Respiratory self-gated coronary MRI: A comparison between 2D spiral pencil beam and projection navigators
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BioMed Central
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Respiratory self-gated coronary MRI: A comparison between 2D spiral pencil beam and projection navigators Mehdi Hedjazi Moghari*, Peng Hu, Dana C Peters, Beth Goddu, Lois Goepfert, Kraig V Kissinger, Warren J Manning and Reza Nezafat Address: Harvard Medical School and Beth Israel Deaconess Medical Center, Boston, MA, USA * Corresponding author
from 13th Annual SCMR Scientific Sessions Phoenix, AZ, USA. 21-24 January 2010 Published: 21 January 2010 Journal of Cardiovascular Magnetic Resonance 2010, 12(Suppl 1):P46
doi:10.1186/1532-429X-12-S1-P46
Abstracts of the 13th Annual SCMR Scientific Sessions - 2010
Meeting abstracts - A single PDF containing all abstracts in this Supplement is available here. http://www.biomedcentral.com/content/files/pdf/1532-429X-11-S1-infoThis abstract is available from: http://jcmr-online.com/content/12/S1/P46 © 2010 Moghari et al; licensee BioMed Central Ltd.
Purpose To investigate performance of a prospective respiratory self-gating with a single projection method compared to the 2D spiral pencil beam, so called diaphragmatic navigator, positioned on the right diaphragm, for coronary MRI.
Background Respiratory self-gated navigator techniques have been introduced to directly measure the respiratory induced heart motion from a single projection data. The estimated motion is used to retrospectively eliminate the respiratory motion artifact of the acquired images[1,2]. In this study, we have implemented and evaluated a prospectively gate self-gating coronary MRI, and compared the acquired images with the ones reconstructed by the diaphragmatic navigator.
spective gating method is integrated into image reconstruction of our scanner. For comparison, images are also acquired using a product diaphragmatic navigator placed on the dome of right hemi-diaphragm. Human studies are conducted on five healthy subjects with written consent. A free-breathing ECG-triggered-SSFP(TE/TR/α = 2.1 ms/ 4.3 ms/90 deg, spatial-resolution = 1 × 1 × 3 mm3) sequence is used for imaging right coronary artery-RCA. The acquired images are graded by two readers. Signal to noise ratio(SNR), and contrast to noise ratio(CNR) are also measured.
Materials and methods A respiratory self-gating coronary MRI sequence is implemented on Philips 1.5 T to measure center line of k-space of the imaging volume, immediately prior to the data acquisition. The Fourier transform of the measured signal provides a projection-profile. By computing cross-correlation between the most recently acquired profile and the reference one, the first acquired profile, the respiratory induced heart motion is estimated. Computed heart displacement is, then, utilized for prospectively gating the respiratory motion of the heart. Acceptance window range of 5 mm is employed to accept/reject the data. The pro-
Figureacquired Example artery 1slices from usinga diaphragmatic 3D data-set showing navigator right coronary Example slices from a 3D data-set showing right coronary artery acquired u
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