Abstract
Background Measures of left ventricular cardiac mechanics such as strains and torsion are becoming increasingly important for assessing heart function. Cardiac magnetic resonance (CMR) can be used to quantify cardiac mechanics using several methods such as tagged CMR or cine Displacement Encoding with Stimulated Echoes (DENSE). These images are generally acquired during an end-expiratory breath-hold. Unfortunately, it is difficult for subjects to hold their breath at the exact same position when undergoing a series of breath-holds during a typical CMR study. For example, end-expiratory breath-hold positions have an average range of about 8 millimeters (mm). The effects of different breath-hold positions on measures of cardiac mechanics have not been investigated. We hypothesized that the normal variability in breath-hold positions would significantly affect the quantification of left ventricular strains and torsion.
Highlights
Measures of left ventricular cardiac mechanics such as strains and torsion are becoming increasingly important for assessing heart function
A 3T Siemens Tim Trio scanner was equipped with a navigator feedback system to enable subjects to view their diaphragm position in real time during image acquisition
Diaphragm position had a minimal effect on left ventricular radial strain, circumferential strain, and torsion (Figure 1)
Summary
Sean M Hamlet3,1*, Gregory J Wehner, Jonathan D Suever, David Powell, Christopher M Haggerty, Linyuan Jing, Xiaodong Zhong, Frederick H Epstein, Brandon K Fornwalt. From 17th Annual SCMR Scientific Sessions New Orleans, LA, USA. From 17th Annual SCMR Scientific Sessions New Orleans, LA, USA. 16-19 January 2014
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
