Paper

Last ubdate 31.01.03 Hans Torp

2002

R. Haaverstad & al.:” Intraoperative Color-Doppler Assessment of LIMA-LAD anastomoses in Off-pump Coronary Artery Bypass Surgery”,  Ann Thorac Surg 2002;74:S1390–4  pdf

STEIN INGE RABBEN,* STEINAR BJÆRUM,† VIDAR SØRHUS‡ and HANS TORP “ULTRASOUND-BASED VESSEL WALL TRACKING: AN AUTO-CORRELATION TECHNIQUE WITH RF CENTER FREQUENCY ESTIMATION”, Ultrasound in medicine and biology, Vol. 28, No. 4, 2002   pdf

Steinar Bjærum, Hans Torp, and Kjell Kristoffersen:" Clutter Filter Design for Ultrasound Color Flow Imaging" IEEE transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2002 pdf

Haugen BO, Berg S, Samstad SO et al  “Blood flow velocity profiles in the aortic annulus: A 3-dimensional freehand color flow Doppler imaging study”. Journal of the American Society of Echocardiography. Vol. 15, 2002  

2001

Johan Kirkhorn, Peter J.A. Frinking, Nico de Jong and Hans Torp :" Three-stage approach to ultrasound contrast imaging " IEEE transactions on Ultrasonics, Ferroelectrics and Frequency Control. Vol 48, 2001  pdf

Bjørn Olav Haugen, Steinar Bjærum, Stein Olav Samstad, Terje Skjærpe, and Hans Torp :" A New Method Describing Cross-Sectional Blood Flow Velocity Profiles in the Left Ventricular Outflow Tract of Patients with Atrial Fibrillation with the Use of High Frame-Rate 2-Dimensional Color Flow Imaging"
Journal of the American Society of Echocardiography. 2001

Stig A. Slørdahl, Steinar Bjærum, Brage H. Amundsen, Asbjørn Støylen, Andreas Heimdal, Stein Inge Rabben, and Hans Torp: " High Frame Rate Strain Rate Imaging of the Ventricular Septum in Healthy Subjects"
European Journal of Ultrasound Vol 14, 2001 pdf

P.J.A Frinking, E.I.Céspedes, J.Kirkhorn, H. Torp and N. de Jong: "A new ultrasound contrast imaging approach based on the combination of multiple imaging pulses and a separate release burst". IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control Vol. 48 No. 3, 2001. pdf

2000

Haugen BO, Berg S, Brecke KM, Samstad SO, Skjærpe T, Slørdahl SA, Torp H.  "Velocity profiles in mitral blood flow based on three-dimensional freehand colour flow imaging acquired at high frame rate " European Journal of Ultrasound, pp. 252-256, 2000

S. Bjærum and H. Torp, "Statistical evaluation of clutter filters in color flow imaging," Ultrasonics, vol. 38, pp. 376-380, Mar. 2000. pdf

Haugen BO, Berg S, Samstad SO et al. Measurement of volumetric mitral and aortic blood flow based on a new freehand three-dimensional colour flow imaging method. An in vivo validation. Eur J Echocardiography 2000;1:204-211.  

A. Stoylen, A. Heimdal, K. Bjornstad, R. Wiseth, H. Vik-Mo, H. Torp, B. Angelsen, T. Skjaerpe, "Strain Rate Imaging by Ultrasound in the Diagnosis of Coronary Artery Disease", Journal of the American Society of Echocardiography, Vol. 13, No. 12, pp. 1053-64, 2000.

Berg S, Torp H, Haugen BO, Samstad S."Volumetric blood flow measurement with the use of dynamic 3-dimensional ultrasound color flow imaging." J Am Soc Echocardiogr. 2000 May;13(5):393-402.

Berg S, Torp H, Blaas, H: " Accuracy of in-vitro volume estimation of small structures using three-dimensional ultrasound"  Ultrasound Med Biol 2000 Volum: 26 Sider: 425 - 432  pdf

S. Urheim & al. : “Myocardial Strain by Doppler Echocardiography”, Circulation, september 2000  

1999

Berg S, Torp H, Martens, D , Steen, Erik , Samstad, Stein Høivik, Inge Olstad, Bjørn : "Dynamic three-dimensional freehand echocardiography using raw digital ultrasound data" Ultrasound Med Biol. 1999 Jun;25(5) År: 1999 Sider: 745 - 753 

A. Stoylen, A. Heimdal, K. Bjornstad, H. G. Torp, T. Skjaerpe, "Strain Rate Imaging by Ultrasound in the Diagnosis of Regional Dysfunction of the Left Ventricle", Echocardiography, Vol. 16, No. 4, 1999

X. Lai and H. Torp, “Interpolation Methods for Time delay Estimation in the RF-Signal Crosscorrelation Technique for Blood Velocity Measurement,” IEEE Trans. on Ultrasound, Ferroelectrics, and Frequency control, no. , 1999. pdf

1998

H. Blaas, S. Eik-Nes, S. Berg, and H. Torp, “In-vivo three-dimensional ultrasound reconstructions of embryos and early fetuses,”  The Lancet, Volume 352, Issue 9135, 10 October 1998, Pages 1182-1186   pdf

A. Heimdal, A. Støylen, H. Torp, and T. Skjærpe, “Real-Time Strain Rate Imaging of the Left Ventricle by Ultrasound”, Journal of the American Society of Echocardiography, vol. 11, pp. 1013-9, 1998.

1997

X. Lai, H. Torp, and K. Kristoffersen, “An extended autocorrelation method for estimation of blood velocity ,” IEEE Trans. on Ultrasound, Ferroelectrics, and Frequency control, no.6 , 1997. pdf

K. Bjørnstad, S. Aakhus, and H. Torp, “How does computer-assisted digital wall motion analysis influence observer agreement and diagnostic accuracy during stress echocardiography,” Int. Journal of Cardiac Imaging, vol. 13, no. , pp. 105 - 114, 1997.

A. Heimdal and H. Torp, “Ultrasound Doppler Measurements of Low Velocity Blood Flow: Limitations Due to Clutter Signal from Vibrating Muscles,” IEEE Trans. on Ultrasonics, Ferroelectrics and Frequency Control, vol. 44, no. 4, pp. 873-881, 1997. ISSN 0885-3010 pdf

K. Bjørnstad, J. Mæhle, S. Aakhus, H. Torp, L. Hatle, and B. Angelsen, “Evaluation of reference systems for quantitative wall motion analysis from three-dimensional endocardial surface reconstruction: An echocardiographic study in subjects with and without myocardial infarction,” American Journal of Cardiac Imaging, vol. 10, no. 4, pp. 244 - 253, 1996.

 H. Torp, “Clutter rejection filters in Color Flow Imaging: A theoretical Approach,” IEEE Trans. on Ultrasound, Ferroelectrics, and Frequency control, vol. 44, no. 2, pp. 417 - 424, 1997. pdf

1996

A. Gronningsaeter, B. A. J. Angelsen, A. Heimdal, and H. Torp, “Wessel Wall Detection and Blood Noise Reduction in Intravascular Ultrasound Imaging,” IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency control, vol. 43, no. 3, pp. 359 - 369, 1996. pdf

1995

H. Torp and K. Kristoffersen, “Velocity Matched Spectrum Analysis:  A new Method for suppressing Velocity Ambiguity in Doppler Sonogram,” Ultrasound in Medicine and Biology, vol. 21, no. 7, pp. 937 - 944, 1995. pdf

 A. Gronningsaeter, B. A. J. Angelsen, A. Gresli, H. G. Torp, and D. T. Linker, “Blood noise reduction in intravascular ultrasound imaging,” IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency control, vol. 42, No.2, no. , pp. 200-209, 1995. pdf

B. Angelsen, H. Torp, S. Holm, K. Kristoffersen, and T. A. Whittingham, “Which Transducer Array is best?,” European Journal of Ultrasound, no. 2, pp. 151 - 164, 1995.  pdf

H. Torp, K. Kristoffersen, and B. Angelsen, “On the Joint Probability Density Function for the Autocorrelation estimates in Color Flow Imaging,” IEEE Trans. on Ultrasound, Ferroelectrics, and Frequency control, vol. 42, no. 5, pp. 899 - 906, 1995. pdf

1994

M. Stugaard, U. Brodahl, H. Torp, and H. Ihlen, “Abnormalities of left ventricular filling in patients with coronary artery disease: assessment by colour M-mode Doppler technique,” European Heart Journal, vol. 15, no. , pp. 318 - 327, 1994.

B. A. J. Angelsen, S. Aakhus, S. I. Rabben, and H. Torp, “Model based estimation of vascular parameters - Evaluation of robustness and suitability of models,” Echocardiography, vol. Vol. 11, no. No. 4, pp. 409-423, 1994.

J. Mæhle, K. Bjoernstad, S. Aakhus, H. G. Torp, and B. A. J. Angelsen, “Three-dimensional echocardiography for quantitative left ventricular wall motion analysis. A method for reconstruction of endocardial surface and evaluation of regional dysfunction.,” Echocardiography, Vol. 11, No. 7, vol. 11, no. 4, pp. 397-408, 1994.

H. Torp, K. Kristoffersen, and B. Angelsen, “Autocorrelation Techniques in Color Flow Imaging.  Signal model and statistical properties of the Autocorrelation estimates,” IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency control, vol. 41, no. 5, pp. 604 - 612, 1994. pdf

1993

S. Samstad, O. Rossvold, H. Torp, T. Skjærpe, and L. Hatle, “Interobserver and Intraobserver Variation of Cross Sectional Early Mitral flow Velocity Profiles from color Doppler,” Journal of Cardiovascular Diagnosis and Procedures, vol. 11, no. 3, pp. 167 - 178, 1993.

S. Aakhus, H. Torp, T. Haugland, and L. Hatle, “Noninvasive estimate of aortic root pressures: External subclavian arterial pulse tracing calibrated by oscillometrically determined bracial arterial pressures,” Clinical Physiology, vol. 13, no. , pp. 573 - 586, 1993.

R. Wiseth, S. Samstad, O. Rossvold, H. Torp, T. Skjærpe, and L. Hatle, “Cross sectional left ventricular outflow tract velocity profiles before and after aortic valve replacement.  A comparative study with two-dimensional Doppler ultrasound,” Journal of the American Society  of Echocardiography, vol. 6, no. 3, pp. 279 - 285, 1993.

1992

S. Samstad, O. Rossvold, H. Torp, T. Skjærpe, and L. Hatle, “Impact of changes in heartrate and stroke volume on the cross sectional flow velocity distribution of mitral  flow:  A study on 6 patients with pace makers programmed at different heart rates,” Journal of cardiac imaging, vol. Vol. 8, no. , pp. 75 - 83, 1992.

S. Samstad, H. Torp, O. Rossvold, and L. Hatle, “Cross sectional  early mitral Flow-Velocity profiles from Color Doppler in patients with mitral valve Disease,” Circulation, vol. Vol. 86, no. , pp. 748 - 755, 1992  

1991

A. O. Brubakk, H. Torp, and B. A. J. Angelsen, “Noninvasive evaluation of flow changes and gas bubbles in the circulation by combined use of color-flow-imaging and computer post processing,” Acta Astronautia, vol. Vol. 23, no. , pp. 311 - 319, 1991.

R. Juul, S. Slørdahl, H. Torp, B. A. J. Angelsen, and A. O. Brubakk, “Flow estimation using ultrasound imaging (color M-mode) and computer post processing,” Journal of Cerebral Blood Flow and Metabolism, vol. 11, no. , pp. 879 - 882, 1991

O. Rossvold, S. Samstad, H. Torp, D. Linker, T. Skjærpe, B. Angelsen, and L. Hatle, “The velocity distribution in the aortic annulus in man: A quantitative approach to two-dimensional Doppler flow maping,” Journal of  the American Society  of Echocardiography, vol. 4, no. , pp. 367 - 378, 1991

1980-1990

B. A. J. Angelsen, S. Slørdahl, J. E. Solbakken, S. Samstad, D. Linker, H. Torp, and H. Piene, “Estimation of Regurgitant Volume and Orifice in Aortic Regurgitation combining CW Doppler and Parameter Estimation in a Windkessel-like Model,” IEEE Transactions on Biomedical Engineering, vol. Vol. 37, no. No 10, pp. 930 - 936, 1990

S. Samstad, H. Torp, D. Linker, O. Rossvold, T. Skjærpe, E. Johansen, K. Kristoffersen, B. A. J. Angelsen, and L. Hatle, “Cross sectional early mitral flow velocity profiles from colour Doppler,” British Heart Journal, vol. vol. 62, no. , pp. 177 - 184, 1989.

D. Linker, E. Johansen, H. Torp, and B. Angelsen, “Practical Considerations, Design, and Applications of a Digital System for Acquisition of Ultrasonic Tissue and Flow Data,” Echocardiography, vol. Vol. 5, no. No 6, pp. 1 - 10, 1988.

B. Backe, C. J. Brodtkorp, J. Giltvedt, S. Kvernes, A. O. Brubakk, H. Torp, and B. A. J. Angelsen, “Fetal and Maternal Blood Flow in two different maternal positions,” Ultrasound in Med. & Biol., vol. Vol. 9, no. , pp. 587-593, 1983.