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1. 发明公开

EP3385742A1 METHOD AND APPARATUS FOR IDENTIFYING AT LEAST ONE MATERIAL COMPRISED IN A VOXEL 审中-公开
公开(公告)号：EP3385742A1
公开(公告)日：2018-10-10
申请号：EP17165079.9
申请日：2017-04-05
申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. , Julius-Maximilians-Universität Würzburg
发明人： Blaimer, Martin , Jakob, Peter
IPC分类号： G01R33/50 , G01R33/561
CPC分类号： G01R33/5614 , G01R33/50
摘要： The present invention discloses a method (500) for identifying at least one material (115) comprised in a voxel (120). The disclosed MR data acquisition method uses the transient phase of balanced steady-state free precession (bSSFP), which allows to simultaneously acquire quantitative information about longitudinal and transversal relaxation times T1 and T2 and relative proton density in multi-component systems. In one embodiment , these values are derived by combining signals from multiple acquisitions each of whom being realized by radio-frequency excitation pulses with different flip angles.The method is thus suitable for quantitative MRI T1 and T2 mapping. The method comprises a step of Reading in (510) at least a first (S 1 ) and a second (S 2 ) signal train, the first (S 1 ) and second (S 2 ) signal train each representing magnetization values being determined after the material (115) in the voxel (120) was exposed to predefined radio-frequency pulses (P 1 , P 2 ), wherein the predefined radio-frequency pulses (P 1 ) exposed to the material (115) in the voxel (120) before or during measuring the first signal train (S 1 ) differs in at least one parameter (α) from the radio-frequency pulses (P 2 ) exposed to the material (115) in the voxel (120) before or during measuring the second signal train (S 2 ). Furthermore, the method comprises a step of Performing (520) at least a time-domain-frequency-domain transformation, such as e.g. inverse Laplace transformation, in order to obtain a first (F 1 ) and a second (F 0 ) transformation value, the first transformation value (F 1 ) representing a frequency domain signal resulting from the time-domain-frequency-domain transformation on the basis of at least the first signal train (S 1 ) and the second transformation value (F 0 ) representing a frequency domain signal resulting from the time-domain-frequency-domain transformation on the basis of at least the second signal train (S 2 ). Finally the method comprises a step of Specifying (530) the material (115) using the first (F 1 ) and second (F 0 ) transformation values or values derived from the first (F 1 ) and/or second (F 0 ) transformation value, in order to identify the material (115).

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