Respiratory self-gated coronary MRI: A comparison between 2D spiral pencil beam and projection navigators

Mehdi Hedjazi Moghari,Peng Hu,Warren J Manning,Kraig V Kissinger,Lois Goepfert,Dana C Peters,Reza Nezafat,Beth Goddu

doi:10.1186/1532-429x-12-s1-p46

Abstract

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.

Highlights

Respiratory self-gated navigator techniques have been introduced to directly measure the respiratory induced heart motion from a single projection data
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
Images are acquired using a product diaphragmatic navigator placed on the dome of right hemi-diaphragm

Summary

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]. 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. Images are acquired using a product diaphragmatic navigator placed on the dome of right hemi-diaphragm. 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 measured

Materials and methods

Results

Conclusion