Publications for Per Ask
Co-author map based on ISI articles 2007-
Journal Articles
Linda Rattfält, Maria Lindén, Peter Hult, Per Ask and Magnus Borga
Robust Heart Beat Detector Based on Weighted Correlation and Multichannel Input: Implementation on the ECG recorded with textile electrodes
International Journal of E-Health and Medical Communications, 2013, 4(1), .
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Per Ask, Kristina Ekstrand, Peter Hult, Maria Lindén and Nils-Erik Pettersson
NovaMedTech - a regional program for supporting new medical technologies in personalized health care
Studies in Health Technology and Informatics, 2012, 177, 71-5.
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Per Ask, N-E Pettersson and K Andersson
Certification of Clinical Engineers in Sweden
WORLD CONGRESS ON MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING, VOL 25, PT 12, 2009, 25(12), 430-431.
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Peter Hult, Marcus Oscarsson, Linda Rattfält and Per Ask
A platform for patient monitoring in home health care including an interpretation tool for heart failure patients
WORLD CONGRESS ON MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING, VOL 25, PT 5, 2009, 25(5), 157-160.
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A. Hurtig-Wennlof, Christer Ahlström, R. Egerlid, M. Resare, Per Ask and P. Rask
Heart sounds are altered by open cardiac surgery
Experimental and Clinical Cardiology, 2009, 14(2), 18-20.
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Andrew Walker, Egil Henriksen, Ivar Ringqvist and Per Ask
A Rotating Cylinder Phantom for Flow and Tissue Color Doppler Testing
Ultrasound in Medicine and Biology, 2009, 35(11), 1892-1898.
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Ingrid Ljungvall, Christer Ahlström, Katja Hoglund, Peter Hult, Clarence Kvart, Michele Borgarelli, Per Ask and Jens Haggstrom
Use of signal analysis of heart sounds and murmurs to assess severity of mitral valve regurgitation attributable to myxomatous mitral valve disease in dogs
AMERICAN JOURNAL OF VETERINARY RESEARCH, 2009, 70(5), 604-613.
Web of Science® Times Cited: 6 |
Marcus Ressner, Tomas Jansson, Jonny Cedefamn, Per Ask and Birgitta Janerot Sjöberg
Contrast Biases the Autocorrelation Phase Shift Estimation in Doppler Tissue Imaging
Ultrasound in Medicine and Biology, 2009, 35(3), 447-457.
Web of Science® Times Cited: 3 |
Michelle Chew, Joakim Brandberg, Birgitta Janerot Sjöberg, Erik Sloth, J. Michael Hasenkam and Per Ask
Colour Doppler flow measurements using surface integration of velocity vectors (SIVV): Effect of colour flow gain, pulse repetition frequency and number of imaging planes
Open medical imaging journal, 2008, 2, 56-61.
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Christer Ahlström, Toste Länne, Per Ask and Anders Johansson
A method for accurate localization of the first heart sound and possible applications
Physiological Measurement, 2008, 29(3), 417-428.
Fulltext  Web of Science® Times Cited: 11 |
Ingrid Ljungvall, Christer Ahlström, Katja Höglund, Peter Hult, Clarence Kvart, Michele Borgarelli, Per Ask and Jens Häggström
Assessing mitral regurgitation attributable to myxomatous mitral valve disease in dogs using signal analysis of heart sounds and murmurs
, 2008, , .
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Christer Ahlström, Katja Höglund, Peter Hult, Jens Häggström, Clarence Kvart and Per Ask
Assessing Aortic Stenosis using Sample Entropy of the Phonocardiographic Signal in Dogs
IEEE Transactions on Biomedical Engineering, 2008, 55(8), 2107-2109.
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K. Hoglund, Christer Ahlström, J. Haggstrom, Per Ask, Peter Hult and C. Kvart
Time-frequency and complexity analyses for differentiation of physiologic murmurs from heart murmurs caused by aortic stenosis in boxers
American Journal of Veterinary Research, 2007, 68(9), 962-969.
Web of Science® Times Cited: 10 |
Linda Rattfält, Maria Lindén, Peter Hult, Lena Berglin and Per Ask
Electrical characteristics of conductive yarns and textile electrodes for medical applications
Medical and Biological Engineering and Computing, 2007, 45(12), 1251-1257.
Web of Science® Times Cited: 15 |
Christer Ahlström, Anders Johansson, Peter Hult and Per Ask
Chaotic dynamics of respiratory sounds
Chaos, Solitons & Fractals, 2006, 29(5), 1054-1062.
Web of Science® Times Cited: 5 |
Anders Johansson, Christer Ahlström, Toste Länne and Per Ask
Pulse wave transit time for monitoring respiration rate
Medical and Biological Engineering and Computing, 2006, 44(6), 471-478.
Web of Science® Times Cited: 13 |
Marcus Ressner, Lars-Åke Brodin, Tomas Jansson, Lars Hoff, Per Ask and Birgitta Janerot-Sjöberg
Effects of ultrasound contrast agents on doppler tissue velocity estimation
Journal of the American Society of Echocardiography, 2006, 19(2), 154-164.
Web of Science® Times Cited: 7 |
Christer Ahlström, Peter Hult, Peter Rask, Jan-Erik Karlsson, Eva Nylander, Ulf Dahlström and Per Ask
Feature Extraction for Systolic Heart Murmur Classification
Annals of Biomedical Engineering, 2006, 34(11), 1666-1677.
Web of Science® Times Cited: 28 |
Christer Ahlström, Anders Johansson, Fredrik Uhlin, Toste Länne and Per Ask
Noninvasive investigation of blood pressure changes using the pulse wave transit time: A novel approach in the monitoring of hemodialysis patients
Journal of Artificial Organs, 2005, 8(3), 192-197.
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Peter Hult, Tore Fjällbrant, Karin Hildén, Ulf Dahlström, Bengt Wranne and Per Ask
Detection of the third heart sound using a tailored wavelet approach: Method verification
Medical and Biological Engineering and Computing, 2005, 43(2), 212-217.
Web of Science® Times Cited: 9 |
Christer Ahlström, Olle Liljefeldt, Peter Hult and Per Ask
Heart sound cancellation from lung sound recordings using recurrence time statistics and nonlinear prediction
IEEE Signal Processing Letters, 2005, 12(12), 812-815.
Fulltext Web of Science® Times Cited: 9 |
Adriana Kvikliene, Rytis Jurkonis, Marcus Ressner, Lars Hoff, Tomas Jansson, Birgitta Janerot Sjöberg, Arunas Lukosevicius and Per Ask
Modelling of nonlinear effects and the response of ultrasound contrast micro bubbles: simulation and experiment
Ultrasonics, 2004, 42(01-Sep), 301-307.
Web of Science® Times Cited: 14 |
Peter Hult, Tore Fjällbrant, Bengt Wranne, O. Engdahl and Per Ask
An improved bioacoustic method for monitoring of respiration
Technology and Health Care, 2004, 12(4), 323-332.
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Peter Hult, Per Ask, Tore Fjällbrant and Bengt Wranne
Detection of the third heart sound using a tailored wavelet approach
Medical and Biological Engineering and Computing, 2004, 42(2), 253-258.
Web of Science® Times Cited: 11 |
Andrew Walker, Eva Olsson, Bengt Wranne, Ivar Ringqvist and Per Ask
Accuracy of spectral Doppler flow and tissue velocity measurements in ultrasound systems
Ultrasound in Medicine and Biology, 2004, 30(1), 127-132.
Web of Science® Times Cited: 21 |
O. Bech-Hanssen, P. Gjertsson, E. Houltz, Bengt Wranne, Per Ask, Dan Loyd and K. Caidahl
Net Pressure Gradients in Aortic Prosthetic Valves can be Estimated by Doppler
Journal of the American Society of Echocardiography, 2003, 16(8), 858-866.
Web of Science® Times Cited: 6 |
Per Ask, Sture Hägglund, J. Olsson, N-E Pettersson, Bengt Arne Sjöqvist and Hans Åhlfeldt
3G-satsning och 'pensionärsdatorer' kan lösa hälso- och sjukvårdens problem
Läkartidningen, 2003, 100, 1257-1258.
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Roger Andersson, Dan Loyd and Per Ask
Cross-sectional changes in an asymmetric tube with bearing on non-invasive pressure measurements
Technology and Health Care, 2003, 11(1), 11-20.
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Andrew Walker, Eva Olsson, Bengt Wranne, Ivar Ringqvist and Per Ask
Time delays in ultrasound systems can result in fallacious measurements.
Ultrasound in Medicine and Biology, 2002, 28, 259-263.
Web of Science® Times Cited: 14 |
Roger Andersson and Per Ask
Force to restore the shape of an asymmetric extracorporeal tube as the basis for non-invasive pressure measurements
International Journal of Artificial Organs, 2002, 25(4), 281-289.
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Roger Andersson and Per Ask
An asymmetric dialysis tube as an integrated part of a pressure-monitoring sensor
Technology and Health Care, 2001, 9(5), 417-425.
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Odd Bech-Hansen, Kenneth Caidahl, Ingemar Wallentin, Per Ask and Bengt Wranne
Assessment of effective orifice area of prosthetic aortic valves with Doppler echocardiography: An in vivo and in vitro study
Journal of Thoracic and Cardiovascular Surgery, 2001, 122(2), 287-295.
Web of Science® Times Cited: 15 |
Michelle Chew, Joakim Brandberg, Steinar Bjarum, Katrine Baek-Jensen, Erik Sloth, Per Ask, J. Michael Hasenkam and Birgitta Janerot Sjöberg
Pediatric cardiac output measurement using surface integration of velocity vectors: an in vivo validation study
Critical Care Medicine, 2000, 28(11), 3664-3671.
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O Bech-Hanssen, K Caidahl, I Wallentin, J Brandberg, Bengt Wranne and Per Ask
Aortic prosthetic valve design and size: Relation to Doppler echocardiographic findings and pressure recovery - An in vitro study
Journal of the American Society of Echocardiography, 2000, 13(1), 39-50.
Web of Science® Times Cited: 15 |
Michelle Chew, Joakim Brandberg, Peter Canard, Erik Sloth, Per Ask and Michael Hasenkam
Doppler flow measurement using surface integration of velocity vectors (Sivv): in vitro validation
Ultrasound in Medicine and Biology, 2000, 26(2), 255-262.
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M Imura, T Kuroda, O Oshiro, K Chihara, Joakim Brandberg and Per Ask
3-D flow visualization for construction of the model of the blood flow in the heart
Japanese Journal of Applied Physics, 2000, 39(5 B), 3246-3251.
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Peter Hult, Per Ask and Bengt Wranne
A bioacoustic method for timing of the different phases of the breathing cycle and monitoring of breathing frequency
Medical Engineering and Physics, 2000, 22(6), 425-433.
Web of Science® Times Cited: 18 |
Joakim Brandberg, Birgitta Janerot Sjöberg and Per Ask
Increased accuracy of echocardiographic measurement of flow using automated spherical integration of multiple plane velocity vectors
Ultrasound in Medicine and Biology, 1999, 25(2), 249-257.
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Christina Danbolt, Peter Hult, Lita Tibbling Grahn and Per Ask
Validation and characterization of the computerized laryngeal analyzer (CLA) technique
Dysphagia (New York. Print), 1999, 14(4), 191-195.
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Joakim Brandberg, Michelle Chew, Michael Hasenkam, Per Ask and Birgitta Janerot-Sjöberg
Cardiac output measurement using ultrasound in a paediatric model: In-vivo validation of the surface integration of velocity vectros (SIVV) technique
Clinical Physiology, 1999, 19(3), 198-198.
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Michelle Chew, Joakim Brandberg, Erik Sloth, Per Ask and Birgitta Janerot-Sjöberg
Non-invasive cardiac output measurement using colour Doppler ultrasound - the SIVV approach
Acta Anaesthesiologica Scandinavica, 1999, 114, 91-92.
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Bengt Wranne, Per Ask and Bertil Hök
Inte så lätt att använda stetoskopet på rätt sätt: Askulationens svåra konst bör ha stort utrymme i läkarutbildningen.
Läkartidningen, 1999, 96, 2981-2984.
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Ann Bolger, Lars Eidenvall, Per Ask, Dan Loyd and Bengt Wranne
Understanding continuous wave Doppler signal intensity as a measure of regurgitant severity
Journal of the American Society of Echocardiography, 1997, 10, 613-622.
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FA Flachskampf, J Köhler, Per Ask, W Lepper, G Haltern and P Hanrath
Overestimation of flow velocity through leaks in mechanical prosthese and other small orifices
Echocardiography, 1997, 10, 904-914.
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Urban Lönn, J Wulff, K-Y Keck, Bengt Wranne, Per Ask, Bengt Peterzén and Henrik Casimir Ahn
Flow characteristics of the hemopump: An experimental in Vitro study
Annals of Thoracic Surgery, 1997, 63(1), 162-166.
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Dan Loyd, Matts Karlsson, B-E Erlandsson and Per Ask
Computer analysis of hyperthermia treatment of the prostate
Advances in Engineering Software, 1997, 28, 347-351.
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Anders Thurin, G Goushegir, Per Ask and O Thulesius
Venous flow in an in vitro model: effect of extravascular pressure
Journal of Vascular Investigation, 1997, 3, 130-136.
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K Storck, Matts Karlsson, Per Ask and Dan Loyd
Heat transfer simulation in the evaluation of the nasal thermistor technique
IEEE Transactions on Biomedical Engineering, 1996, 43, 1187-1191.
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Lars Eidenvall, Per Ask, Dan Loyd and Bengt Wranne
Determination of regurgitant flow and volume by integrating actual proximal velocities over hemispheres (IPROV) in two orthogonal planes
Journal of the American Society of Echocardiography, 1996, 9(4), 527-538.
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Y Sun, Birgitta Janerot-Sjöberg, Per Ask, Dan Loyd and Bengt Wranne
Mathematical model that characterizes transmitral and pulmonary venous flow velocity patterns
American journal of physiology, 1995, 268, 476-489.
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Y Sun, Per Ask, Birgitta Janerot-Sjöberg, Lars Eidenvall, Dan Loyd and Bengt Wranne
Estimation of pulsatile flow by surface integration of velocity vectors in Doppler ultrasound images from two arthogonal planes
Journal of the American Society of Echocardiography, 1995, 8, 904-914.
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Lars Eidenvall, S A Barclay, Dan Loyd, Bengt Wranne and Per Ask
Regurgitant heart valve flow from 3D proximal velocity field - continued search for the ideal method
Medical & Biological Engineering & Computing, 1995, 33, 131-139.
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C Xiong, Bertil Hök, Tomas Strömberg, Dan Loyd, Bengt Wranne and Per Ask
A bioacoustic method for timing of respiration at cardiac investigations
Clinical Physiology, 1995, 15, 151-157.
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Per Ask, Bertil Hök, Dan Loyd and Heikki Teriö
Bioacoustic signals from stenotic tube flow
Medical & Biological Engineering & Computing, 1995, 33, 669-675.
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Anders Spångberg, Bengt Folkestad, B Kristjansson and Per Ask
New method to quantify the urodynamic improvement when treating bladder utlet obstruction - The efficacy of transurethral resectionin benign prostatic hypertrophy
Neurology, 1995, 14(4), 325-335.
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Birgitta Janerot-Sjöberg, Per Ask, Dan Loyd and Bengt Wranne
Subaortic flow profile in aortic valve disease - a two dimensional color Doppler study
Journal of the American Society of Echocardiography, 1994, 7, 276-284.
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Jan Engvall, Matts Karlsson, Per Ask, Dan Loyd, Eva Nylander and Bengt Wranne
Importance of collateral vessels in aortic coarctation: Computer simulation at rest and exercise using transmission line elements
Medical & Biological Engineering & Computing, 1994, 32, 115-122.
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Lars Eidenvall, Birgitta Janerot-Sjöberg, Per Ask, Dan Loyd and Bengt Wranne
2D Doppler Flowvelocity profiles can be time corrected with an external ECG delay device
Journal of the American Society of Echocardiography, 1992, 5, 405-413.
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Per Ask, P.Å. Öberg, S. Ödman, T. Tenland and M. Skogh
ECG Electrodes: A Study of Electrical and Mechanical Long-term Properties
Acta Anaesthesiologica Scandinavica, 1979, 23(2), 189-206.
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Per Ask and Lita Tibbling
Clinical evaluation of different fluid-filled systems for oesophageal manometry
Scandinavian Journal of Gastroenterology, 1979, 14(1), 1-5.
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Per Ask, H. Sökjer and Lita Tibbling
Mechanisms affecting lower oesophageal sphincter opening and oesophageal retention: A combined X-ray and manometry study
Scandinavian Journal of Gastroenterology, 1978, 13(7), 857-861.
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Per Ask and Lita Tibbling
A simple device measuring differences in level in the oesophagus
Acta Oto-Laryngologica, 1978, 85(3-4), 296-297.
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Per Ask, P. Åke Öberg and Lita Tibbling
Static and dynamic characteristics of fluid-filled esophageal manometry systems
American Journal of Physiology, 1977, 233(5), E389-E396.
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Lita Tibbling, Per Ask and H. Sökjer
Oesophagus fysiology mot bakgrund av nya medicintekniska landvinningar
Svensk Oe NH Tidskrift, 1977, 1(2), 1-1.
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Per Ask, Lita Tibbling and Åke Öberg
Metodutveckling för oesophagus-diagnostik
Svensk ÖNH-Tidskrift, 1977, 1(1), 1-1.
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Per Ask
EKG-elektroder: en svag länk vid övervakning
Medicinsk Teknik, 1974, (4), 12-15.
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Chapters in Books
Conference Articles
Linda Rattfält, Michel Chedid and Per Ask
Tillverkningsmetodens inverkan på elektriska egenskaper hos textila elektroder.
Posterpresentation på Medecinteknikdagarna, Conventum,2007, 2007.
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Christer Ahlström, Anders Johansson, Toste Länne and Per Ask
Monitorering av andning and blodtrycksförändringar baserat på EKG och hjärtljud
Medicinteknik dagarna,2007, 2007.
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Linda Rattfält, Michel Chedid, Peter Hult, Maria Lindén and Per Ask
Electrical Properties of Textile Electrodes
Engineering in Medicine and Biology Society, 2007. EMBS 2007, 2007.
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Christer Ahlström, Per Ask, Peter Rask, Jan-Erik Karlsson, Eva Nylander, Ulf Dahlström and Peter Hult
Assessment of Suspected Aortic Stenosis by Auto Mutual Information Analysis of Murmurs
Engineering in Medicine and Biology Society, 2007. EMBS 2007, 2007.
Web of Science® Times Cited: 2
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Marcus Ressner, L-Å. Brodin, Tomas Jansson, Per Ask and Birgitta Janerot-Sjöberg
How Ultrasound Contrast Agents effects Doppler Tissue Velocity Estimation
World Conference on Medical Physics and Biological Engineering, Seoul, 2006.
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Christer Ahlström, Peter Hult, P Rask, J-E Karlsson, Eva Nylander, Ulf Dahlström and Per Ask
Using the intelligent stethoscope for extraction of features for systolic heart murmur classification
World Congress on Medical Physics and Biomedical Engineering WC2006,2006, 2006.
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Christer Ahlström, K Höglund, Peter Hult, J Häggström, C Kvart and Per Ask
Distinguishing Innocent Murmurs from Murmurs caused by Aortic Stenosis by Recurrence Quantification Analysis
3rd International Conference on Biosignal Processing ICBP 2006,2006, 2006.
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Linda Rattfält, Christer Ahlström, Lena Berglin, Maria Lindén, Peter Hult, Per Ask and Urban Wiklund
A Canonical correlation approach to heart beat detection in textile ECG measurements
MEDSIP2006,2006, 2006.
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Christer Ahlström, Peter Hult and Per Ask
Thresholding distance plots using true recurrence points
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006, 2006.
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Christer Ahlström, Peter Hult and Per Ask
Detection of the 3rd Heart Sound using Recurrence Time Statistics
Proc. 31st IEEE Int. Conf. on Acoustics, Speech and Signal Processing, Toulouse, France, 2006, 2006.
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Marcus Ressner, Lars-Åke Brodin, Tomas Jansson, Lars Hoff, Per Ask and Birgitta Janerot-Sjöberg
Effekter av ultraljudskontrast vid hastighetsestimering med vävnadsdoppler
Svenska Läkaresällskapets Riksstämma 2005,2005, 2005.
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Linda Rattfält, Peter Hult, Maria Lindén, Caroline Hagström, Lena Berglin and Per Ask
Kroppsnära multisensorer och smarta textiplagg för vård och övervakning i hemmet.
Läkarsällskapets Riksstämma 2005,2005, 2005.
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Peter Hult, Christer Ahlström, Linda Rattfält, Cecilia Hagström, Nils-Erik Pettersson and Per Ask
The intelligent stethoscope
EMBEC05,2005, 2005.
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Marcus Ressner, Adriana Kvikliene, Lars Hoff, Rytis Jurkonis, Tomas Jansson, Birgitta Janerot-Sjöberg, Arunas Lukosevicius and Per Ask
Ultrasound contrast microbubbles: simulations and in vitro experiments
EMBEC05,2005, 2005.
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Christer Ahlström, Peter Hult and Per Ask
Wheeze analysis and detection with non-linear phase-space embedding
Nordic Baltic Conference Biomedical Engineering and Medical Physics,2005, 2005.
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Marcus Ressner, Adriana Kvikliene, Lars Hoff, Rytis Jurkonis, Tomas Jansson, Birgitta Janerot-Sjöberg, Arunas Lukosevicius and Per Ask
Ultrasound contrast for perfusion studies
Nordic Baltic Conference Biomedical Engineering and Medical Physics,2005, 2005.
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Peter Hult, Christer Ahlström, Linda Rattfält, Caroline Hagström, Nils-Erik Pettersson and Per Ask
The intelligent stethoscope as a tool in modern health care
Nordic Baltic Conference Biomedical Engineering and Medical Physics,2005, 2005.
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Marcus Ressner, Adriana Kvikliene, Lars Hoff, Rytis Jurkonis, Tomas Jansson, Birgitta Janerot-Sjöberg, Arunas Lukosevicius and Per Ask
Backscattered ultrasound from contrast microbubbles: effects of tissue and bubble interaction
EMBS,2004, 2004.
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Christer Ahlström, Anders Johansson, Toste Länne and Per Ask
A respiration monitor based on electrocardiographic and photoplethysmographic sensor fusion
IEEE Engineering in Medical and Biological Society,2004, 2004.
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Christer Ahlström, Peter Hult, Birgitta Schmekel and Per Ask
Automatisk detektering av ronki med icke-linjära metoder
Svenska Läkaresällskapets riksstämma,2004, 2004.
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Christer Ahlström, Peter Hult, Birgitta Schmekel and Per Ask
Wheeze detection with nonlinear statespace embedding
International Lung Sound Association,2004, 2004.
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Per Ask, Marcus Ressner, Birgitta Janerot-Sjöberg, Tomas Jansson, Rytis Jurkonis, Adriana Kvikliene and Lars Hoff
Simulation of ultrasound contrast bubble response and the non-linear ultrasound field - combining with in vitro experiments
New England Doppler Conference,2003, 2003.
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Odd Bech Hanssen, Bengt Wranne, Per Ask, Dan Loyd and Kenneth Caidahl
The net pressure gradients after pressure recovery can be predicted by Doppler in aortic bileaflet prostheses.
American Society of Echocardiography,2001, 2001.
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Roger Andersson, Dan Loyd and Per Ask
Pressure sensed non-invasively directly on the extra corporeal blood line tubes
Int Conference of the IEEE Engineering in Medicine and Biology Society,2001, 2001.
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Roger Andersson and Per Ask
Pressure sensed non-invasively directly on the extracorporeal dialysis tube
ESAO Congress,2001, 2001.
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M Imura, T Kuroda, O Oshiro, K Chihara, Joakim Brandberg and Per Ask
In-vitro blood flow visualization using 3-D reconstructionn of color doppler images
Image and Graphic Technology toward 21 Century and Beyound,2000, 2000.
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Odd Bech Hanssen, Bengt Wranne, Per Ask and Kenneth Caidahl
Doppler echocardiography ubderestimates prosthetic effective orifice area (EOA)
Am Society of Echocardiography,2000, 2000.
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Peter Hult, Tore Fjällbrant, S Dahle, P Danielsson and Per Ask
A method for respiration in monitoring by use of a bioacoustic signal
Medical signal and information processing MEDSIP,2000, 2000.
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Ursula Hass, Per Ask and Karin Wårdell
Competence Centre NIMED and it's graduate education - collaboration between university and industry.
Ann Int Conf of the IEEE Engineering in Medicine and Biology Society,1999, 1999.
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Matts Karlsson, Dan Loyd, Per Ask, K Lindström and Håkan Elmqvist
CORTECH tutor - a distributed biomedical engineering graduate training initiative
The 1st Joint Meeting of BMES and EMBS,1999, 1999.
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Michelle Chew, Joakim Brandberg, Birgitta Janerot-Sjöberg, Erik Sloth, Per Ask and Michael Hasenkam
Noninvasive cardiac output measurement using Doppler echocardiography; current status and future perspective using Surface Integration of Velocity Vectors (SIVV)
Danish Society of Anesthesiologists,1999, 1999.
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Joakim Brandberg, Matts Karlsson, Dan Loyd, Bengt Wranne and Per Ask
Integration of proximal velocities (IPROV) - An improvment of the pisa method for estimation of regurgitant flow.
European Soc for Noninvasive Cardiovascular Dynamics,1998, 1998.
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MS Chew, Joakim Brandberg, p Cannard, E Sloth, JM Hasenkam and Per Ask
Evaluation of the surface integration of velocity vectors (SIVV) method in tubular flow model
European Soc for Noninvasive cardiovascular dynamics,1998, 1998.
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Per Ask, Joakim Brandberg, Birgitta Janerot-Sjöberg, Matts Karlsson, Dan Loyd and Bengt Wranne
Assessment of heart valve function with echocardiography
World Congress on Medical Physics and Biomedical Engineering,1997, 1997.
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Per Ask, F Flaschemkampf and M Hasenkam
Non-invasive approach to hemodynamic assessment of heart valves (INVADYNE)
World congress on Medical Physics and Biomedical Engineering,1997, 1997.
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Per Ask
How to assess heart valve function with echocardiography
European Conference on Engineering and Medicine,1997, 1997.
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Joakim Brandberg, Birgitta Janerot-Sjöberg, Peter Wodlin, Dan Loyd, Per Ask and Y Sun
In vivo estimation of cardiovascular flows with surface integration of velocity vectors from color Doppler imaging
Annual International Conference of the IEEE Engineering in Medicine and Biology Society,1996, 1996.
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Joakim Brandberg, Birgitta Janerot-Sjöberg, Peter Wodlin, Per Ask and Y Sun
The SIVV technique for quantifying cardiovascular flows in vivo
Congress of the European Society of Cardiology,1996, 1996.
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Joakim Brandberg, Matts Karlsson, Lars Eidenvall, Birgitta Janerot-Sjöberg, Dan Loyd, Bengt Wranne and Per Ask
Automated calculation of regrgitation from proximal 2D Doppler data
Congress of the European Society of Cardiology,1996, 1996.
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Lars Eidenvall, Per Ask, Dan Loyd and Bengt Wranne
Determination of regurgitant flow in a pulsatile model by integrating velocities from the entire 3D proximal velocity field
American Heart Association,1993, 1992.
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Per Ask, Lita Tibbling and P.Å. Öberg
Bandbreddskrav hos oesophagusmanometriska system.
Läkarsällskapets Riksstämma, 1978.
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Per Ask, Lita Tibbling and Åke Öberg
Metodutveckling för oesophagus-diagnostik
Läkarsällskapets Riksstämma, 1976.
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Per Ask, Lita Tibbling and Åke Öberg
Compliance and bandwidth of oesophagus manometry systems
11th International Conference on Medical and Biological Engineering, Ottawa, Canada, 1976.
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Per Ask, Marcus Skogh and Åke Öberg
Elektriska och mekaniska egenskaper hos EKG-elektroder
Läkarsällskapets Riksstämma, 1974.
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Ph.D. Theses
Licentiate Theses
Reports
Per Ask, Marcus Skogh, Åke Öberg and Torsten Tenland
Undersökning av EKG-elektroders elektriska och mekaniska långtidsegenskaper. Kompletterande studie 1
Institutionen för medicinsk teknik, Universitetet i Linköping, 0009, 1975.
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Per Ask, Marcus Skogh and Åke Öberg
Undersökning av EKG-elektroners elektriska och mekaniska långtidsegenskaper
1974.
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Per Ask, Marcus Skogh and Åke Öberg
Undersökning av EKG-elektroders elektriska och mekaniska långtidsegenskaper
Linköpings högskola, Institutionen för medicinsk teknik, 0005, 1974.
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Ph.D., Lic. Theses
