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T2-weighted MR imaging with elimination of non-T2-weighted signal contributions
专利权人:
KONINKLIJKE PHILIPS N.V.
发明人:
Johannes Petrus Groen
申请号:
US15567388
公开号:
US10732242B2
申请日:
2016.04.15
申请国别(地区):
US
年份:
2020
代理人:
摘要:
An object positioned in an examination volume of a magnetic resonance (MR) device (1) is T2-weighted MR imaged such that the MR image is essentially free from interfering contributions from MR signals without T2 weighting. The object (10) is subject to a first T2 preparation sequence (T2PREP1) including an excitation RF pulse (21), one or more refocusing RF pulses (22), and a tip-up RF pulse (23). The object (10) is subject to a first readout sequence (RO1) including at least one excitation RF pulse and switched magnetic field gradients for acquiring a first set of MR signals. The object (10) is subject to a second T2 preparation sequence (T2PREP2) including an excitation RF pulse (21′;), one or more refocusing RF pulses (22′;), and a tip-up RF pulse (23′;). At least one of the RF pulses (21′;, 22′;, 23′;) of the second T2 preparation sequence (T2PREP2) has a different phase than the corresponding RF pulse (21, 22, 23) of the first T2 preparation sequence (T2PREP1). The object (10) is subject to a second readout sequence (RO2) including at least one excitation RF pulse and switched magnetic field gradients for acquiring a second set of MR signals. The MR image is reconstructed from the first and second sets of MR signals.
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