Institut for Elektro- og Computerteknologi

Aarhus Universitets segl

Publications

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Nygaard, H., Johansen, P., Riis, C., Hasenkam, J. M. & Paulsen, P. K. (1999). Assessment of perceived mechanical heart valve sound level in patients. Journal of Heart Valve Disease, 8(6), 655-661.
Johansen, P., Riis, C., Hasenkam, J. M., Paulsen, P. K. & Nygaard, H. (2000). A new method for quantitative evaluation of perceived sounds from mechanical heart valve prostheses. Proc Inst Medch Eng, 214(1), 121-128.
Johansen, P., Lomholt, M. & Nygaard, H. (2002). Spectral characteristics of mechanical heart valve closing sounds. Journal of Heart Valve Disease, 11(5), 736-744.
Johansen, P., Fontaine, A. A., Deutsch, S., Manning, K. B., Nygaard, H. & Tarbell, J. M. (2003). A new method for evaluation of cavitation near mechanical heart valves. Journal of Biomechanical Engineering, 125(5), 663-670.
Johansen, P., Travis, B. R., Paulsen, P. K., Nygaard, H. & Hasenkam, J. M. (2003). Cavitaion caused by mechanical heart valve prosthesis: A review. Acta Pathologica Microbiologica et Immunologica Scandinavica, (109), 108-112.
Andersen, T. S., Johansen, P., Paulsen, P. K., Nygaard, H. & Hasenkam, J. M. (2003). Indication of cavitation in mechanical heart valve patients. J Heart Valve Dis, 12(6), 790-796.
Johansen, P., Hansen, S. B., Hasenkam, J. M. & Nygaard, H. (2003). Noise levels of closing sounds in vivo are equal for different bileaflet mechanical heart valves. Journal of Heart Valve Disease, 12(6), 764-771.
Sørensen, B., Johansen, P., Nielsen, G. L., Sørensen, J. C. & Ingerslev, J. (2003). Reversal of the International Normalized Ratio with recombinant activated factor VII in central nervous system bleeding during warfarin thromboprophylaxis: clinical and biochemical aspects. Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis, 14(5), 469-77. https://doi.org/10.1097/01.mbc.0000061332.06975.47
Sørensen, B., Johansen, P. & Ingerslev, J. (2003). Whole blood coagulation thromboelastographic profiles employing minimal tissue factor activation. Journal of Thrombosis and Haemostasis, 1(3), 551-558.
Johansen, P., Andersen, T. S., Hasenkam, J. M. & Nygaard, H. (2004). In vivo prediction of cavitation near a Medtronic Hall valve. Journal of Heart Valve Disease, 13(4), 651-658.
Johansen, P. (2004). Mechanical Heart Valve Cavitation. Expert Review of Medical Devices, 1(1), 95-104.
Johansen, P. (2004). Quantification of Cavitation in the Vicinity of Mechanical Heart Valves.
Johansen, P., Søgaard, H., Morgenstjerne, O. R., Hasenkam, J. M. & Nygaard, H. (2005). Assessment of Mechanical Heart Valve Integrity in patients using acoustic techniques requires ultrahigh frequency bandwidth high fidelity microphones. Poster-session præsenteret på The 3rd European Medical & Biological Engineering Conference, Prag, Tjekkiet.
Johansen, P., Andersen, T. S., Hasenkam, J. M. & Nygaard, H. (2005). Mechanical heart valve cavitation in bileaflet valves. Abstract fra First International Conference on Mechanics of Biomaterials & Tissues, Waikoloa, USA.
Johansen, P., Søgaard, H., Morgenstjerne, O., Hasenkam, J. M. & Nygaard, H. (2005). Mechanical heart valve integrity in patients assessed using acoustic techniques requires ultrahigh frequency high fidelity microphones. Poster-session præsenteret på New Era2005 Cardiac Care: Innovation & Technology, Dana Point, USA.
Nielsen, T., Nielsen, T. V., Johansen, P., Hasenkam, J. M. & Nygaard, H. (2005). Psychoacoustic Quantification of Mechanical Heart Valve Noise. Journal of Heart Valve Disease, 14(1), 89-95.
Bieniek, J. M., Ng, H. S., Manning, K. B., Fontaine, A. A., Johansen, P. & Deutsch, S. (2005). Stable Bubble Release from Mechanical Heart Valves in a Mock Circulatory Loop. Poster-session præsenteret på 51st Annual Conference in the American Society for Artificial Internal Organs, Washington, USA.
Sørensen, B., Larsen, L. H., Andersen, L., Johansen, P., Poulsen, L. H. & Ingerslev, J. (2005). Visualization of Dynamic Fibrin Formation from APTT Recordings Reflects more Heterogeneity in Patients with severe Haemophilia A than Conventional APTT Values. Poster-session præsenteret på The International Society on Thrombosis and Haemostasis XXth Congress and 51st Annual SSC Meeting, Sydney, Australien.
Sørensen, B., Christiansen, K., Andersen, L., Larsen, L. H., Norengaard, L., Poulsen, L. H., Johansen, P. & Ingerslev, J. (2005). Visualization of the Continuous APPT Coagulation Signature - Methods and Correlations to Continuous Thrombin Generation. Poster-session præsenteret på The International Society on Thrombosis & Haemostasis XXth Congress and 51st Annual SSC Meeting, Sydney, Australien.
Ng, H. S., Nygaard, H., Hasenkam, J. M. & Johansen, P. (2005). Visual verification of emboli detection (size and count)using Doppler ultrasound and wavelet transform. Poster-session præsenteret på 15th Annual Meeting of The Scandinavian Society for Research in CardioThoracic Surgery, Geilo, Norge.
Ng, H. S., Nygaard, H., Hasenkam, J. M. & Johansen, P. (2005). Visual Verification of Emboli Detection Using Doppler Ultrasound and Wavelet Transform. Poster-session præsenteret på Third Biennial Meeting of The Society for Heart Valve Disease, Vancouver, Canada.
Sørensen, B., Johansen, P., Christiansen, K., Norengaard, L., Larsen, O. H. & Ingerslev, J. (2005). What the Standard APTT Didn't Tell You - Dynamic Plasma Clotting Parameters Reveal Hypercoagulation. Poster-session præsenteret på 47th ASH Annual Meeting and Exposition, Atlanta, USA.
Jensen, M. Ø. J., Nielsen, S. L., Smerup, M. H., Johansen, P., Yoganathan, A. P., Hasenkam, J. M. & Nygaard, H. (2006). 3D Geometry and Stress Distribution in Mitral Valve Annuloplasty Rings. Poster-session præsenteret på 16th Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norge.
Ng, H. S., Johansen, P., Nygaard, H. & Hasenkam, J. M. (2006). Embolic Signal Detection Using Continuous and Discrete Wavelet Transform. Abstract fra Advances in Innovative Technologies and Tissue Engineering for the Treatment of Heart Valve Disease, Hilton Head, USA.
Ng, H. S., Johansen, P., Nygaard, H. & Hasenkam, J. M. (2006). Embolic Signal Detection Using Continuous and Discrete Wavelet Transform. Poster-session præsenteret på Advances in Innovative Technologies and Tissue Engineering for the Treatment of Heart Valve Disease, Hilton Head, USA.
Andersen, T. S., Johansen, P., Christensen, B. O., Paulsen, P. K., Nygaard, H. & Hasenkam, J. M. (2006). Intraoperative and Postoperative Evaluation of Cavitation in Mechanical Heart Valve Patients. The Annals of Thoracic Surgery, 81, 34-41.
Jensen, M. Ø. J., Nielsen, S. L., Smerup, M. H., Jensen, H., Johansen, P., Yoganathan, A. P., Hasenkam, J. M. & Nygaard, H. (2006). New Insight into the Force Balance in the Mitral Valve Annulus. Poster-session præsenteret på The 55th Annual Meeting of the Scandinavian Association for Thoracic Surgery & The 26th Annual Meeting of the Scandinavian Society for Extracorporeal Technology, Reykjavik, Island.
Jensen, M. Ø. J., Nielsen, S. L., Smerup, M. H., Johansen, P., Jensen, H., A.P., Y., Hasenkam, J. M. & Nygaard, H. (2006). New Insight into the Mitral Valve Force Balance. Abstract fra Biomedical Engineering Society Annual Meeting, Chicago, USA.
Pedersen, T. A., Nygaard, H., Johansen, P., Körtke, H. & Hasenkam, J. M. (2006). Patient's perception of mechanical heart valve sounds: psychoacoustics and quality of life. Poster-session præsenteret på 16th Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norge.
Pedersen, T. A., Nygaard, H., Johansen, P., Körtke, H. & Hasenkam, J. M. (2006). Patient's perception of mechanical heart valve sounds: psychoacoustics and quality of life. Abstract fra 16th Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norge.
Jensen, M. Ø. J., Nielsen, S. L., Smerup, M. H., Johansen, P., Jensen, H., Yoganathan, A. P., Hasenkam, J. M. & Nygaard, H. (2006). Stress Distribution and 3D Geometry in Mitral Valve Annuloplasty Rings: Ring Selection Implications. Abstract fra 10th Annual Meeting. Advances in Innovative Technologies and Tissue Engineering for the Treatment of Heart Valve Disease, Hilton Head, USA.
Jensen, M. Ø. J., Nielsen, S. L., Smerup, M. H., Johansen, P., Jensen, H., Yoganathan, A. P., Hasenkam, J. M. & Nygaard, H. (2006). Stress Distribution and 3D Geometry in Mitral Valve Annuloplasty Rings: Ring Selection Implications. Poster-session præsenteret på 10th Annual Meeting. Advances in Innovative Technologies and Tissue Engineering for the Treatment of Heart Valve Disease, Hilton Head, USA.
Jensen, M. Ø. J., Nielsen, S. L., Smerup, M. H., Johansen, P., Yoganathan, A. P., Hasenkam, J. M. & Nygaard, H. (2006). The Effect of Mitral Annuloplasty Rings on Mitral Valve 3D Geometry and Stress Distribution. Poster-session præsenteret på PhD Day, University of Aarhus, Århus, Danmark.
Johansen, P., Ng, H. S., Travis, B. R., Smerup, M. H., Funder, J. A., Nyboe, C., Nygaard, H. & Hasenkam, J. M. (2006). The effect of the aortic valve orientation on cavitation. Poster-session præsenteret på The 10th Annual Hilton Head Workshop and 2nd Biennial Heart Valve Meeting: Advances in Innovative Technologies and Tissue Engineering for the Treatment of Heart Valve Disease, Hilton Head Island, USA.
Johansen, P., Ng, H. S., Travis, B. R., Smerup, M. H., Funder, J. A., Nyboe, C., Nygaard, H. & Hasenkam, J. M. (2006). The effect of the aortic valve position on cavitation. Poster-session præsenteret på 16th Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norge.
Ng, H. S., Johansen, P., Nygaard, H. & Hasenkam, J. M. (2006). Visual Verification of Emboli Detection Using Doppler Ultrasound and Wavelet Transform. Poster-session præsenteret på International Symposium on Cardiovascular & Neurovascular Medicine in conjunction with International Heart Failure Symposium, Hongkong, Hong Kong.
Ng, H. S., Johansen, P., Nygaard, H. & Hasenkam, J. M. (2006). Visual Verification of Emboli Detection Using Doppler Ultrasound and Wavelet Transform. Abstract fra International Symposium on Cardiovascular & Neurovascular Medicine in conjunction with International Heart Failure Symposium, Hongkong, Hong Kong.
Pedersen, T. A., Johansen, P., Hasenkam, J. M., Körfer, R., Körtke, H. & Nygaard, H. (2007). Are sounds from mechanical heart valves equal for different valve types?. Abstract fra 4th Biennial Meeting of The Society for Heart Valve Disease, New York, USA.
Pedersen, T. A., Johansen, P., Hasenkam, J. M., Körfer, R., Körtke, H. & Nygaard, H. (2007). Are sounds from mechanical heart valves equal for different  valve types?. Poster-session præsenteret på Fourth Biennial Meeting of The Society for Heart Valve Disease, New York, USA.
Travis, B. R., Nyboe, C., Christensen, T. D., Smerup, M. H., Johansen, P., Nygaard, H. & Hasenkam, J. M. (2007). Changes in Turbulence With Rotation of the Omnicarbon Prosthesis. ASAIO, 53, 410-414.
Jensen, M. Ø. J., Jensen, H., Nielsen, S. L., Smerup, M. H., Johansen, P., Yoganathan, A. P., Nygaard, H. & Hasenkam, J. M. (2007). Force Balance in the Mitral Valve Annulus: New Results from Novel Modalities and Measurement Techniques. Poster-session præsenteret på 17th Annual Meeting of the Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norge.
Ng, H. S., Nygaard, H., Hasenkam, J. M. & Johansen, P. (2007). Gaseous emboli detection based on a dual-wavelet transform analysis. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 221(6), 687-698.
Jensen, M. Ø. J., Jensen, H., Nielsen, S. L., Smerup, M. H., Johansen, P., Yoganathan, A. P., Nygaard, H. & Hasenkam, J. M. (2007). How to interpret the function of annuloplasty devices.. Abstract fra 4th Biennial Meeting of The Society for Heart Valve Disease, New York, USA.
Johansen, P., Andersen, T. S., Hasenkam, J. M., Nygaard, H. & Paulsen, P. K. (2007). Mechanical heart valve cavitation in patients with bileaflet valves. Poster-session præsenteret på 17th  Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norge.
Pedersen, T. A. L., Johansen, P., Hasenkam, J. M., Koerfer, R., Koertke, H. & Nygaard, H. (2008). Are sounds from mechanical heart valves equal for different valve types? Journal of Heart Valve Disease, 17(5), 579-82.
Jensen, M. Ø. J., Johansen, P. & Nygaard, H. (2008). Development of an implantable heart valve force transducer. I Proceedings of the ASME 2008 Summer Bioengineering Conference
Ng, H. S., Hao, Q., Leung, T., Lawrence Wong, K. S., Nygaard, H., Hasenkam, J. M. & Johansen, P. (2008). Embolic Doppler ultrasound signal detection using continuous wavelet transform to detect multiple vascular emboli. Journal of Neuroimaging, 18(4), 388-95. https://doi.org/10.1111/j.1552-6569.2007.00211.x
Ng, H. S., Nygaard, H., Johansen, P., Hasenkam, J. M., Wong, K., Hao, Q. & Leung, T. (2008). Embolic Signals Detection Using Continuous Wavelet Transform Capable of Multiple Emboli Detection. Poster-session præsenteret på BMES Annual Fall Meeting, Los Angeles, USA.
Jensen, M. Ø. J., Jensen, H., Nielsen, S. L., Smerup, M. H., Johansen, P., Yoganathan, A. P., Nygaard, H. & Hasenkam, J. M. (2008). What Forces Act on a Flat Rigid Mitral Annuloplasty Ring? Journal of Heart Valve Disease, 17, 267-275.
Johansen, P., Sørensen, L., Christensen, J. & Funder, J. A. (2009). A new dielectric electro active polymer based strain transducer for measuring local forces in the heart valves. Poster-session præsenteret på 19th Annual Meeting of the Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norge.

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Revideret 23.01.2026
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Peter Johansen