METHOD AND MAGNETIC RESONANCE SYSTEM FOR IMAGING PARTICLES
First Claim
1. A method for imaging a particle located in an examination subject by implementing a magnetic resonance image data acquisition sequence in which at least a first gradient echo and a second gradient echo are acquired following a single excitation pulse while the examination subject is located in an applied basic magnetic field, said particle in said applied basic magnetic field causing a magnetic interference field, said magnetic resonance image data acquisition sequence comprising the steps of:
- radiating a radio-frequency (RF) pulse into the subject to generate a transverse magnetization in the subject with respect to a magnetization in the subject produced by the basic magnetic field;
shifting a first dephasing gradient to adjust a first dephasing of said transverse magnetization;
acquiring said first gradient echo;
shifting a second dephasing gradient to adjust a second dephasing of the transverse magnetization that is different from said first dephasing;
acquiring said second gradient echo; and
shifting said first and second dephasing gradients to cause a dephasing of the transverse magnetization caused by the interference field produced by the particle to be at least partially compensated in a region around or within the particle during acquisition of at least one of said first and second gradient echoes.
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Abstract
A method and magnetic resonance system for imaging a particle that is located in an examination subject with an imaging magnetic resonance measurement execute a gradient echo sequence in which at least two gradient echoes are acquired following a single excitation pulse, wherein the particle in an applied basic magnetic field causes a magnetic interference field. An RF pulse is radiated to generate a transverse magnetization from a magnetization appearing in the basic magnetic field. A first dephasing gradient is shifted to adjust a first dephasing of the transverse magnetization, and the first gradient echo is acquired. A second dephasing gradient is shifted to adjust a second dephasing of the transverse magnetization that is different than the first dephasing, and the second gradient echo is acquired. The two dephasing gradients are shifted such that a dephasing of the transverse magnetization caused by the interference field of the particle is at least partially compensated in a region around the particle or within the particle given the acquisition of at least one of the echoes.
23 Citations
15 Claims
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1. A method for imaging a particle located in an examination subject by implementing a magnetic resonance image data acquisition sequence in which at least a first gradient echo and a second gradient echo are acquired following a single excitation pulse while the examination subject is located in an applied basic magnetic field, said particle in said applied basic magnetic field causing a magnetic interference field, said magnetic resonance image data acquisition sequence comprising the steps of:
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radiating a radio-frequency (RF) pulse into the subject to generate a transverse magnetization in the subject with respect to a magnetization in the subject produced by the basic magnetic field; shifting a first dephasing gradient to adjust a first dephasing of said transverse magnetization; acquiring said first gradient echo; shifting a second dephasing gradient to adjust a second dephasing of the transverse magnetization that is different from said first dephasing; acquiring said second gradient echo; and shifting said first and second dephasing gradients to cause a dephasing of the transverse magnetization caused by the interference field produced by the particle to be at least partially compensated in a region around or within the particle during acquisition of at least one of said first and second gradient echoes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A magnetic resonance system comprising:
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a magnetic resonance data acquisition unit operable to image a particle located in an examination subject by implementing a magnetic resonance image data acquisition sequence in which at least a first gradient echo and a second gradient echo are acquired following a single excitation pulse while the examination subject is located in an applied basic magnetic field, said particle in said applied basic magnetic field causing a magnetic interference field; and a computerized control unit configured to operate said data acquisition unit to radiate a radio-frequency (RF) pulse into the subject to generate a transverse magnetization in the subject with respect to a magnetization in the subject produced by the basic magnetic field, shift a first dephasing gradient to adjust a first dephasing of said transverse magnetization, acquire said first gradient echo, shift a second dephasing gradient to adjust a second dephasing of the transverse magnetization that is different from said first dephasing, acquire said second gradient echo, and shift said first and second dephasing gradients to cause a dephasing of the transverse magnetization caused by the interference field produced by the particle to be at least partially compensated in a region around or within the particle during acquisition of at least one of said first and second gradient echoes.
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15. A non-transitory computer-readable data storage medium encoded with programming instructions, said medium being loaded into a computer system of a magnetic resonance system comprising a magnetic resonance data acquisition unit, and said programming instructions causing said computer system to operate said data acquisition system to:
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radiate a radio-frequency (RF) pulse into the subject to generate a transverse magnetization in the subject with respect to a magnetization in the subject produced by the basic magnetic field; shift a first dephasing gradient to adjust a first dephasing of said transverse magnetization; acquire said first gradient echo; shift a second dephasing gradient to adjust a second dephasing of the transverse magnetization that is different from said first dephasing; acquire said second gradient echo; and shift said first and second dephasing gradients to cause a dephasing of the transverse magnetization caused by the interference field produced by the particle to be at least partially compensated in a region around or within the particle during acquisition of at least one of said first and second gradient echoes.
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Specification