Zero echo time MR imaging with water / fat separation

摘要

The present invention relates to an MR imaging method of an object placed in an inspection volume of the MR apparatus 1.It is an object of the present invention to enable "silent" zero echo time (ZTE) imaging in combination with water / fat separation.According to the present invention, an MR imaging method of an object placed within an inspection volume of an MR apparatus is disclosed.The method of the present invention isThe first self refocusing zero echo time imaging sequence is applied to the subjectThe gradient echo signal of the first sequence is obtained as a radial k-space spoke of the first number N1 at a first repetition timeThe radial k-space spoke of the first number N1 forms a first closed orbit in the K spaceAndThe step of applying a second self refocusing zero echo time imaging sequence to said subjectThe gradient echo signal of the second sequence is obtained as a radial k-space spoke of a second number N2 at a second repetition timeThe radial k-space spoke of the second number N2 forms a second closed orbit in the K spaceN2 is not equal to N1 and / or TR2 is not equal toAndThe MR image is reconstructed from the acquired gradient echo signal.The signal contribution of two or more chemical species (e.g., water and fat) to the gradient echo signal can be separated using different echo times attributable to each gradient echo signal in the gradient echo signal of said first and second sequences.The present invention also relates to a computer program for an MR apparatus and an MR apparatus.