Spin exciting method, magnetic resonance imaging method, and magnetic resonance imaging system
First Claim
1. A spin exciting method for producing an image using a magnetic resonance signal induced by spins in a subject being imaged according to the fast spin echo technique combined with the inversion recovery technique, comprising the steps of:
- exciting spins with application of a 180°
pulse;
exciting the spins with application of a first 90°
x pulse after the elapse of a first time;
exciting the spins with application of a 180°
y pulse after the elapse of a second time;
exciting the spins by applying the 180°
y pulse an odd number of times after the elapse of a third time that is double the second time; and
exciting the spins with application of a second 90°
x pulse after the elapse of the second time.
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Accused Products
Abstract
The present invention aims at making it possible to successfully achieve fast recovery during magnetic resonance imaging in which the fast spin echo technique combined with the inversion recovery technique is implemented. A 180° x pulse is applied in order to excite spins. Thereafter, when an inversion time TI has elapsed, a 90° x pulse is applied in order to excite the spins. Thereafter, when a half of a time esp has elapsed, a 180° y pulse is applied in order to excite the spins. Thereafter, when the time esp has elapsed, the 180° y pulse is applied an odd number of times in order to sequentially excite the spins. Thereafter, when a half of the time esp has elapsed, the 90° x pulse is applied in order to excite the spins.
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Citations
20 Claims
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1. A spin exciting method for producing an image using a magnetic resonance signal induced by spins in a subject being imaged according to the fast spin echo technique combined with the inversion recovery technique, comprising the steps of:
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exciting spins with application of a 180°
pulse;
exciting the spins with application of a first 90°
x pulse after the elapse of a first time;
exciting the spins with application of a 180°
y pulse after the elapse of a second time;
exciting the spins by applying the 180°
y pulse an odd number of times after the elapse of a third time that is double the second time; and
exciting the spins with application of a second 90°
x pulse after the elapse of the second time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A magnetic resonance imaging method for producing an image using a magnetic resonance signal induced by spins in a subject being imaged according to the fast spin echo technique combined with the inversion recovery technique, comprising the steps of:
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exciting spins with application of a 180°
pulse;
exciting the spins with application of a first 90°
x pulse after the elapse of a first time;
exciting the spins with application of a 180°
y pulse after the elapse of a second time;
exciting the spins by applying the 180°
y pulse an odd number of times after the elapse of a third time that is double the second time;
exciting the spins with application of a second 90°
x pulse after the elapse of the second time;
reading a spin echo during the third time; and
producing an image according to the spin echo. - View Dependent Claims (8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20)
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14. A magnetic resonance imaging system for producing an image using a magnetic resonance signal induced by spins in a subject being imaged according to the fast spin echo technique combined with the inversion recovery technique, comprising:
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a spin exciting device for exciting spins with application of a 180°
pulse, exciting the spins with application of a first 90°
x pulse after the elapse of a first time, exciting the spins with application of a 180°
y pulse after the elapse of a second time, exciting the spins sequentially by applying the 180°
y pulse an odd number of times after the elapse of a third time that is double the second time, and exciting the spins with application of a second 90°
x pulse after the elapse of the second time;
an echo reading device for reading a spin echo during the third time; and
an image producing device for producing an image according to the spin echo.
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Specification