Geirmund Unsgård

Summary

Affiliation: Norwegian University of Science and Technology
Country: Norway

Publications

  1. doi request reprint Intra-operative imaging with 3D ultrasound in neurosurgery
    Geirmund Unsgård
    Department of Neurosurgery, St Olav University Hospital, Trondheim, Norway
    Acta Neurochir Suppl 109:181-6. 2011
  2. ncbi request reprint Intra-operative 3D ultrasound in neurosurgery
    G Unsgaard
    Department of Neurosurgery, St Olav University Hospital, Trondheim, Norway
    Acta Neurochir (Wien) 148:235-53; discussion 253. 2006
  3. pmc Low grade gliomas in eloquent locations - implications for surgical strategy, survival and long term quality of life
    Asgeir S Jakola
    Department of Neurosurgery, St Olavs University Hospital, Trondheim, Norway
    PLoS ONE 7:e51450. 2012
  4. ncbi request reprint Functional magnetic resonance imaging and diffusion tensor tractography incorporated into an intraoperative 3-dimensional ultrasound-based neuronavigation system: impact on therapeutic strategies, extent of resection, and clinical outcome
    Erik Magnus Berntsen
    Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology, Department of Medical Imaging, St Olavs Hospital, Trondheim, Norway
    Neurosurgery 67:251-64. 2010
  5. pmc Ultrasound imaging in neurosurgery: approaches to minimize surgically induced image artefacts for improved resection control
    Tormod Selbekk
    Department of Medical Technology, SINTEF, PO Box 4760, Sluppen, 7465, Trondheim, Norway
    Acta Neurochir (Wien) 155:973-80. 2013
  6. doi request reprint Navigated resection of giant intracranial meningiomas based on intraoperative 3D ultrasound
    Ole Solheim
    St Olavs University Hospital, Norwegian University of Science and Technology, Trondheim, Norway
    Acta Neurochir (Wien) 151:1143-51. 2009
  7. doi request reprint Ultrasound-guided operations in unselected high-grade gliomas--overall results, impact of image quality and patient selection
    Ole Solheim
    Department of Neuroscience, Norwegian University of Science and Technology, 7005, Trondheim, Norway
    Acta Neurochir (Wien) 152:1873-86. 2010
  8. doi request reprint Surgical strategy in grade II astrocytoma: a population-based analysis of survival and morbidity with a strategy of early resection as compared to watchful waiting
    Asgeir Store Jakola
    Department of Neurosurgery, St Olavs University Hospital, N 7006, Trondheim, Norway
    Acta Neurochir (Wien) 155:2227-35. 2013
  9. ncbi request reprint Comparison of a strategy favoring early surgical resection vs a strategy favoring watchful waiting in low-grade gliomas
    Asgeir S Jakola
    DepartmentofNeurosurgery, St Olavs University Hospital, Trondheim, Norway
    JAMA 308:1881-8. 2012
  10. pmc Postoperative deterioration in health related quality of life as predictor for survival in patients with glioblastoma: a prospective study
    Asgeir S Jakola
    Department of Neurosurgery, St Olavs University Hospital, Trondheim, Norway
    PLoS ONE 6:e28592. 2011

Detail Information

Publications25

  1. doi request reprint Intra-operative imaging with 3D ultrasound in neurosurgery
    Geirmund Unsgård
    Department of Neurosurgery, St Olav University Hospital, Trondheim, Norway
    Acta Neurochir Suppl 109:181-6. 2011
    ..There is no need for special instruments, and no need for radiologists or technicians. It adds very little extra time to the operation, and the investment-costs are considerably lower than for ioMRI...
  2. ncbi request reprint Intra-operative 3D ultrasound in neurosurgery
    G Unsgaard
    Department of Neurosurgery, St Olav University Hospital, Trondheim, Norway
    Acta Neurochir (Wien) 148:235-53; discussion 253. 2006
    ....
  3. pmc Low grade gliomas in eloquent locations - implications for surgical strategy, survival and long term quality of life
    Asgeir S Jakola
    Department of Neurosurgery, St Olavs University Hospital, Trondheim, Norway
    PLoS ONE 7:e51450. 2012
    ..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..
  4. ncbi request reprint Functional magnetic resonance imaging and diffusion tensor tractography incorporated into an intraoperative 3-dimensional ultrasound-based neuronavigation system: impact on therapeutic strategies, extent of resection, and clinical outcome
    Erik Magnus Berntsen
    Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology, Department of Medical Imaging, St Olavs Hospital, Trondheim, Norway
    Neurosurgery 67:251-64. 2010
    ..Functional neuronavigation with intraoperative 3-dimensional (3D) ultrasound may facilitate safer brain lesion resections than conventional neuronavigation...
  5. pmc Ultrasound imaging in neurosurgery: approaches to minimize surgically induced image artefacts for improved resection control
    Tormod Selbekk
    Department of Medical Technology, SINTEF, PO Box 4760, Sluppen, 7465, Trondheim, Norway
    Acta Neurochir (Wien) 155:973-80. 2013
    ..The aim of this paper is to explain the causes of surgically induced ultrasound artefacts and how they can be recognized and reduced...
  6. doi request reprint Navigated resection of giant intracranial meningiomas based on intraoperative 3D ultrasound
    Ole Solheim
    St Olavs University Hospital, Norwegian University of Science and Technology, Trondheim, Norway
    Acta Neurochir (Wien) 151:1143-51. 2009
    ..Neuronavigation based on preoperative imaging can be of limited use as there may be extensive brain shifts during surgery...
  7. doi request reprint Ultrasound-guided operations in unselected high-grade gliomas--overall results, impact of image quality and patient selection
    Ole Solheim
    Department of Neuroscience, Norwegian University of Science and Technology, 7005, Trondheim, Norway
    Acta Neurochir (Wien) 152:1873-86. 2010
    ..Delineation of seemingly similar brain tumours vary in different ultrasound-guided operations, perhaps limiting usefulness in certain patients...
  8. doi request reprint Surgical strategy in grade II astrocytoma: a population-based analysis of survival and morbidity with a strategy of early resection as compared to watchful waiting
    Asgeir Store Jakola
    Department of Neurosurgery, St Olavs University Hospital, N 7006, Trondheim, Norway
    Acta Neurochir (Wien) 155:2227-35. 2013
    ..Astrocytoma represents the largest subgroup of LGG, and is characterized by diffuse growth and inferior prognosis. We aimed to study the effects of early resection compared to biopsy and watchful waiting in this subgroup...
  9. ncbi request reprint Comparison of a strategy favoring early surgical resection vs a strategy favoring watchful waiting in low-grade gliomas
    Asgeir S Jakola
    DepartmentofNeurosurgery, St Olavs University Hospital, Trondheim, Norway
    JAMA 308:1881-8. 2012
    ..There are no controlled studies on surgical treatment of diffuse low-grade gliomas (LGGs), and management is controversial...
  10. pmc Postoperative deterioration in health related quality of life as predictor for survival in patients with glioblastoma: a prospective study
    Asgeir S Jakola
    Department of Neurosurgery, St Olavs University Hospital, Trondheim, Norway
    PLoS ONE 6:e28592. 2011
    ..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 been explored...
  11. pmc Animal study assessing safety of an acoustic coupling fluid that holds the potential to avoid surgically induced artifacts in 3D ultrasound guided operations
    Asgeir S Jakola
    Department of Neurosurgery, St, Olavs University Hospital, Trondheim, N 7006, Norway
    BMC Med Imaging 14:11. 2014
    ..Our research group has developed an acoustic coupling fluid that attenuates ultrasound energy like the normal brain. We aimed to test in animals if the newly developed acoustic coupling fluid may have harmful effects...
  12. pmc Comparison of contrast in brightness mode and strain ultrasonography of glial brain tumours
    Tormod Selbekk
    Department of Medical Technology, SINTEF, Trondheim, Norway
    BMC Med Imaging 12:11. 2012
    ..This study aims to investigate differences in image contrast between ultrasound brightness mode (B-mode) images and ultrasound strain magnitude images of brain tumours...
  13. ncbi request reprint Preoperative blood oxygen level-dependent functional magnetic resonance imaging in patients with primary brain tumors: clinical application and outcome
    Asta Håberg
    Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway
    Neurosurgery 54:902-14; discussion 914-5. 2004
    ....
  14. ncbi request reprint [A 54-year-old man with a large subcutaneous skull erosion and focal epileptic seizures]
    Anne Vik
    Nevrokirurgisk avdeling, St Olavs Hospital, 7006 Trondheim
    Tidsskr Nor Laegeforen 126:2386-7. 2006
    ..Extracranial metastases from meningioma are rare, and are reported to occur in less than 1 per 1000...
  15. pmc Surgically acquired deficits and diffusion weighted MRI changes after glioma resection - a matched case-control study with blinded neuroradiological assessment
    Asgeir S Jakola
    Department of Neurosurgery, St Olavs University Hospital, Trondheim, Norway MI Lab, Norwegian University of Science and Technology, Trondheim, Norway National Centre for Ultrasound and Image Guided Therapy, Trondheim, Norway
    PLoS ONE 9:e101805. 2014
    ..e. infarctions) detected by diffusion weighted resonance imaging (DWI) in patients with surgically acquired neurological deficits compared to controls...
  16. doi request reprint Quality of life in patients with intracranial gliomas: the impact of modern image-guided surgery
    Asgeir S Jakola
    Department of Neurosurgery, St Olavs University Hospital, Trondheim, Norway
    J Neurosurg 114:1622-30. 2011
    ..In the present study the authors aimed to assess changes in QOL after glioma surgery, to explore the relationship between QOL and traditional outcome parameters, and to examine possible predictors of change in QOL...
  17. doi request reprint Intrasellar ultrasound in transsphenoidal surgery: a novel technique
    Ole Solheim
    Department of Neuroscience, Norwegian University of Science and Technology, Department of Neurosurgery, St Olavs University Hospital, Trondheim, Norway
    Neurosurgery 66:173-85; discussion 185-6. 2010
    ..We aimed to investigate a new technical solution developed for intraoperative ultrasound imaging during transsphenoidal surgery, with respect to potential clinical use and the ability to identify neuroanatomy and tumor...
  18. ncbi request reprint Intra-operative correction of brain-shift
    Ingerid Reinertsen
    SINTEF, Medical Technology, P B 4760 Sluppen, 7465, Trondheim, Norway
    Acta Neurochir (Wien) 156:1301-10. 2014
    ..Brain-shift is a major source of error in neuronavigation systems based on pre-operative images. In this paper, we present intra-operative correction of brain-shift using 3D ultrasound...
  19. ncbi request reprint Pentylenetetrazole decreases metabolic glutamate turnover in rat brain
    Haytham Eloqayli
    Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway
    J Neurochem 85:1200-7. 2003
    ..Aspartate turnover was also decreased in all brain regions. Changes in astrocyte metabolism were not detected, indicating that PTZ had no effect on astrocyte metabolism in the early postictal stage...
  20. ncbi request reprint Functional neuronavigation combined with intra-operative 3D ultrasound: initial experiences during surgical resections close to eloquent brain areas and future directions in automatic brain shift compensation of preoperative data
    I A Rasmussen
    Norwegian University of Science and Technology, Trondheim, Norway
    Acta Neurochir (Wien) 149:365-78. 2007
    ..2) To develop and demonstrate a co-registration method for automatic brain-shift correction of pre-operative MR data using intra-operative 3D ultrasound...
  21. ncbi request reprint Endoscopy guided by an intraoperative 3D ultrasound-based neuronavigation system
    O M Rygh
    Department of Neurosurgery, St Olav University Hospital, Trondheim, Norway
    Minim Invasive Neurosurg 49:1-9. 2006
    ..We have investigated the feasibility of using 3D ultrasound-based neuronavigation for guiding neuroendoscopy...
  22. ncbi request reprint Ability of navigated 3D ultrasound to delineate gliomas and metastases--comparison of image interpretations with histopathology
    G Unsgaard
    Department of Neurosurgery, St Olav University Hospital, Trondheim, Norway
    Acta Neurochir (Wien) 147:1259-69; discussion 1269. 2005
    ..The system also enabled concomitant comparison of navigated preoperative MR with histopathology...
  23. ncbi request reprint Stereoscopic navigation-controlled display of preoperative MRI and intraoperative 3D ultrasound in planning and guidance of neurosurgery: new technology for minimally invasive image-guided surgery approaches
    T A Nagelhus Hernes
    SINTEF Unimed, Medical Technical Research Centre, Trondheim, Norway
    Minim Invasive Neurosurg 46:129-37. 2003
    ..We demonstrate the practical use of an in-house interactive stereoscopic visualization module that is integrated with a 3D ultrasound based neuronavigation system...
  24. ncbi request reprint Clinical validation of vessel-based registration for correction of brain-shift
    I Reinertsen
    Montreal Neurological Institute MNI, McGill University, Montreal, Canada
    Med Image Anal 11:673-84. 2007
    ..Pre-processing of the data can be completed in 30 s per dataset, and registrations can be performed in less than 30s. This makes the technique well suited for intra-operative use...
  25. ncbi request reprint Quality of life after treatment for incidental, unruptured intracranial aneurysms
    O Solheim
    Department of Neurosurgery, St Olav University Hospital, Trondheim, Norway
    Acta Neurochir (Wien) 148:821-30; discussion 830. 2006
    ..We aimed to compare the quality of life and symptoms of anxiety or depression after endovascular coiling or open surgery clipping of unruptured intracranial aneurysms, in patients with no prior subarachnoid haemorrhage...