Method of magnetic resonance with excitation by a prewinding pulse
First Claim
1. A method of magnetic resonance for examination of a sample introduced into a measurement volume within an external magnetic field, the method comprising the steps of:
- a) exciting the sample using an excitation pulse, wherein the excitation pulse is a prewinding pulse generating a transverse magnetization M⊥
(ω
) of spins of different Larmor frequency ω
after the excitation pulse, the transverse magnetization having a phase φ
0(ω
), wherein φ
0(ω
), as a function of ω
within a predefined frequency range Δ
ω
, has an approximately linear course with negative slope, such that spins refocus to form a spin echo after an end of the excitation pulse at an echo time, wherein the echo time is defined by the excitation pulse and is larger than the duration of the excitation pulse, with no additional refocusing pulse or refocusing gradient thereby being necessary; and
b) reading out, after a time interval and using a receiving coil, a signal formed by the transverse magnetization produced in step a).
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Abstract
A method of magnetic resonance, in which a sample introduced in a measurement volume in an external magnetic field is excited by an excitation pulse and the signal formed by the transverse magnetization thus produced is read out by a receiving coil. The method is characterized in that a prewinding pulse is used as the excitation pulse, which prewinding pulse is characterized in that the formed transverse magnetization M⊥(ω) of spins of different Larmor frequency ω after the pulse has a phase φ0(ω), wherein φ0(ω) as a function of ω within a predefined frequency range Δω has an approximately linear course having negative slope, such that the spins refocus after an echo time defined by the pulse without an additional refocusing pulse being necessary.
11 Citations
19 Claims
-
1. A method of magnetic resonance for examination of a sample introduced into a measurement volume within an external magnetic field, the method comprising the steps of:
-
a) exciting the sample using an excitation pulse, wherein the excitation pulse is a prewinding pulse generating a transverse magnetization M⊥
(ω
) of spins of different Larmor frequency ω
after the excitation pulse, the transverse magnetization having a phase φ
0(ω
), wherein φ
0(ω
), as a function of ω
within a predefined frequency range Δ
ω
, has an approximately linear course with negative slope, such that spins refocus to form a spin echo after an end of the excitation pulse at an echo time, wherein the echo time is defined by the excitation pulse and is larger than the duration of the excitation pulse, with no additional refocusing pulse or refocusing gradient thereby being necessary; andb) reading out, after a time interval and using a receiving coil, a signal formed by the transverse magnetization produced in step a). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification