ECG-gated 23Na-MRI of the human heart using a 3D-radial projection technique with ultra-short echo times View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2004-05-24

AUTHORS

R. Jerecic, M. Bock, S. Nielles-Vallespin, C. Wacker, W. Bauer, Lothar R. Schad

ABSTRACT

Pathological changes in tissue often manifest themselves in an altered sodium gradient between intra- and extracellular space due to a malfunctioning Na+–K+ pump, resulting in an increase in total sodium concentration in ischaemic regions. Therefore, 23Na-MRI has the potential to non-invasively differentiate viable from non-viable tissue by detecting concentration changes of intra- and extracellular sodium. As the in vivo sodium signal shows a bi-exponential T2 decay, with a short component of less than 1 ms, the accurate quantification of the total sodium content requires imaging techniques with ultra-short echo times (TE) below 0.5 ms. A 3D-radial projection technique has been developed which allows the acquisition of ECG-triggered sodium images of the human heart with a TE of 0.4 ms. With this pulse sequence 23Na-MRI volunteer measurements of the head or the heart were performed in less than 18 min on a 1.5-T clinical scanner with an isotropic resolution of 10 mm3. The signal to noise ratio of the radial projection technique is twofold higher than that of a Cartesian gradient echo pulse sequence (TE = 3.2 ms). Radial 23Na-MRI provides a tool for clinical studies, aiming at the differentiation of viable and non-viable tissue. More... »

PAGES

297-302

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10334-004-0038-8

DOI

http://dx.doi.org/10.1007/s10334-004-0038-8

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1006657500

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15160295


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