Blar i NTNU Open på forfatter "Mårvik, Ronald"
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Anthropomorphic liver phantom with flow for multimodal image-guided liver therapy research and training
Rethy, Anna; Sæternes, Jørn Ove; Halgunset, Jostein; Mårvik, Ronald; Hofstad, Erlend Fagertun; Sanchez-Margallo, Juan A.; Langø, Thomas (Journal article; Peer reviewed, 2017)Purpose The objective of this study was to develop a multimodal, permanent liver phantom displaying functional vasculature and common pathologies, for teaching, training and equipment development in laparoscopic ultrasound ... -
Biochemical profiling of diabetes disease progression by multivariate vibrational microspectroscopy of the pancreas
Nord, Christoffer; Eriksson, Maria; Dicker, Andrea; Eriksson, Anna; Grong, Eivind; Ilegems, Erwin; Mårvik, Ronald; Kulseng, Bård Eirik; Berggren, Per-Olof; Gorzsás, András; Ahlgren, Ulf (Journal article; Peer reviewed, 2017)Despite the dramatic increase in the prevalence of diabetes, techniques for in situ studies of the underlying pancreatic biochemistry are lacking. Such methods would facilitate obtaining mechanistic understanding of diabetes ... -
Characteristics of Patients Reporting Presumed Problematic Drinking Behavior After Gastric Bypass: Exploring Long-Term Data From the BAROBS Study
Strømmen, Magnus; Kløckner, Christian; Bjerkan, Kirsti Kverndokk; Græslie, Hallvard; Hoff, Dag Arne Lihaug; Johnsen, Gjermund; Kulseng, Bård; Mårvik, Ronald; Nymo, Siren; Sandvik, Jorunn (Peer reviewed; Journal article, 2021)Objective: To explore patients’ long-term experiences with drinking alcohol after Roux-n-Y gastric bypass (RYGB) for conceptualizing what may indicate problematic drinking behavior after bariatric surgery. Study Design: ... -
Construct validity of eoSim - a low-cost and portable laparoscopic simulator
Mansoor, Saira Mauland; Våpenstad, Cecilie; Mårvik, Ronald; Glomsaker, Tom Birger; Bliksøen, Marte (Peer reviewed; Journal article, 2019)Purpose: To examine the construct validity of the low-cost, portable laparoscopic simulator eoSim using motion analysis. Material and methods: Novice and experienced surgeons (≤ 100 and >100 laparoscopic procedures ... -
Health-Related Quality of Life in Obese Presurgery Patients with and without Binge Eating Disorder, and Subdiagnostic Binge Eating Disorders
Sandberg, Rita Marie; Dahl, Jens Kornelius; Vedul-Kjelsås, Einar; Engum, Bjørnar; Kulseng, Bård Eirik; Mårvik, Ronald; Eriksen, Lasse (Journal article; Peer reviewed, 2013)Objective. To study health-related quality of life (HRQoL) in obese presurgery patients with binge eating disorder (BED) and with subdiagnostic binge eating disorder (SBED) compared to patients without eating disorders or ... -
Laboratory test of Single Landmark registration method for ultrasound-based navigation in laparoscopy using an open-source platform
Perez de Frutos, Javier; Hofstad, Erlend Fagertun; Solberg, Ole Vegard; Tangen, Geir Arne; Lindseth, Frank; Langø, Thomas; Elle, Ole Jacob; Mårvik, Ronald (Journal article; Peer reviewed, 2018)Purpose Test the feasibility of the novel Single Landmark image-to-patient registration method for use in the operating room for future clinical trials. The algorithm is implemented in the open-source platform CustusX, a ... -
Lack of transfer of skills after virtual reality simulator training with haptic feedback
Våpenstad, Cecilie; Hofstad, Erlend Fagertun; Bø, Lars Eirik; Kuhry, Esther; Johnsen, Gjermund; Mårvik, Ronald; Langø, Thomas; Hernes, Toril A. Nagelhus (Journal article; Peer reviewed, 2017)Background and objective: Virtual reality (VR) simulators enrich surgical training and offer training possibilities outside of the operating room (OR). In this study, we created a criterion-based training program on a VR ... -
Mechanistic Comparison between Gastric Bypass vs. Duodenal Switch with Sleeve Gastrectomy in Rat Models
Kodama, Yosuke; Johannessen, Helene; Furnes, Marianne Waldum; Zhao, Chun-Mei; Johnsen, Gjermund; Mårvik, Ronald; Kulseng, Bård; Chen, Duan (Journal article; Peer reviewed, 2013)Background: Both gastric bypass (GB) and duodenal switch with sleeve gastrectomy (DS) have been widely used as bariatric surgeries, and DS appears to be superior to GB. The aim of this study was to better understand the ... -
MOBESITY: eHealth for Patients Undergoing Weight Loss Treatment - from Idea to Evaluation
Das, Anita (Doctoral theses at NTNU;2016:94, Doctoral thesis, 2016)MOBESITY: eHelse for pasienter som gjennomgår vektreduserende behandling, fra ide til evaluering. Fedme er ansett som en kronisk sykdom og krever store økonomiske og helsemessige ressurser. Vektreduksjon har gunstige ... -
Multimodal Phantom of Liver Tissue
Chmarra, Magdalena Karolina; Hansen, Rune; Mårvik, Ronald; Langø, Thomas (Journal article; Peer reviewed, 2013)Medical imaging plays an important role in patients' care and is continuously being used in managing health and disease. To obtain the maximum benefit from this rapidly developing technology, further research is needed. ... -
Optimal timing of assessment tasks depending on experience level of surgical trainees
Våpenstad, Cecilie; Hofstad, Erlend Fagertun; Bernstein, Tor Eivind; Aadahl, Petter; Johnsen, Gjermund; Mårvik, Ronald (Peer reviewed; Journal article, 2019)Introduction: Box trainers with motion analysis are important add-ons to surgical training and skills assessment outside the operating room, given that they exhibit construct validity. Material and methods: Four different ... -
Potential Adhesion Prevention Strategies: Three studies on the effectiveness of different potential adhesion prevention strategies regarding reduction of postoperative peritoneal adhesion formation.
Wiebe de Vries, Arild (Doctoral theses at NTNU;2017:268, Doctoral thesis, 2017) -
Psychomotor skills assessment by motion analysis in minimally invasive surgery on an animal organ
Hofstad, Erlend Fagertun; Våpenstad, Cecilie; Bø, Lars Eirik; Langø, Thomas; Kuhry, Esther; Mårvik, Ronald (Journal article; Peer reviewed, 2017)Background: A high level of psychomotor skills is required to perform minimally invasive surgery (MIS) safely. To be able to measure these skills is important in the assessment of surgeons, as it enables constructive ... -
Relevance of TNBS-Colitis in Rats: A Methodological Study with Endoscopic, Historical and Transcripttomic Characterization and Correlation to IBD
Brenna, Øystein; Furnes, Marianne Waldum; Drozdov, Ignat; Granlund, Atle Van Beelen; Flatberg, Arnar; Sandvik, Arne Kristian; Zwiggelaar, Rosalie; Mårvik, Ronald; Nordrum, Ivar Skjåk; Kidd, Mark; Gustafsson, Björn (Journal article; Peer reviewed, 2013)Background: Rectal instillation of trinitrobenzene sulphonic acid (TNBS) in ethanol is an established model for inflammatory bowel disease (IBD). We aimed to 1) set up a TNBS-colitis protocol resulting in an endoscopic ... -
Simulation-based Training and Assessment in Minimally Invasive Surgery Exploration and Validation
Våpenstad, Cecilie (Doctoral theses at NTNU;2019:323, Doctoral thesis, 2019)Changes in surgical techniques and public attention to surgeons’ competencies in general, created a growth in simulation-based training in the late 90’s. The introduction of minimally invasive surgery, with its distinct ... -
The effect of bariatric surgery and gastrointestinal hormone secretion on glycemic control and beta-cell mass - Lessons learned from the diabetic Goto-Kakizaki rat
Grong, Eivind (Doctoral theses at NTNU;2018:258, Doctoral thesis, 2018)This thesis reports the results from experimental animal studies assessing the effect of bariatric surgery on type 2 diabetes mellitus (T2DM) and gastrointestinal hormone secretion. After bariatric surgery in obese patients ... -
Towards individualized management of bariatric surgery patients
Strømmen, Magnus (Doctoral theses at NTNU;2021:108, Doctoral thesis, 2021)