Department of Electrical and Computer Engineering

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 Department of Electrical and Computer Engineering Research Key areas in research & development Biomedical Engineering Research Groups Cardiovascular Instrumentation and Devices Publications

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 presented at The 3rd European Medical & Biological Engineering Conference, Prag, Czech Republic.
Johansen, P., Andersen, T. S., Hasenkam, J. M. & Nygaard, H. (2005). Mechanical heart valve cavitation in bileaflet valves. Abstract from First International Conference on Mechanics of Biomaterials & Tissues, Waikoloa, United States.
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 presented at New Era2005 Cardiac Care: Innovation & Technology, Dana Point, United States.
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 presented at 51st Annual Conference in the American Society for Artificial Internal Organs, Washington, United States.
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 presented at The International Society on Thrombosis and Haemostasis XXth Congress and 51st Annual SSC Meeting, Sydney, Australia.
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 presented at The International Society on Thrombosis & Haemostasis XXth Congress and 51st Annual SSC Meeting, Sydney, Australia.
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 presented at 15th Annual Meeting of The Scandinavian Society for Research in CardioThoracic Surgery, Geilo, Norway.
Ng, H. S., Nygaard, H., Hasenkam, J. M. & Johansen, P. (2005). Visual Verification of Emboli Detection Using Doppler Ultrasound and Wavelet Transform. Poster session presented at 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 presented at 47th ASH Annual Meeting and Exposition, Atlanta, United States.
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 presented at 16th Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norway.
Ng, H. S., Johansen, P., Nygaard, H. & Hasenkam, J. M. (2006). Embolic Signal Detection Using Continuous and Discrete Wavelet Transform. Abstract from Advances in Innovative Technologies and Tissue Engineering for the Treatment of Heart Valve Disease, Hilton Head, United States.
Ng, H. S., Johansen, P., Nygaard, H. & Hasenkam, J. M. (2006). Embolic Signal Detection Using Continuous and Discrete Wavelet Transform. Poster session presented at Advances in Innovative Technologies and Tissue Engineering for the Treatment of Heart Valve Disease, Hilton Head, United States.
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 presented at The 55th Annual Meeting of the Scandinavian Association for Thoracic Surgery & The 26th Annual Meeting of the Scandinavian Society for Extracorporeal Technology, Reykjavik, Iceland.
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 from Biomedical Engineering Society Annual Meeting, Chicago, United States.
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 presented at 16th Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norway.
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 from 16th Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norway.
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 from 10th Annual Meeting. Advances in Innovative Technologies and Tissue Engineering for the Treatment of Heart Valve Disease, Hilton Head, United States.
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 presented at 10th Annual Meeting. Advances in Innovative Technologies and Tissue Engineering for the Treatment of Heart Valve Disease, Hilton Head, United States.
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 presented at PhD Day, University of Aarhus, Århus, Denmark.
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 presented at 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, United States.
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 presented at 16th Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norway.
Ng, H. S., Johansen, P., Nygaard, H. & Hasenkam, J. M. (2006). Visual Verification of Emboli Detection Using Doppler Ultrasound and Wavelet Transform. Poster session presented at 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 from 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 from 4th Biennial Meeting of The Society for Heart Valve Disease, New York, United States.
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 presented at Fourth Biennial Meeting of The Society for Heart Valve Disease, New York, United States.
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 presented at 17th Annual Meeting of the Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norway.
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 from 4th Biennial Meeting of The Society for Heart Valve Disease, New York, United States.
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 presented at 17th  Annual Meeting of The Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norway.
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. In 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 presented at BMES Annual Fall Meeting, Los Angeles, United States.
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 presented at 19th Annual Meeting of the Scandinavian Society for Research in Cardiothoracic Surgery, Geilo, Norway.

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Revised 13.11.2025
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Peter Johansen