Blar i NTNU Open på forfatter "Unsgård, Geirmund"
-
A new acoustic coupling fluid with ability to reduce ultrasound imaging artefacts in brain tumour surgery - a phase I study
Unsgård, Geirmund; Sagberg, Lisa Millgård; Muller, Sebastien; Selbekk, Tormod (Journal article; Peer reviewed, 2019)Background Anovel acoustic coupling fluid (ACF), with the potential to reduce surgically induced image artefacts during intraoperative ultrasound imaging in brain tumour surgery, has been evaluated with respect to image ... -
Animal study assessing safety of an acoustic coupling fluid that holds the potential to avoid surgically induced artifacts in 3D ultrasound guided operations
Jakola, Asgeir S; Jørgensen, Arve; Selbekk, Tormod; Michler, Ralf-Peter; Solheim, Ole; Torp, Sverre Helge; Sagberg, Lisa Millgård; Aadahl, Petter; Unsgård, Geirmund (Journal article; Peer reviewed, 2014)Background Use of ultrasound in brain tumor surgery is common. The difference in attenuation between brain and isotonic saline may cause artifacts that degrade the ultrasound images, potentially affecting resection grades ... -
Automatic Intraoperative Correction of Brain Shift for Accurate Neuronavigation
Iversen, Daniel Høyer; Wein, Wolfgang; Lindseth, Frank; Unsgård, Geirmund; Reinertsen, Ingerid (Journal article; Peer reviewed, 2018)Background Unreliable neuronavigation owing to inaccurate patient-to-image registration and brain shift is a major problem in conventional magnetic resonance imaging–guided neurosurgery. We performed a prospective ... -
Automatic intraoperative estimation of blood flow direction during neurosurgical interventions
Iversen, Daniel Høyer; Løvstakken, Lasse; Unsgård, Geirmund; Reinertsen, Ingerid (Journal article; Peer reviewed, 2018)Purpose In neurosurgery, reliable information about blood vessel anatomy and flow direction is important to identify, characterize, and avoid damage to the vasculature. Due to ultrasound Doppler angle dependencies and the ... -
Comparison of contrast in brightness mode and strain ultrasonography of glial brain tumours
Selbekk, Tormod; Brekken, Reidar; Indergaard, Marit Kristina; Solheim, Ole; Unsgård, Geirmund (Journal article; Peer reviewed, 2012)Background Image contrast between normal tissue and brain tumours may sometimes appear to be low in intraoperative ultrasound. Ultrasound imaging of strain is an image modality that has been recently explored for ... -
Intraoperative 3D ultrasound-guided resection of diffuse low-grade gliomas: radiological and clinical results.
Bø, Hans Kristian; Solheim, Ole; Kvistad, Kjell Arne; Berntsen, Erik Magnus; Torp, Sverre Helge; Skjulsvik, Anne Jarstein; Reinertsen, Ingerid; Iversen, Daniel Høyer; Unsgård, Geirmund; Jakola, Asgeir S (Peer reviewed; Journal article, 2019)OBJECTIVE Extent of resection (EOR) and residual tumor volume are linked to prognosis in low-grade glioma (LGG) and there are various methods for facilitating safe maximal resection in such patients. In this prospective ... -
Low Grade Gliomas in Eloquent Locations – Implications for Surgical Strategy, Survival and Long Term Quality of Life
Jakola, Asgeir S; Unsgård, Geirmund; Myrmel, Kristin Smistad; Kloster, Roar; Torp, Sverre Helge; Lindal, Sigurd; Solheim, Ole (Journal article; Peer reviewed, 2012)Background: Surgical management of suspected LGG remains controversial. A key factor when deciding a surgical strategy is often the tumors’ perceived relationship to eloquent brain regions Objective: To study the association ... -
Postoperative deterioration in health related quality of life as predictor for survival in patients with glioblastoma: a prospective study
Jakola, Asgeir S; Gulati, Sasha; Weber, Clemens; Unsgård, Geirmund; Solheim, Ole (Journal article; Peer reviewed, 2011)Background: Studies indicate that acquired deficits negatively affect patients' self-reported health related quality of life (HRQOL) and survival, but the impact of HRQOL deterioration after surgery on survival has not ... -
Surgically acquired deficits and diffusion weighted MRI changes after glioma resection - A matched case-control study with blinded neuroradiological assessment
Jakola, Asgeir S; Berntsen, Erik Magnus; Christensen, Pål; Gulati, Sasha; Unsgård, Geirmund; Kvistad, Kjell Arne; Solheim, Ole (Journal article; Peer reviewed, 2014)Background: Acquired deficits following glioma resection may not only occur due to accidental resection of normal brain tissue. The possible importance of ischemic injuries in causing neurological deficits after brain ... -
The diagnostic properties of intraoperative ultrasound in glioma surgery and factors associated with gross total tumor resection
Munkvold, Bodil Karoline Ravn; Jakola, Asgeir Store; Reinertsen, Ingerid; Sagberg, Lisa Millgård; Unsgård, Geirmund; Solheim, Ole (Journal article; Peer reviewed, 2018)Objective In glioma operations, we sought to analyze sensitivity, specificity, and predictive values of intraoperative 3-dimensional ultrasound (US) for detecting residual tumor compared with early postoperative magnetic ...