Real-time motion detection in spiral MRI using navigators.
A technique has been developed whereby motion can be detected in real time during the acquisition of data. This enables the implementation of an algorithm to accept or reject and reacquire data during a scan. Frames of data with motion are rejected and reacquired on the fly so that by the end of the scan, a complete motion-free data set has been acquired. The algorithm has been implemented on several different types of sequences. Preliminary in vivo studies indicate that motion artifacts are dramatically reduced.
Sachs
T S
TS
Department of Electrical Engineering, Stanford University, CA 94305.
Meyer
C H
CH
Hu
B S
BS
Kohli
J
J
Nishimura
D G
DG
Macovski
A
A
D000005:Abdomen / Q000033:anatomy & histology; D000465:Algorithms; D016477:Artifacts; D003199:Computer Systems; D003331:Coronary Vessels / Q000033:anatomy & histology; D005583:Fourier Analysis; D006321:Heart / Q000033:anatomy & histology; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D008099:Liver / Q000033:anatomy & histology; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D008961:Models, Structural; D008962:Models, Theoretical; D009038:Motion; D012119:Respiration; D013997:Time Factors