頸部領域を対象とした造影3D-MRAにおけるelliptical ecentric法と従来型centric法の比較

概要

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The purpose of this study was to evaluate k-space order in three-dimensional magnetic resonance angiography (3D-CE MRA) with intravenous bolus injection of contrast medium. It is important to use effectual k-space ordering to represent only the arterial phase. In addition, it is necessary to set an appropriate acquisition time after bolus injection. In this study, we compared elliptical centric encoding and conventional centric encoding in a flow phantom that simulated the cervical vasculature. We also carried out a clinical study. We found no difference between the two encoding methods in regard to the time to begin representation of the simulated blood vessels in the flow phantom, and obtained an appropriate starting point of scanning before venous return in an enhancement curve. In this case, however, central k-space data were acquired during the changing gadolinium concentration of the arterial phase. For this reason, artifacts occurred in images acquired by conventional centric encoding. In contrast, there were no artifacts in elliptical centric encoding, and the difference between the two encoding methods was significant in this respect. Accordingly, we concluded that elliptical centric encoding was useful for 3D-CE MRA of the cervical vasculature, which has a rapid venous return.
社団法人日本放射線技術学会の論文
2001-06-20