期刊
MAGNETIC RESONANCE IN MEDICINE
卷 81, 期 3, 页码 1898-1906出版社
WILEY
DOI: 10.1002/mrm.27506
关键词
artifacts; gradient delay; radial imaging; RING; system imperfections; trajectory correction
资金
- DZHK (German Centre for Cardiovascular Research)
- Physics-to-Medicine Initiative Gottingen (LM der Niedersachsischen Vorab)
- DFG [UE 189/1-1]
Purpose: To develop a simple and robust tool for the estimation of gradient delays from highly undersampled radial k-space data. Theory: In radial imaging gradient delays induce parallel and orthogonal trajectory shifts, which can be described using an ellipse model. The intersection points of the radial spokes, which can be estimated by spoke-by-spoke comparison of k-space samples, distinctly determine the parameters of the ellipse. Using the proposed method (RING), these parameters can be obtained using a least-squares fit and utilized for the correction of gradient delays. Methods: The functionality and accuracy of the proposed RING method is validated and compared to correlation-based gradient-delay estimation from opposing spokes using numerical simulations, phantom and in vivo heart measurements. Results: In all experiments, RING robustly provides accurate gradient delay estimations even for as few as three radial spokes. Conclusions: The simple and straightforward to implement RING method provides accurate gradient delay estimation for highly undersampled radial imaging.
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