RID12442 pulse sequence

definition Set of RF (and/or gradient) magnetic field pulses and time spacings between these pulses; used in conjunction with magnetic field gradients and MR signal reception to produce MR images. from ACR glossary

comment For a spin echo pulse sequence the following notation is used: <Sequence Type > : (SE_<Index1> GRE_<Index2>)_<Index3>. Here, <Index1> and <Index2> denote the number of spin echoes and gradient echoes, respectively. The values of <Index1> and <Index2> can be either integer numbers or formulas of the variables N and M. Here, N describes the total number of k-space lines, and M is the number of k-space lines per excitation. The part „GRE_<Index2>“ or „SE_<Index2>“ is omitted, if <Index2> is zero. <Index3> denotes the number of required RF excitations and is given either as an integer number or a formula of the variables N and M. For a gradient echo pulse sequence the following notation is used: < Sequence Type > : (GRE_<Index1> SE_<Index2>)_<Index3>. Here, <Index1> and <Index2> denote the number of spin echoes and gradient echoes, respectively. The values of <Index1> and <Index2> can be either integer numbers or formulas of the variables N and M. Here, N describes the total number of k-space lines, and M is the number of k-space lines per excitation. The part „GRE_<Index2>“ or „SE_<Index2>“ is omitted, if <Index2> is zero. <Index3> denotes the number of required RF excitations and is given either as an integer number or a formula of the variables N and M.]