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    • 2. 发明申请
    • METHOD FOR GENERATING A RADIAL OR SPIRAL MRT IMAGE
    • 方法产生径向或螺旋形MRI录音
    • WO2016058876A3
    • 2016-10-13
    • PCT/EP2015073107
    • 2015-10-07
    • SIRONA DENTAL SYSTEMS GMBH
    • RASCHE VOLKERWUNDRAK STEFAN
    • G01R33/48G01R33/561G01R33/565
    • G01R33/5614G01R33/4824G01R33/56518
    • The invention relates to method for generating an MRI image in which a radial or spiral k-chamber path with a constant angular increment Psi is used to take an MRI image, the angular increment Psi being in the angular range of between 5 - 55 degrees or being in the corresponding supplementary angle Psi' and is selected according to the formula PsiN,M= pi / (N+1/ (M + tau - 1)). Alternatively, for an angular increment Psi which deviates from the angle increment of the optimal distribution of n radial profiles Psio p t = 180°/n, the minimum scanning efficiency of the angular increment Psi for n > 21 profiles is greater than 0.95, the angular increment Psi is in an angular range of 5 to less than 68,7537°, in particular between 5 - 55 degrees or in the corresponding supplementary angle Psi'. Compared to the arrangement of the radial or spiral profile using the golden angle of 111,24°, the angle increments calculated according to the above formula lead to lower eddy current artifacts, for example during the use of a b-SSFP-pulse sequence.
    • 一种制备MRI扫描,以创建在其中一个径向或螺旋k空间轨迹以恒定角度增量帕普西MRI图像中使用的过程,是在从5到55度的角度的角增量PSI或相应的补角帕普西 “和根据式PSIN选择,M = PI /(N + 1 /(M + tau蛋白 - 1))。 可替换地,角增量是Psi和从n个径向型面的最优分布的角度增量不同Psiopt = 180°/ n,其中所述角增量帕普西的最小采样效率比0.95对于n> 21条型材,在幽的角增量更大 角度的范围为5至小于68.7537°,尤其是5至55度或相应的补角PSI”。 与使用的111.24°金角度径向或螺旋形轮廓的布置中,在比较根据上述式角增量导致降低涡电流的工件,例如使用B SSFP脉冲序列作为时计算。