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Petra S Niemann

Oregon Health & Science University

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Publication

Featured researches published by Petra S Niemann.

Journal of Cardiovascular Magnetic Resonance | 2010

Diastolic untwisting is altered in patients with congenital heart disease: a novel MR speckle tracking method for cine-MRI

Petra S Niemann; Helene Houle; Craig S. Broberg; Michael Silberbach; Zhiwen Zhou; Muhammad Ashraf; David J. Sahn

Methods We studied 15 pts with TOF (6 mon-45 y) post repair, 15 pts with ASD, VSD and CO (5 y-37 y) and 8 healthy adults (24-35 y). MR images were acquired with an ECG gated 1.5/3 T Magnet with segmented gradient-echo cine-loop sequences (short/long/rotated axis) to cover the entire RV and LV. Images were analyzed offline by VVI (Siemens). RV size and function was correlated for each patient). LV myocardial strain, direction of twist and untwisting, time to peak twist and length to peak diastolic untwisting were measured and compared for each patient.

Journal of the American College of Cardiology | 2007

Anatomically oriented right ventricular volume measurements with dynamic three-dimensional echocardiography validated by 3-Tesla magnetic resonance imaging.

Petra S Niemann; Luiz Pinho; Thomas Balbach; Christian Galuschky; Michael Blankenhagen; Michael Silberbach; Craig S. Broberg; Michael Jerosch-Herold; David J. Sahn

Journal of The American Society of Echocardiography | 2007

The Contribution of Left Ventricular Muscle Bands to Left Ventricular Rotation: Assessment by a 2-Dimensional Speckle Tracking Method

Ling Hui; James Pemberton; Edward Hickey; Xiao Kui Li; Peter Lysyansky; Muhammad Ashraf; Petra S Niemann; David J. Sahn

Circulation | 2009

Characterization of Ventricular Myocardial Performance in the Fetus by Tissue Doppler Imaging

Sayaka Watanabe; Ikuo Hashimoto; Kazuyoshi Saito; Kazuhiro Watanabe; Keiichi Hirono; Keiichiro Uese; Fukiko Ichida; Shigeru Saito; Toshio Miyawaki; Petra S Niemann; David J. Sahn

Journal of the American College of Cardiology | 2011

DEFINING LEFT VENTRICULAR STRAIN WITH SEGMENTAL ATRIAL, RIGHT VENTRICULAR AND LEFT VENTRICULAR PACING CONDITIONS: AN ULTRASOUND VECTOR VELOCITY STUDY

David J. Sahn; Petra S Niemann; Helene Houle; John I. Jackson; Edward J. Hickey; Muhammad Ashraf

Journal of the American College of Cardiology | 2011

VENTRICULAR TWIST AND STRAIN ALTERATIONS IN PATIENTS WITH COARCTATION OF THE AORTA: A NOVEL GRADIENT CINE MRI WITH STRAINS COMPUTED BY VECTOR VELOCITY IMAGING

David J. Sahn; Petra S Niemann; Helene Houle; Craig S. Broberg; Michael Silberbach; Muhammad Ashraf

Archive | 2010

Resonance Imaging Magnetic Dynamic Three-Dimensional Echocardiography Validated by 3-Tesla Anatomically Oriented Right Ventricular Volume Measurements With

David J. Sahn; Michael Silberbach; Craig S. Broberg; Michael Jerosch-Herold; Petra S Niemann; Luiz Pinho; Thomas Balbach; Christian Galuschky

Archive | 2010

CONGENITAL CARDIOLOGY SOLUTIONS (PEDIATRIC CARDIOLOGY AND ADULT CONGENITAL HEART DISEASE) INSIGHTS INTO VENTRICULAR MECHANICS IN THE UNLOOPED HEART: VENTRICULAR TWISTING AND UNTWISTING IN A RIGHT ATRIAL ISOMERISM SINGLE VENTRICLE FETAL MOUSE MODEL

David J. Sahn; Lowell H. Frank; Linda Leatherbury; Uyen Truong; Cecelia W. Lo; Qing Yu; Petra S Niemann

Journal of the American College of Cardiology | 2010

A NON-INVASIVE MR SPECKLE TRACKING STUDY OF MYOCARDIAL STRAIN AND ROTATIONAL VELOCITY IN PATIENTS WITH CONGENITAL HEART DISEASE

David J. Sahn; Petra S Niemann; Helene Houle; Craig S. Broberg; Michael Silberbach; Zhiwen Zhou; Muhammad Ashraf

Journal of the American College of Cardiology | 2010

INSIGHTS INTO VENTRICULAR MECHANICS IN THE UNLOOPED HEART: VENTRICULAR TWISTING AND UNTWISTING IN A RIGHT ATRIAL ISOMERISM SINGLE VENTRICLE FETAL MOUSE MODEL

David J. Sahn; Lowell H. Frank; Linda Leatherbury; Uyen Truong; Cecelia W. Lo; Qing Yu; Petra S Niemann

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David J. Sahn

Oregon Health

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Craig S. Broberg

Oregon Health

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Michael Silberbach

Oregon Health

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Helene Houle

Siemens

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Luiz Pinho

Oregon Health

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Michael Jerosch-Herold

Brigham and Women's Hospital

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Muhammad Ashraf

University of Cincinnati

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Muhammad Ashraf

University of Cincinnati

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Ling Hui

Oregon Health

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Zhiwen Zhou

Oregon Health

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