T2-weighted MR imaging with non-T2-weighted signal contribution removed

摘要

The present invention relates to a method for MR imaging of an object placed in an inspection volume of an MR device 1. The present invention aims to enable T2-weighted MR imaging that has substantially no interference contribution from MR signals without T2-weighted. The method of the present invention comprises: a) subjecting an object 10 to a first T2 preparation sequence T2PREP1 comprising an excitation RF pulse 21, one or more refocusing RF pulses 22 and a tip-up RF pulse 23; b) Subjecting the object 10 to a first readout sequence RO1 comprising at least one excitation RF pulse and a switched magnetic field gradient to obtain a set of MR signals; and c) subjecting the object 10 to the excitation RF Receiving a second T2 preparation sequence T2PREP2 comprising a pulse 21 ′, one or more refocusing RF pulses 22 ′ and a chip-up RF pulse 23 ′, the RF pulse 21 ′ of the second T2 preparation sequence T2PREP2 , 22 ', 23' is a first T2 preparation sequence The above steps having a phase different from the corresponding RF pulse 21, 22, 23 of T2PREP1, and d) at least one excitation RF pulse and switching on the object 10 to obtain a second set of MR signals Receiving a second readout sequence RO2 including the generated magnetic field gradient; and e) reconstructing an MR image from the first and second sets of MR signals. The invention further relates to an MR device and a computer program for the MR device.