公开(公告)号：US20150323698A1

公开(公告)日：2015-11-12

申请号：US14272325

申请日：2014-05-07

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： SOUMYAJIT MANDAL ,  VAN D. M. KOROLEVA ,  TROY BORNEMAN ,  MARTIN D. HÜRLIMANN

IPC: G01V3/32 ,  G01V3/38 ,  G01V3/14

CPC classification number: G01V3/14 ,  G01V3/32 ,  G01V3/38

Abstract: A method for applying a nuclear magnetic resonance (NMR) sequence is described herein. The method includes applying a series of refocusing pulses to a substance within an inhomogeneous static magnetic field. Each refocusing pulse in the series of refocusing pulses includes a central axis, a total pulse duration greater than t180, and at least five segments (e.g., 5, 7, 11, 20, and 21). The phase of each segment is substantially anti-symmetric about the central axis of the refocusing pulse. In a more particular embodiment, the phase of each segment is also symmetric about the central axis of the refocusing pulse and the five segments include a substantially constant amplitude.

Abstract translation: 本文描述了应用核磁共振（NMR）序列的方法。 该方法包括将一系列重聚焦脉冲施加到非均匀静磁场内的物质。 一系列重聚焦脉冲中的每个再聚焦脉冲包括中心轴，大于t180的总脉冲持续时间和至少五个段（例如，5,7,11,20和21）。 每个段的相位关于重聚焦脉冲的中心轴基本上是反对称的。 在更具体的实施例中，每个段的相位也关于重聚焦脉冲的中心轴对称，并且五个段包括基本恒定的振幅。