2108 Evaluation of whole-heart coronary mra with parallel imaging: comparison of acceleration in one-dimension vs. two-d
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BioMed Central
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Meeting abstract
2108 Evaluation of whole-heart coronary mra with parallel imaging: comparison of acceleration in one-dimension vs. two-dimensions Tomohisa Okada*1, Shotaro Kanao1, Shigehide Kuhara2, Ikuo Aoki2, Ayako Ninomiya2, Saori Sato2, Toshikazu Kamae1 and Kaori Togashi1 Address: 1Kyoto University, Kyoto, Japan and 2Toshiba Medical Systems, Otawara, Japan * 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):A377
doi:10.1186/1532-429X-10-S1-A377
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/A377 © 2008 Okada et al; licensee BioMed Central Ltd.
Introduction Multi-array coils that cover wide area of the body have become widely available. However, attainable advantage of them in the whole-heart coronary imaging has not been much investigated. It has been reported that rapid acquisition using parallel imaging (PI) with high acceleration in one direction largely deteriorates the image quality and acceleration in two direction yields superior image quality.
Purpose To evaluate degree of scan acceleration and image quality of 2D-PI coronary magnetic resonance angiography (CMRA) in comparison with 1D-PI CMRA using a multiarray coil system.
256 × 168 resulting in resolution of 1.3 mm and 1.5 – 1.9 mm, respectively dependent on the size of the subjects. The images were reconstructed to the voxel size of 0.6 × 0.6 × 0.75 mm3. The parallel imaging was applied with in phase direction by factor 2 for 1D-PI and in phase and slice directions by factor 2.5 and 2, respectively for 2D-PI. The acquisition window was segmented into 4 and 3 for 1D-PI and 2D-PI, respectively. The data of 3D CMRA was transferred to a commercially available workstation with image reconstruction software (AZE VirtualPlace Lexus, AZE Ltd., Tokyo, Japan). The CMRA quality was assessed blind to scan conditions in segment-wise with scores 0 – 4 by two radiologists (4: Excellent, 3: Fair, 2: Good, 1: visualized but inadequate for diagnosis, 0: not visualized).
Results Methods We studied 17 healthy subjects (13 males, 23 ± 3 years old) for coronary arteries, after obtaining written informed consent. MR imaging was performed on a 1.5 T scanner equipped with a whole body phased array coil system and 16-channel receivers. The elements were arranged four-by-four at both front and back. Only the two element rows were used to cover the whole heart. The CMRA was acquired in two conditions of 1D-PI and 2DPI. In both conditions, three-dimensional (3D), centricordered, segmented, refocused SSFP sequence (TR 4.3 ms, TE 2.2 ms, flip angle 120°) with respiration gating was used to cover the entire heart in 70 – 80 transverse slices (1.5 mm), a
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