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Sjöqvist, Stefan
Alternative names
Publications (10 of 12) Show all publications
Szabó, Z., Sjökvist, S., Gustavsson, T., Carleberg, P., Uppsäll, M., Wren, J., . . . Smedby, Ö. (2013). Intraoperativ visualisering av myokardiell perfusion i realtidmeaugmented reality temperatur monitorering-en experimentellstudie. In: : . Paper presented at Thoraxmötet, 16-18 oktober 2013, Linköping (pp. O2-O2).
Open this publication in new window or tab >>Intraoperativ visualisering av myokardiell perfusion i realtidmeaugmented reality temperatur monitorering-en experimentellstudie
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2013 (Swedish)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-99977 (URN)
Conference
Thoraxmötet, 16-18 oktober 2013, Linköping
Available from: 2013-10-24 Created: 2013-10-24 Last updated: 2013-11-05
Szabó, Z., Berg, S., Sjökvist, S., Gustafsson, T., Carleberg, P., Uppsäll, M., . . . Smedby, Ö. (2013). Real-time intraoperative visualization of myocardial circulation using augmented reality terperature display. The International Journal of Cardiovascular Imaging, 29(2), 521-528
Open this publication in new window or tab >>Real-time intraoperative visualization of myocardial circulation using augmented reality terperature display
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2013 (English)In: The International Journal of Cardiovascular Imaging, ISSN 1569-5794, E-ISSN 1875-8312, Vol. 29, no 2, p. 521-528Article in journal (Refereed) Published
Abstract [en]

For direct visualization of myocardial ischemia during cardiac surgery, we tested the feasibility of presenting infrared (IR) tissue temperature maps in situ during surgery. A new augmented reality (AR) system, consisting of an IR camera and an integrated projector having identical optical axes, was used, with a high resolution IR camera as control. The hearts of five pigs were exposed and an elastic band placed around the middle of the left anterior descending coronary artery to induce ischemia. A proximally placed ultrasound Doppler probe confirmed reduction of flow. Two periods of complete ischemia and reperfusion were studied in each heart. There was a significant decrease in IR-measured temperature distal to the occlusion, with subsequent return to baseline temperatures after reperfusion (baseline 36.9 ± 0.60 (mean ± SD) versus ischemia 34.1 ± 1.66 versus reperfusion 37.4 ± 0.48; p < 0.001), with no differences occurring in the non-occluded area. The AR presentation was clear and dynamic without delay, visualizing the temperature changes produced by manipulation of the coronary blood flow, and showed concentrically arranged penumbra zones during ischemia. Surface myocardial temperature changes could be assessed quantitatively and visualized in situ during ischemia and subsequent reperfusion. This method shows potential as a rapid and simple way of following myocardial perfusion during cardiac surgery. The dynamics in the penumbra zone could potentially be used for visualizing the effect of therapy on intraoperative ischemia during cardiac surgery.

Place, publisher, year, edition, pages
Springer, 2013
Keywords
Augmented reality – Mixed reality – Myocardium – Ischemia – Infrared thermometry – Visualization
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-80802 (URN)10.1007/s10554-012-0094-5 (DOI)000314285500030 ()
Available from: 2012-08-30 Created: 2012-08-30 Last updated: 2017-12-07
Szabó, Z., Sjökvist, S., Gustafsson, T., Uppsäll, M., Wren, J., Berg, S., . . . Smedby, Ö. (2010). Real-time intraoperative visualization of myocardial circulation by augmented reality temperature display. In: Minimally invasive therapy and allied technologies: . Paper presented at 22nd International Conference of the Society for Medical Innovation and Technology (SMIT), 2-4 September 2010, Trondheim, Norway (pp. 61-61). Informa Healthcare
Open this publication in new window or tab >>Real-time intraoperative visualization of myocardial circulation by augmented reality temperature display
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2010 (English)In: Minimally invasive therapy and allied technologies, Informa Healthcare, 2010, p. 61-61Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Background:  Intraoperative  ischemia   during   coronary   surgery   may   have   severe   consequences   for the patient and may also pose a difficult diagnostic problem  to the  surgeon.  There  is no  clinically used direct  method  to evaluate  the  effect on  the  circulation of various therapeutic maneuvers  to the heart. Augmented (mixed)  reality using projection  of color- coded  infra-red  (IR)  images onto  the imaged  tissues in real  time  may  give an  intuitive  representation of the tissue surface temperature and thus,  information about   myocardial   perfusion   on  the  surface  of  the organ itself.

Purpose:  To demonstrate in animal experiments the feasibility of presenting  IR tissue temperature images  reflecting  myocardial  perfusion into  the  surgical  field  with  augmented reality.

Method: We  have  constructed a  system  consisting of an IR camera  and  a projector  integrated in such a way that  they  have  identical  optical  axes,  solving the  geometrical  correspondence problem  in an easy way. In 5 pigs (weight = 57.5 ± 7 kg), the thorax was opened    by   median    sternotomy.   After   exposing the  heart,  an  elastic  vessel loop  was placed  around the  middle  of  the  left  descending  coronary  artery. A  2  mm   ultrasound  probe   was  inserted   distally around the LAD for flow velocity measurements. Subsequent ischemia-reperfusion periods  were induced using a fixed protocol. 

Results:  The  time course of  an   occlusion   was  clearly  seen   in  quantitative curves  as well as in  color-coded temperature  maps on the surface of the heart.  The  difference in surface temperature between the three areas more or less affected  by  the  ischemia   was  also  clearly  demon- strated.  During  ischemia,  the surface of the myocardium  showed  concentrically  arranged  zones  of different temperatures (IR penumbra) potentially cor- responding to different  degrees  of severity of ischemia. 

Conclusion: Surface  temperature changes  due to ischemia can be assessed quantitatively and visualized  in situ during occlusion of a coronary  artery and   subsequent  reperfusion of  the myocardium. This method shows potential  as  a  fast  and  simple way of  following  myocardial  perfusion  during surgery. The  change  of the  extension  of the  penumbra zone  is a potential monitoring device  for the  thera- pies used  in the salvage or prevention of ischemia  in experimental or clinical cardiac surgery and may introduce new practices in monitoring  duringcardiac  and vascular anesthesia.

Place, publisher, year, edition, pages
Informa Healthcare, 2010
Series
Minimally Invasive Therapy, ISSN 1364-5706 ; 19 Suppl 1
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-93659 (URN)10.3109/13645706.2010.500867 (DOI)
Conference
22nd International Conference of the Society for Medical Innovation and Technology (SMIT), 2-4 September 2010, Trondheim, Norway
Available from: 2013-06-05 Created: 2013-06-05 Last updated: 2014-03-06Bibliographically approved
Linderhed, A., Sjöqvist, S., Nyberg, S. & Uppsäll, M. (2005). Land mine detection by IR temporal analysis: detection methods. In: SPIE defence and security symposium,2005. Orlando, Florida, USA: SPIE the international society for optical engineering
Open this publication in new window or tab >>Land mine detection by IR temporal analysis: detection methods
2005 (English)In: SPIE defence and security symposium,2005, Orlando, Florida, USA: SPIE the international society for optical engineering , 2005Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Orlando, Florida, USA: SPIE the international society for optical engineering, 2005
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-31631 (URN)17437 (Local ID)17437 (Archive number)17437 (OAI)
Available from: 2009-10-09 Created: 2009-10-09
Sjöqvist, S., Linderhed, A., Nyberg, S., Uppsäll, M. & Loyd, D. (2005). Land mine detection by IR temporal analysis; physical numerical modeling. In: SPIE defence and security symposium,2005. Orlando, Florida, USA: SPIE the international society for optical engineering
Open this publication in new window or tab >>Land mine detection by IR temporal analysis; physical numerical modeling
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2005 (English)In: SPIE defence and security symposium,2005, Orlando, Florida, USA: SPIE the international society for optical engineering , 2005Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Orlando, Florida, USA: SPIE the international society for optical engineering, 2005
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-31635 (URN)17441 (Local ID)17441 (Archive number)17441 (OAI)
Available from: 2009-10-09 Created: 2009-10-09
Sjöqvist, S., Abrahamson, S., Andersson, P., Chevalier, T., Forssell, G., Grönvall, C., . . . Uppsäll, M. (2005). MOMS Multi Optical Mine Detection System, Initial report. Linköping: FOI, Linköping
Open this publication in new window or tab >>MOMS Multi Optical Mine Detection System, Initial report
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2005 (English)Report (Other academic)
Place, publisher, year, edition, pages
Linköping: FOI, Linköping, 2005
Series
LiTH-IKP-R ; 1399
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-31646 (URN)17453 (Local ID)17453 (Archive number)17453 (OAI)
Available from: 2009-10-09 Created: 2009-10-09
Linderhed, A., Sjöqvist, S., Nyberg, S., Uppsäll, M., Grönvall, C., Andersson, P. & Letalick, D. (2005). Temporal analysis for land mine detection. In: 4th international symposium on image and signal processing and analysis,2005.
Open this publication in new window or tab >>Temporal analysis for land mine detection
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2005 (English)In: 4th international symposium on image and signal processing and analysis,2005, 2005Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-31621 (URN)17427 (Local ID)17427 (Archive number)17427 (OAI)
Available from: 2009-10-09 Created: 2009-10-09
Nelsson, C., Forsell, G., Hermansson, P., Hjelm, A., Hedborg-Karlsson, E. & Sjöqvist, S. (2004). A database of materal properties for optical signature modelling. Linköping: Linköpings universitet
Open this publication in new window or tab >>A database of materal properties for optical signature modelling
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2004 (English)Report (Other academic)
Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2004
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-37257 (URN)34088 (Local ID)34088 (Archive number)34088 (OAI)
Available from: 2009-10-10 Created: 2009-10-10
Nelsson, C., Lindell, R., Sjöqvist, S. & Winzell, T. (2004). Ground Truth. Linköping: SEMARK
Open this publication in new window or tab >>Ground Truth
2004 (English)Report (Other academic)
Place, publisher, year, edition, pages
Linköping: SEMARK, 2004
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-37240 (URN)34064 (Local ID)34064 (Archive number)34064 (OAI)
Available from: 2009-10-10 Created: 2009-10-10
Linderhed, A., Nyberg, S., Sjöqvist, S. & Uppsäll, M. (2004). Optical Methods for Detection of Minefields. Linköping: Linköpings universitet
Open this publication in new window or tab >>Optical Methods for Detection of Minefields
2004 (English)Report (Other academic)
Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2004
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-37235 (URN)34055 (Local ID)34055 (Archive number)34055 (OAI)
Available from: 2009-10-10 Created: 2009-10-10
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