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Projection screen or video goggles as stimulus modality in functional magnetic resonance imaging
Linköping University, Department of Medical and Health Sciences, Radiology. Linköping University, Center for Medical Image Science and Visualization, CMIV. Linköping University, Faculty of Health Sciences.ORCID iD: 0000-0002-2167-2450
Linköping University, Department of Medical and Health Sciences, Radiology. Linköping University, Center for Medical Image Science and Visualization, CMIV. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medical and Health Sciences, Radiation Physics. Linköping University, Center for Medical Image Science and Visualization, CMIV. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.ORCID iD: 0000-0001-8661-2232
2005 (English)In: Magnetic Resonance Imaging, ISSN 0730-725X, E-ISSN 1873-5894, Vol. 23, no 5, 695-699 p.Article in journal (Refereed) Published
Abstract [en]

The purpose of this study was to investigate the reliability of functional magnetic resonance imaging (fMRI) by using either a projection screen or video goggles as stimulus modality. A sequence of visual stimuli were presented to the same subject at different occasions. The sequence was optimized with a genetic algorithm. In five sessions the stimuli were presented using a projection screen viewed through a mirror in the head coil and in five sessions using video goggles. Failure to detect visual activation in the medial left hemisphere was observed in sessions using the projection screen as stimulus modality. Decreased thresholds for P values and cluster size resulted in activation outside the occipital lobe and did not significantly increase activated areas in this region. Results in this study indicate that presentation of fMRI tasks with visual routes is more reliable with direct input through video goggles than with the conventional use of projection screens. Failure to detect crucial visual areas has severe consequences for tumor surgery in the visual cortex. Inferior visual impression might also have negative consequences for cognitive tests with high demand on attention and perception.

Place, publisher, year, edition, pages
2005. Vol. 23, no 5, 695-699 p.
Keyword [en]
fMRI; Visual; Projection screen; Video goggles; Reliability
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-17992DOI: 10.1016/j.mri.2005.04.006PubMedID: 16051046OAI: oai:DiVA.org:liu-17992DiVA: diva2:213951
Available from: 2009-04-30 Created: 2009-04-30 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Functional Magnetic Resonance Imaging for Clinical Diagnosis: Exploring and Improving the Examination Chain
Open this publication in new window or tab >>Functional Magnetic Resonance Imaging for Clinical Diagnosis: Exploring and Improving the Examination Chain
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Functional Magnetic Resonance Imaging (fMRI) is a relatively new imaging technique, first reported in 1992, which enables mapping of brain functions with high spatial resolution. Functionally active areas are distinguished by a small signal increase mediated by changes in local blood oxygenation in response to neural activity. The ability to non-invasively map brain function and the large number of MRI scanners quickly made the method very popular, and fMRI have had a huge impact on the study of brain function, both in healthy and diseased subjects.

The most common clinical application of fMRI is pre-surgical mapping of brain functions in order to optimise surgical interventions. The clinical fMRI examination procedure can be divided into four integrated parts: (1) patient preparation, (2) image acquisition, (3) image analysis and (4) clinical decision. In this thesis, important aspects of all parts of the fMRI examination procedure are explored with the aim to provide recommendations and methods for prosperous clinical usage of the technique.

The most important results of the thesis were: (I) administration of low doses of diazepam to reduce anxiety did not invalidate fMRI mapping results of primary motor and language areas, (II) the choice of visual stimuli equipment can have severe impact on the mapping of visual areas, (III) three-dimensional fMRI imaging sequences did not perform better than two-dimensional imaging sequences, (IV) adaptive spatial filtering can improve the fMRI data analysis, (V) clinical decisions should not be based on activation results from a single statistical threshold.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2009. 73 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1121
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
urn:nbn:se:liu:diva-18095 (URN)978-91-7393-645-3 (ISBN)
Public defence
2009-06-02, Majoren, Brigaden Restaurang & Konferens, Brigadgatan 17, 587 58 Linköping, Linköping, 09:15 (Swedish)
Opponent
Supervisors
Available from: 2009-05-06 Created: 2009-05-06 Last updated: 2014-10-02Bibliographically approved

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Engström, MariaRagnehed, MattiasLundberg, Peter

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RadiologyCenter for Medical Image Science and Visualization, CMIVFaculty of Health SciencesRadiation PhysicsDepartment of Radiation Physics
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