Håvard Kalvøy

• Cunha, André; Schülke, Christin; Mesri, Alireza; Ruud, Simen Kristoffer; Aizenshtadt, Aleksandra & Ferrari, Giorgio [Vis alle 16 forfattere av denne artikkelen] (2024). Development of a Smart Wireless Multisensor Platform for an Optogenetic Brain Implant. Sensors. ISSN 1424-8220. 24(2). doi: 10.3390/s24020575.
• Tariverdi, Abbas; Côté-Allard, Ulysse Teller Masao; Mathiassen, Kim; Elle, Ole Jakob; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2023). Reinforcement Learning-Based Switching Controller for a Milliscale Robot in a Constrained Environment. IEEE Transactions on Automation Science and Engineering. ISSN 1545-5955. 21(2), s. 2000–2016. doi: 10.1109/TASE.2023.3259905.
• Tronstad, Christian; Amini, Maryam; Olesen, Eline; Qvigstad, Elisabeth; Pabst, Oliver & Martinsen, Tormod [Vis alle 11 forfattere av denne artikkelen] (2022). Diabetic foot assessment using skin impedance in a custom made sensor-sock. Journal of Electrical Bioimpedance. ISSN 1891-5469. 13(1), s. 136–142. doi: 10.2478/joeb-2022-0019. Fulltekst i vitenarkiv
• Tariverdi, Abbas; Mathiassen, Kim; Søyseth, Vegard; Kalvøy, Håvard; Elle, Ole Jakob & Tørresen, Jim [Vis alle 7 forfattere av denne artikkelen] (2022). Physics-Based Simulation and Control Framework for Steering a Magnetically-Actuated Guidewire. I Dilger, Lale Canan (Red.), 2022 8th International Conference on Control, Decision and Information Technologies (CoDIT). IEEE (Institute of Electrical and Electronics Engineers). ISSN 978-1-6654-9607-0. doi: 10.1109/CoDIT55151.2022.9803963.
• Wiegerinck, Anouk; Thomsen, Andreas; Hisdal, Jonny; Kalvøy, Håvard & Tronstad, Christian (2021). Electrical impedance plethysmography versus tonometry to measure the pulse wave velocity in peripheral arteries in young healthy volunteers: a pilot study. Journal of Electrical Bioimpedance. ISSN 1891-5469. 12(1), s. 169–177. doi: 10.2478/joeb-2021-0020. Fulltekst i vitenarkiv
• Tronstad, Christian; Martinsen, Tormod; Olsen, Morten; Rosseland, Leiv Arne; Pettersen, Fred-Johan & Martinsen, Ørjan Grøttem [Vis alle 8 forfattere av denne artikkelen] (2020). Splitting one ventilator for multiple patients - a technical assessment. arXiv.org. ISSN 2331-8422.
• Amini, Maryam; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2020). Finite element simulation of the impedance response of a vascular segment as a function of changes in electrode configuration. Journal of Electrical Bioimpedance. ISSN 1891-5469. 11(1), s. 112–131. doi: 10.2478/JOEB-2020-0017. Fulltekst i vitenarkiv
• Cunha, Andrè Bastos da; Schuelke, Christin; Heiskanen, Arto; Asif, Afia; Hassan, Yasmin M. & Keller, Stephan S. [Vis alle 10 forfattere av denne artikkelen] (2020). Bioimpedance Measurements on Human Neural Stem Cells as a Benchmark for the Development of Smart Mobile Biomedical Applications. International Federation for Medical and Biological Engineering Proceedings. ISSN 1680-0737. 72, s. 38–47. doi: 10.1007/978-981-13-3498-6_6. Fulltekst i vitenarkiv Vis sammendrag

  Over the past 30 years, stem cell technologies matured from an attractive option to investigate neurodegenerative diseases to a possible paradigm shift in their treatment through the development of cell-based regenerative medicine (CRM). Implantable cell replacement therapies promise to completely restore function of neural structures possibly changing how we currently perceive the onset of these conditions. One of the major clinical hurdles facing the routine implementation of stem cell therapy is the limited and inconsistent benefit observed thus far. While unclear, numerous pre-clinical and a handful of clinical cell fate imaging studies point to poor cell retention and survival. Coupling the need to better understand these mechanisms while providing scalable approaches to monitor these treatments in both pre-clinical and clinical scenarios, we show a proof of concept bioimpedance electronic platform for the Agile development of smart and mobile biomedical applications like neural implants or highly portable monitoring devices.

• Amini, Maryam; Niemi, Essi Maria; Hisdal, Jonny; Kalvøy, Håvard; Tronstad, Christian & Scholz, Hanne [Vis alle 8 forfattere av denne artikkelen] (2020). Monitoring the quality of frozen-thawed venous segments using bioimpedance spectroscopy . Physiological Measurement. ISSN 0967-3334. 41(4). doi: 10.1088/1361-6579/ab85b7. Fulltekst i vitenarkiv
• Amini, Maryam; Hisdal, Jonny; Rosales, Antonio; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2020). Evaluating the Effects of Cold Storage on Vascular Grafts Using Bioimpedance Measurement Techniques. International Federation for Medical and Biological Engineering Proceedings. ISSN 1680-0737. s. 127–132. doi: 10.1007/978-981-13-3498-6_19.
• Tronstad, Christian; Høgetveit, Jan Olav; Elvebakk, Ole & Kalvøy, Håvard (2019). Age-related differences in the morphology of the impedance cardiography signal. Journal of Electrical Bioimpedance. ISSN 1891-5469. 10(1), s. 139–145. doi: 10.2478/joeb-2019-0020. Fulltekst i vitenarkiv
• Martinsen, Ørjan Grøttem; Kalvøy, Håvard; Bari, Dindar S. & Tronstad, Christian (2019). A circuit for simultaneous measurements of skin electrical conductance, susceptance, and potential. Journal of Electrical Bioimpedance. ISSN 1891-5469. 10, s. 110–112. doi: 10.2478/joeb-2019-0016. Fulltekst i vitenarkiv
• Martinsen, Tormod; Pettersen, Fred-Johan; Kalvøy, Håvard; Tronstad, Christian; Kvarstein, Gunnvald & Bakken, André [Vis alle 10 forfattere av denne artikkelen] (2019). Electrosurgery and temperature increase in tissue with a passive metal implant. Frontiers in surgery. ISSN 2296-875X. 6:8, s. 1–8. doi: 10.3389/fsurg.2019.00008. Fulltekst i vitenarkiv
• Elvebakk, Ole; Tronstad, Christian; Birkeland, Kåre I.; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Gulseth, Hanne Løvdal [Vis alle 9 forfattere av denne artikkelen] (2019). A multiparameter model for non-invasive detection of hypoglycemia. Physiological Measurement. ISSN 0967-3334. 40(8), s. 1–14. doi: 10.1088/1361-6579/ab3676. Fulltekst i vitenarkiv
• Aria, Shafa; Elfarri, Yassine; Elvegård, Marius; Gottfridsson, Adam; Grønaas, Halvor & Harang, Sigve Smedsrud [Vis alle 25 forfattere av denne artikkelen] (2019). Measuring blood pulse wave velocity with bioimpedance in different age groups. Sensors. ISSN 1424-8220. 19:850(4), s. 1–10. doi: 10.3390/s19040850. Fulltekst i vitenarkiv
• Bjørhei, Andreas; Pedersen, Filip T.; Muhammad, Saeed; Tronstad, Christian; Kalvøy, Håvard & Wojniusz, Slawomir [Vis alle 8 forfattere av denne artikkelen] (2019). An investigation on bilateral asymmetry in electrodermal activity. Frontiers in Behavioral Neuroscience. ISSN 1662-5153. 13(88). doi: 10.3389/fnbeh.2019.00088. Fulltekst i vitenarkiv
• Tronstad, Christian; Elvebakk, Ole; Staal, Odd Martin; Kalvøy, Håvard; Høgetveit, Jan Olav & Jenssen, Trond Geir [Vis alle 8 forfattere av denne artikkelen] (2019). Non-invasive prediction of blood glucose trends during hypoglycemia. Analytica Chimica Acta. ISSN 0003-2670. 1052, s. 37–48. doi: 10.1016/j.aca.2018.12.009.
• Anso, Juan; Balmer, Thomas W; Jegge, Yves; Kalvøy, Håvard; Bell, Brett J & Dur, Cilgia [Vis alle 16 forfattere av denne artikkelen] (2018). Electrical impedance to assess facial nerve proximity during robotic cochlear implantation. IEEE Transactions on Biomedical Engineering. ISSN 0018-9294. 66(1), s. 237–245. doi: 10.1109/TBME.2018.2830303.
• Bari, D. S.; Aldosoky, H. Y. Y.; Tronstad, Christian; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2018). Electrodermal activity responses for quantitative assessment of felt pain. Journal of Electrical Bioimpedance. ISSN 1891-5469. 9, s. 52–58. doi: 10.2478/joeb-2018-0010. Fulltekst i vitenarkiv
• Amini, Maryam; Hisdal, Jonny & Kalvøy, Håvard (2018). Applications of bioimpedance measurement techniques in tissue engineering . Journal of Electrical Bioimpedance. ISSN 1891-5469. 9(1), s. 142–158. doi: 10.2478/joeb-2018-0019. Fulltekst i vitenarkiv
• Bari, Dindar S.; Aldosky, Haval Y. Yacoob; Tronstad, Christian; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2018). Influence of relative humidity on electrodermal levels and responses. Skin Pharmacology and Physiology. ISSN 1660-5527. 31, s. 298–307. doi: 10.1159/000492275.
• Elvebakk, Ole; Tronstad, Christian; Birkeland, Kåre I.; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Frøslie, Kathrine Frey [Vis alle 10 forfattere av denne artikkelen] (2018). Evaluation of hypoglycaemia with non-invasive sensors in people with type 1 diabetes and impaired awareness of hypoglycaemia. Scientific Reports. ISSN 2045-2322. 8:14722, s. 1–11. doi: 10.1038/s41598-018-33189-1. Fulltekst i vitenarkiv
• Strand-Amundsen, Runar James; Tronstad, Christian; Kalvøy, Håvard; Ruud, Tom Erik; Høgetveit, Jan Olav & Martinsen, Ørjan Grøttem [Vis alle 7 forfattere av denne artikkelen] (2018). Small intestinal ischemia and reperfusion - Bioimpedance measurements. Physiological Measurement. ISSN 0967-3334. 39(2). doi: 10.1088/1361-6579/aaa576. Fulltekst i vitenarkiv
• Bari, D. S.; Aldosky, H. Y. Y.; Tronstad, Christian; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2017). Electrodermal responses to discrete stimuli measured by skin conductance, skin potential, and skin susceptance. Skin Research and Technology. ISSN 0909-752X. 24(1), s. 108–116. doi: 10.1111/srt.12397.
• Kalvøy, Håvard; Tronstad, Christian; Ullensvang, Kyrre; Steinfeldt, Thorsten & Sauter, Axel Rudolf (2017). Detection of needle to nerve contact based on electric bioimpedance and machine learning methods. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. ISSN 1557-170X. s. 9–12. doi: 10.1109/EMBC.2017.8036750.
• Tronstad, Christian; Elvebakk, Ole; Kalvøy, Håvard; Bjørgaas, Marit Ragnhild Rokne & Martinsen, Ørjan Grøttem (2017). Detection of sympathoadrenal discharge by parameterisation of skin conductance and ECG measurement. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. ISSN 1557-170X. s. 3997–4000. doi: 10.1109/EMBC.2017.8037732.
• Strand-Amundsen, Runar James; Reims, Henrik Mikael; Tronstad, Christian; Kalvøy, Håvard; Martinsen, Ørjan Grøttem & Høgetveit, Jan Olav [Vis alle 8 forfattere av denne artikkelen] (2017). Ischemic small intestine - In vivo versus ex vivo bioimpedance measurements. Physiological Measurement. ISSN 0967-3334. 38(5), s. 715–728. doi: 10.1088/1361-6579/aa67b7.
• Pettersen, Fred Johan; Martinsen, Ørjan Grøttem; Høgetveit, Jan Olav; Kalvøy, Håvard & Odland, Hans Henrik (2016). Bioimpedance spectroscopy of temporal impedance changes in a beating heart. Biomedical Engineering & Physics Express. ISSN 2057-1976. 2. doi: 10.1088/2057-1976/2/6/065015.
• Strand-Amundsen, Runar James; Tronstad, Christian; Kalvøy, Håvard; Gundersen, Yngvar; Krohn, Claus Danckert & Aasen, Ansgar Oddne [Vis alle 11 forfattere av denne artikkelen] (2016). In vivo characterization of ischemic small intestine using bioimpedance measurements. Physiological Measurement. ISSN 0967-3334. 37(2), s. 257–275. doi: 10.1088/0967-3334/37/2/257. Vis sammendrag

  The standard clinical method for the assessment of viability in ischemic small intestine is still visual inspection and palpation. This method is non-specific and unreliable, and requires a high level of clinical experience. Consequently, viable tissue might be removed, or irreversibly damaged tissue might be left in the body, which may both slow down patient recovery. Impedance spectroscopy has been used to measure changes in electrical parameters during ischemia in various tissues. The physical changes in the tissue at the cellular and structural levels after the onset of ischemia lead to time-variant changes in the electrical properties. We aimed to investigate the use of bioimpedance measurement to assess if the tissue is ischemic, and to assess the ischemic time duration. Measurements were performed on pigs (n  =  7) using a novel two-electrode setup, with a Solartron 1260/1294 impedance gain-phase analyser. After induction of anaesthesia, an ischemic model with warm, full mesenteric arterial and venous occlusion on 30 cm of the jejunum was implemented. Electrodes were placed on the serosal surface of the ischemic jejunum, applying a constant voltage, and measuring the resulting electrical admittance. As a control, measurements were done on a fully perfused part of the jejunum in the same porcine model. The changes in tan δ (dielectric parameter), measured within a 6 h period of warm, full mesenteric occlusion ischemia in seven pigs, correlates with the onset and duration of ischemia. Tan δ measured in the ischemic part of the jejunum differed significantly from the control tissue, allowing us to determine if the tissue was ischemic or not (P  <  0.0001, F  =  (1,75.13) 188.19). We also found that we could use tan δ to predict ischemic duration. This opens up the possibility of real-time monitoring and assessment of the presence and duration of small intestinal ischemia.

• Kalvøy, Håvard; Aliau-Bonet, C; Pallas-Areny, R. & Martinsen, Ørjan Grøttem (2015). Effects of stray capacitance to ground in three electrode monopolar needle bioimpedance measurements. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. ISSN 1557-170X. 2015-November, s. 7542–7545. doi: 10.1109/EMBC.2015.7320137.
• Kalvøy, Håvard & Sauter, Axel Rudolf (2015). Detection of intraneural needle-placement with multiple frequency bioimpedance monitoring: a novel method. Journal of clinical monitoring and computing. ISSN 1387-1307. doi: 10.1007/s10877-015-9698-3.
• Pettersen, Fred Johan; Ferdous, Humayra; Kalvøy, Håvard; Martinsen, Ørjan Grøttem & Høgetveit, Jan Olav (2014). Comparison of four different FIM configurations - A simulation study. Physiological Measurement. ISSN 0967-3334. 35(6), s. 1067–1082. doi: 10.1088/0967-3334/35/6/1067.
• Haugan, Berit; Langerud, Anne Kathrine; Kalvøy, Håvard; Frøslie, Kathrine Frey; Riise, Else & Kapstad, Heidi (2013). Can we trust the new generation of infrared tympanic thermometers in clinical practice? Journal of Clinical Nursing (JCN). ISSN 0962-1067. 22(5-6), s. 698–709. doi: 10.1111/j.1365-2702.2012.04077.x.
• Tronstad, Christian; Kalvøy, Håvard; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2013). Waveform difference between skin conductance and skin potential responses in relation to electrical and evaporative properties of skin. Psychophysiology. ISSN 0048-5772. 50(11), s. 1070–1078. doi: 10.1111/psyp.12092.
• Tronstad, Christian; Kalvøy, Håvard; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2013). Improved Estimation of Sweating Based on Electrical Properties of Skin. Annals of Biomedical Engineering. ISSN 0090-6964. 41(5), s. 1074–1083. doi: 10.1007/s10439-013-0743-4.
• Kvaløy, Håvard; Johnsen, Gorm Krogh; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2011). New method for separation of electrode polarization impedance from measured tissue impedance. Open Biomedical Engineering Journal. ISSN 1874-1207. 5, s. 8–13. doi: 10.2174/1874120701105010008.
• Høyum, Per; Kalvøy, Håvard; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2010). Finite element model of needle electrode sensitivity. Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. 224(1).
• Kalvøy, Håvard; Høyum, Per; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2010). From impedance theory to needle electrode guidance in tissue. Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. 224. doi: 10.1088/1742-6596/224/1/012072.
• Martinsen, Ørjan Grøttem; Kalvøy, Håvard; Grimnes, Sverre; Nordbotten, Bernt Jørgen; Hol, Per Kristian & Fosse, Erik [Vis alle 8 forfattere av denne artikkelen] (2010). Invasive electrical impedance tomography for blood vessel detection. Open Biomedical Engineering Journal. ISSN 1874-1207. 4, s. 135–137. doi: 10.2174/1874120701004010135.
• Kalvøy, Håvard; Tronstad, Christian; Nordbotten, Bernt Jørgen; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2010). Electrical Impedance of Stainless Steel Needle Electrodes. Annals of Biomedical Engineering. ISSN 0090-6964. 38(7), s. 2371–2382. doi: 10.1007/s10439-010-9989-2.
• Høyum, Per; Kvaløy, Håvard; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2010). A finite element model of needle electrode spatial sensitivity. Physiological Measurement. ISSN 0967-3334. 31(10), s. 1369–1379. doi: 10.1088/0967-3334/31/10/006.
• Kvaløy, Håvard; Frich, Lars Inge; Grimnes, Sverre; Martinsen, Ørjan Grøttem; Hol, Per Kristian & Stubhaug, Audun (2009). Impedance-based tissue discrimination for needle guidance. Physiological Measurement. ISSN 0967-3334. 30(2), s. 129–140. doi: 10.1088/0967-3334/30/2/002.
• Sauter, Axel Rudolf; Dodgson, Michael; Kvaløy, Håvard; Grimnes, Sverre; Stubhaug, Audun & Klaastad, Øivind (2009). Current Threshold for Nerve Stimulation Depends on Electrical Impedance of the Tissue: A Study of Ultrasound-Guided Electrical Nerve Stimulation of the Median Nerve. Anesthesia and Analgesia. ISSN 0003-2999. 108(4), s. 1338–1343. doi: 10.1213/ane.0b013e3181957d84.
• Kvaløy, Håvard; Nordbotten, Bernt Jørgen; Tronstad, Christian; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2009). Impedance properties of stainless steel needle electrodes. International Federation for Medical and Biological Engineering Proceedings. ISSN 1680-0737. 25, s. 380–383.
• Tronstad, Christian; Krogstad, Anne Lene; Kvaløy, Håvard; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2009). Skin AC conductance levels and responses in axillary hyperhidrosis patients. International Federation for Medical and Biological Engineering Proceedings. ISSN 1680-0737. 25, s. 349–351.
• Kalvøy, Håvard; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2008). Determination of tissue type surrounding a needle tip by electrical bioimpedance. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. ISSN 1557-170X. s. 2285–2286.
• Kalvøy, Håvard; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2007). Needle position determined by tissue impedance. International Federation for Medical and Biological Engineering Proceedings. ISSN 1680-0737. 17, s. 205–208.

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• Elvebakk, Ole; Tronstad, Christian; Birkeland, Kåre Inge; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Frøslie, Kathrine Frey [Vis alle 10 forfattere av denne artikkelen] (2019). Author Correction: Evaluation of Hypoglycaemia with Non-Invasive Sensors in People with Type 1 Diabetes and Impaired Awareness of Hypoglycaemia (Scientific Reports, (2018), 8, 1, (14722), 10.1038/s41598-018-33189-1). Scientific Reports. ISSN 2045-2322. 9(1). doi: 10.1038/s41598-019-42218-6.
• Pettersen, Fred Johan; Martinsen, Ørjan Grøttem; Høgetveit, Jan Olav; Flattum, M.; Kalvøy, Håvard & Odland, Hans Henrik (2016). Using pacemaker leads for bioimpedance and electromyography. Proceedings of the 16th International Conference on Electrical Bioimpedance.
• Kalvøy, Håvard; Sauter, Axel Rudolf; Tronstad, Christian & Martinsen, Ørjan Grøttem (2016). Neural tissue discrimination with machine learning methods. Proceedings of the 16th International Conference on Electrical Bioimpedance.
• Tronstad, Christian; Elvebakk, Ole; Martinsen, Ørjan Grøttem; Kalvøy, Håvard & Høgetveit, Jan Olav (2016). Bioimpedance for prediction of hypoglycemic trends. Proceedings of the 16th International Conference on Electrical Bioimpedance.
• Kalvøy, Håvard; Aliau-Bonet, C.; Pallas-Areny, R. & Martinsen, Ørjan Grøttem (2015). Effects of stray capacitance to ground in three electrode monopolar needle bioimpedance measurements.
• Tronstad, Christian; Kalvøy, Håvard; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2013). Sweat production estimated by bioimpedance and bioelectrical signals.
• Kalvøy, Håvard; Tronstad, Christian; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2013). Simultaneous measurement of DC potential and AC conductance to monitor electrodermal activity at a single electrode.
• Amoussou-Guenou, Kuassi M.; Houndetoungan, G. D.; Fachinan, O. H.; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2013). Comparison of two filtration methods in erythrocyte deformability: determination measurement using impedancemetry.
• Kvaløy, Håvard; Tronstad, Christian; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2012). Electrodermal activity measured as DC potential and AC conductance at the same electrode. International Federation for Medical and Biological Engineering Proceedings. ISSN 1680-0737. 39.
• Tronstad, Christian; Kvaløy, Håvard; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2012). New parameters of electrodermal activity and estimation of sweat production. International Federation for Medical and Biological Engineering Proceedings. ISSN 1680-0737. 39.
• Kalvøy, Håvard; Grimnes, Sverre; Martinsen, Ørjan Grøttem & Høyum, Per (2006). Current distribution and impedance in monopolar needle electrode systems.
• Kalvøy, Håvard (2010). Needle Guidance in Clinical Applications based on Electrical Impedance. Det matematisk-naturvitenskapelige fakultet.

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