Volume 13 Supplement 1
Independent respiratory navigators for improved 3D PSIR imaging of myocardial infarctions
© Lee et al; licensee BioMed Central Ltd. 2011
Published: 2 February 2011
Imaging was performed on a 3T system (Philips Healthcare, Best, The Netherlands) using a 32-channel cardiac array coil (InVivo, Gainsville FL). Phantoms: agar gel phantoms with varying T1 values were placed on a pneumatic motor that oscillated 20 mm in the antero-posterior direction every second. Animals: Under ACUC-approved protocol, six swine underwent 2 hr LAD occlusion. Imaging took place 4-25 weeks post-infarction and 10-3 min post double-dose injection of Magnevist (Schering, Germany). A 3D GRE sequence with 1.25x1.25x4 mm3 resolution and 2.5 min scan time ( assuming 100% gating efficiency) was used.
Figure 1 (c-j) compares PSIR and INPSIR. (c-d) images from moving agar gels demonstrate possible artifacts when no motion compensation is used for the reference images. Short-axis images from an infarcted swine model including reference image magnitude, single-coil phase and phase-sensitive reconstruction are shown. The phase reference image was improved with INPSIR (arrows) and navigator efficiency was not affected.
This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.