Tor Inge (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Objective: Evaluation of intestinal viability is essential in surgical decision-making in patients with acute intestinal ischemia. There has been no substantial change in the mortality rate (30-93%) of patients with acute ...
  • Small intestinal ischemia and reperfusion - Bioimpedance measurements 
    Strand-Amundsen, Runar James; Tronstad, Christian; Kalvøy, Håvard; Ruud, Tom Erik; Høgetveit, Jan Olav; Martinsen, Ørjan Grøttem; Tønnessen, Tor Inge (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Objective: Trans-intestinal bioimpedance measurements have previously been used to investigate changes in electrical parameters during 6h of ischemia in the small intestine. Knowledge is lacking regarding the time course ...
  • Small intestinal viability assessment using dielectric relaxation spectroscopy and deep learning 
    Hou, Jie; Strand-Amundsen, Runar James; Tronstad, Christian; Tønnessen, Tor Inge; Høgetveit, Jan Olav; Martinsen, Ørjan Grøttem (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract Intestinal ischemia is a serious condition where the surgeon often has to make important but difficult decisions regarding resections and resection margins. Previous studies have shown that 3 h (hours) of warm ...
  • Utilization of dielectric properties for assessment of liver ischemia-reperfusion injury in vivo and during machine perfusion 
    Hou, Jie; Liavåg, Olav Magnus Ivar; Færden, Ida Høy; Martinsen, Ørjan Grøttem; Tønnessen, Tor Inge; Line, Pål Dag; Hagness, Morten; Høgetveit, Jan Olav; Pischke, Soeren; Strand-Amundsen, Runar James (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract There is a shortage of donor livers and patients consequently die on waiting lists worldwide. Livers are discarded if they are clinically judged to have a high risk of non-function following transplantation. With ...