2057 Quantitative estimation of right ventricular function obtained from images acquired in oblique sagittal orientation
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BioMed Central
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Meeting abstract
2057 Quantitative estimation of right ventricular function obtained from images acquired in oblique sagittal orientation is accurate and easier compared to that obtained by the left ventricular short axis and oblique transverse orientations Benjamin Cheong*, Preethi Nambi, Mercedes Pereyra and Raja Muthupillai Address: St. Luke's Episcopal Hospital, Department of Radiology, Houston, TX, USA * Corresponding author
from 11th Annual SCMR Scientific Sessions Los Angeles, CA, USA. 1–3 February 2008 Published: 22 October 2008 Journal of Cardiovascular Magnetic Resonance 2008, 10(Suppl 1):A326
doi:10.1186/1532-429X-10-S1-A326
Abstracts of the 11th Annual SCMR Scientific Sessions - 2008
Meeting abstracts – A single PDF containing all abstracts in this Supplement is available here. http://www.biomedcentral.com/content/pdf/1532-429X-10-S1-info.pdfThis abstract is available from: http://jcmr-online.com/content/10/S1/A326 © 2008 Cheong et al; licensee BioMed Central Ltd.
Introduction In clinical practice, RV volumes are estimated from the same short-axis imaging orientations (LVSAX) used to estimate LV volumes. However, estimating RV volumes using images acquired in the LVSAX orientation is often challenging. The crescentic shape of the RV near the base of the heart makes it difficult to delineate RV chamber due to the through plane motion of the tricuspid valve (TV) and the pulmonic valve (PV) during the cardiac cycle. The purpose of this study is to test if an alternate imaging orientation would provide better visualization of the RV valves, and provide a robust quantitation of RV volumes.
Purpose The purpose of this study is to compare the RV functional metrics obtained from cine steady-state free precession (SSFP) images acquired in three different imaging orientations.
axis orientation; (2) RVSAG: A set of contiguous slices acquired parallel to the long axis of the RV defined by the line intersecting the center of TV annulus and the RV apex. This orientation enables visualizing both the TV, and the PV in the plane of imaging; (3) RVAX: A set of contiguous slices that are oriented perpendicular to the line connecting the center of the PV annulus to the juncture of the RV free wall and the inferior wall. In addition, flow through the aorta was measured using a phase contrast MR imaging method. A single blinded observer measured the RV volumes from SSFP images along all three imaging orientations using a commercially available workstation (ViewForum, Philips Medical Systems). An independent observer also ranked the increasing ease with which the PV and TV were visualized in images on a score of 1 through 3.
Results Methods Twenty healthy volunteers (12 males; age: 37 ± 9 years) with no past cardiac history were imaged on a 1.5 T commercial scanner. A set of contiguous slices covering the ventricular chambers of the heart were obtained using a SSFP sequence with the following parameters: TR/TE/flip: 3.2/1.6/65°; acquired resolution: 2.25 × 2.5 × 8 mm, temporal r
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