Magnetic resonance imaging assessment of cardiac function

Abstract

Measurements of left ventricular function at rest and during stress are useful for identifying myocardial ischemia, injury, and the risk of subsequent myocardial infarction. Without ionizing radiation or intravascular contrast administration, magnetic resonance imaging techniques can be used to acquire precise measurements of left ventricular function. This relatively new development may enhance a physician's ability to provide care to patients with cardiovascular disease.

The 20 year evolution of dobutamine stress cardiovascular magnetic resonance

“…With CMR, one can visualize the LV myocardium in multiple tomographic planes [17-19]. The image acquisition can be standardized, thus limiting reliance on the technique of an individual technologist for acquiring high-quality images [20,21].…”

Usefulness of a Comprehensive Cardiovascular Magnetic Resonance Imaging Assessment for Predicting Recovery of Left Ventricular Wall Motion in the Setting of Myocardial Stunning

“…The same projections used in cine images were recalled for analyzing perfusion (in first-pass perfusion imaging) and the transmural extent of necrosis (in late enhancement imaging). Wall motion (WM), abnormal if wall thickening at rest (endsystolic thickness Ϫ end-diastolic thickness) was Յ2 mm (6,7,15), was quantified in cine images.…”

“…Four viability indexes were evaluated: 1) end-diastolic thickness (abnormal if Յ5.5 mm) (6,15), and 2) WM during low-dose dobutamine (abnormal if Յ2 mm) (6,7) were quantified in cine images. 3) Abnormal perfusion was defined qualitatively as regions showing hypoenhancement (compared with non-infarcted segments at the same slice) at the end of the 90-to 120-s acquisition period in first-pass perfusion imaging (6,12,16,17).…”

Quantitative/Objective Analyses of RT-Induced Late Normal Tissue Injury Using Functional Imaging

“…Nuclear medicine imaging provides both qualitative and quantitative information about regional and global cardiac function , and has been suggested to be a sensitive means to assess myocardial injury in patients with coronary artery disease (Li and Deshpande 2001;Hundley et al 2003). MRI provides assessments of myocardial wall thickness and, with delayed hyperenhancement, allows direct visualization of myocardial (2001) injury/fibrosis, and is more sensitive in assessing subendocardial injury.…”