Magnetic resonance imaging method and system capable of measuring short "T2" signal components
First Claim
1. A magnetic resonance (MR) imaging method comprising the steps of:
- applying a slice-selecting gradient field to a biological body under medical examination located in a static field;
applying a spin excitation pulse to the biological body while said slice-selecting gradient field is being applied thereto;
applying a refocusing pulse to the biological body after the application of said slice-selecting gradient field;
applying to the biological body, a rephasing gradient field having the same polarity of that of said slice-selecting gradient field Just after the application of said refocusing pulse; and
acquiring a spin echo signal induced in a slice of the biological body excited by said spin excitation pulse to obtain MR information of said excited slice.
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Abstract
A novel spin echo method and system applies a slice-selecting gradient field to a biological body under medical examination located in a static field during which time a spin excitation pulse is also applied to the biological body. A refocusing pulse is applied to the biological body after the application of the slice-selecting gradient field. A rephasing gradient field having the same polarity as the slice-selecting gradient field is applied just after the application of the refocusing pulse. A spin echo signal induced in a slice of the biological body excited by the spin excitation pulse is acquired to obtain MR information of the excited slice. The method reduces echo time and minimizes loss in T2 signal component. A magnetic resonance imaging system for carrying out the method is also disclosed.
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Citations
15 Claims
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1. A magnetic resonance (MR) imaging method comprising the steps of:
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applying a slice-selecting gradient field to a biological body under medical examination located in a static field; applying a spin excitation pulse to the biological body while said slice-selecting gradient field is being applied thereto; applying a refocusing pulse to the biological body after the application of said slice-selecting gradient field; applying to the biological body, a rephasing gradient field having the same polarity of that of said slice-selecting gradient field Just after the application of said refocusing pulse; and acquiring a spin echo signal induced in a slice of the biological body excited by said spin excitation pulse to obtain MR information of said excited slice. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A magnetic resonance (MR) imaging system comprising:
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first gradient field applying means for applying a slice-selecting gradient field to a biological body under medical examination located in a static field; first pulse applying means for applying a spin excitation pulse to the biological body while said slice-selecting gradient field is being applied thereto; second pulse applying means for applying a refocusing pulse to the biological body after the application of said slice-selecting gradient field; second gradient field applying means for applying to the biological body, a rephasing gradient field having the same polarity of that of said slice-selecting gradient field just after the application of said refocusing pulse; and means for receiving a spin echo signal induced in a slice of the biological body excited by said spin excitation pulse to process MR information of said excited slice. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification