Tracking local volume 3D-echo-planar coronary artery imaging.
Aiming for robust high-resolution free respiration coronary artery imaging, localized tracking volume selective 3D-EPI at spatial resolution 1.25 x 1.25 x 3 mm and temporal resolution 65 ms was evaluated in 14 normal subjects. Subject-specific motion tracking factors were measured between diaphragm navigator and coronary artery in S-I and A-P directions. Imaging was repeated with and without tracking, accepting 128 cardiac cycles over a 20-mm range from free breathing. Reference images with minimal respiratory motion (5-mm range) used LED-guided multiple breathholds. Depending on accurate motion measurement, coronary arteries were imaged with tracking, in a 20-mm range of free breathing, with increased scan efficiency but without significant loss of image quality compared to multiple breathhold imaging.
Gatehouse
P D
PD
Magnetic Resonance Unit, Royal Brompton Hospital and National Heart & Lung Institute, Imperial College, London, UK. p.gatehouse@rbh.nthames.nhs.uk
Keegan
J
J
Yang
G Z
GZ
Mohiaddin
R H
RH
Firmin
D N
DN
D003331:Coronary Vessels / Q000033:anatomy & histology*; D017352:Echo-Planar Imaging; D006801:Humans; D021621:Imaging, Three-Dimensional; D009038:Motion