Systems and methods for manipulating changes in phase encodes
First Claim
Patent Images
1. A data collection method comprising:
- dividing a k space into (2I+1) regions, wherein the (2I+1) regions include a zeroth region positioned in a center of a phase encode axis, two first regions, and two Ith regions lying along the phase encode axis, wherein one of the first regions lies between the zeroth region and one of the Ith regions, a remaining region of the first regions lies between the zeroth region and a remaining region of the Ith regions;
repeating a magnetic resonance (MR) data collection from an nth region while changing n successively to fill the k space, wherein n ranges from 1 to I;
intermittently collecting MR data corresponding to the zeroth region after each successive change in n; and
inserting a pulse sequence for at least one time to collect data between the MR data collection from the nth region and said intermittently collecting the MR data corresponding to the zeroth region, wherein the pulse sequence corresponds to a phase encode amount that is included in one of the first regions, and the phase encode amount is represented by a polarity and a magnitude along the phase encode axis.
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Abstract
To reduce artifacts caused by sudden change of a phase encode amount, data Hj, Mj, and Lj having a large phase encode amount are collected, and then, when collecting data C3j-4, C3j-3, and C3j-2 having a small phase encode amount, a buffer pulse sequence having an intermediate phase encode amount (+9) or (+49) is inserted one or more times between both.
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Citations
24 Claims
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1. A data collection method comprising:
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dividing a k space into (2I+1) regions, wherein the (2I+1) regions include a zeroth region positioned in a center of a phase encode axis, two first regions, and two Ith regions lying along the phase encode axis, wherein one of the first regions lies between the zeroth region and one of the Ith regions, a remaining region of the first regions lies between the zeroth region and a remaining region of the Ith regions;
repeating a magnetic resonance (MR) data collection from an nth region while changing n successively to fill the k space, wherein n ranges from 1 to I;
intermittently collecting MR data corresponding to the zeroth region after each successive change in n; and
inserting a pulse sequence for at least one time to collect data between the MR data collection from the nth region and said intermittently collecting the MR data corresponding to the zeroth region, wherein the pulse sequence corresponds to a phase encode amount that is included in one of the first regions, and the phase encode amount is represented by a polarity and a magnitude along the phase encode axis. - View Dependent Claims (2, 3, 4)
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5. A data collection method comprising:
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dividing a k space into (2I+1) regions, wherein the (2I+1) regions include a zeroth region positioned in a center of a phase encode axis, two first regions, and two Ith regions lying along the phase encode axis, wherein one of the first regions lies between the zeroth region and one of the Ith regions, a remaining region of the first regions lies between the zeroth region and a remaining region of the Ith regions;
repeating a magnetic resonance (MR) data collection from an nth region while changing n successively to fill the k space, wherein n ranges from 1 to I;
intermittently collecting MR data corresponding to the zeroth region after each successive change in n; and
inserting;
when n equals one of 1 and 2, a first pulse sequence for (I−
1) times to collect data between the MR data collection from the nth region and said intermittently collecting the MR data corresponding to the zeroth region, wherein the first pulse sequence corresponds to a first phase encode amount that is included in one of the first regions, and the first phase encode amount is represented by a polarity and a magnitude along the phase encode axis; and
when n is at least equal to 3, a second pulse sequence for (I−
1) times to collect data between the MR data collection from the nth region and said intermittently collection the MR data corresponding to the zeroth region, wherein the second pulse sequence corresponds to a second phase encode amount that is included in an (n−
1)th region, and the second phase encode amount is represented by a polarity and a magnitude along the phase encode axis. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A data collection method comprising:
- collecting magnetic resonance (MR) data applying a first phase encode amount after each successive change in n ranging from 1 to I in a k-space divided into 2I+1 regions; and
inserting a pulse sequence, for at least one time, between said collecting MR data by applying the first phase encode amount and each successive change in n, wherein the pulse sequence corresponds to a second phase encode amount between the first phase encode amount and a third phase encode amount within the Ith region, and the first, second, and third phase encode mounts correspond to polarities and magnitudes along a phase encode axis.
- collecting magnetic resonance (MR) data applying a first phase encode amount after each successive change in n ranging from 1 to I in a k-space divided into 2I+1 regions; and
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14. An MRI system comprising:
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a magnet configured to apply a magnetic field to a subject;
a transmitting coil configured to excite spins within nuclei of the subject;
a gradient coil configured to apply at least one gradient to the magnetic field;
a receiving coil configured to receive an NMR signal generated from the spins to fill a k space;
a data collection device configured to divide the k space into (2I+1) regions, wherein the (2I+1) regions include a zeroth region positioned in a center of a phase encode axis, two first regions, and two Ith regions lying along the phase encode axis, wherein one of the first regions lies between the zeroth region and one of the Ith regions, a remaining region of the first regions lies between the zeroth region and a remaining region of the Ith regions, wherein said data collection device is configured to repeat a data collection from an nth region while changing n successively to fill the k, space and perform an intermittent collection of MR data corresponding to the zeroth region after each successive change in n, and n from 1 to I; and
a buffer pulse sequence inserting device configured to insert a pulse sequence for at least one time to collect data between the data collection from the nth region and the intermittent collection of the MR data corresponding to the zeroth region, wherein the pulse sequence corresponds to a phase encode amount that is included in one of the first regions, and the phase encode amount is represented by a polarity and a magnitude along the phase encode axis. - View Dependent Claims (15, 16)
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17. An MRI system comprising:
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a magnet configured to apply a magnetic field to a subject;
a transmitting coil configured to excite spins within nuclei of the subject;
a gradient coil configured to apply at least one gradient to the magnetic field;
a receiving coil configured to receive an NMR signal generated from the spins to fill a k space;
a data collection device configured to divide the k space into (2I+1) regions, wherein the (2I+1) regions include a zeroth region positioned in a center of a phase encode axis, two first regions, and two Ith regions lying along the phase encode axis, wherein one of the first regions lies between the zeroth region and one of the Ith regions, a remaining region of the first regions lies between the zeroth region and a remaining region of the Ith regions, wherein said data collection device is configured to repeat a data collection from an nth region while changing n successively to fill the k, space and perform an intermittent collection of MR data corresponding to the zeroth region after each successive change in n, wherein n ranges from 1 to I; and
a buffer pulse sequence inserting device configured to insert;
when n equals one of 1 and 2, a first pulse sequence for (I−
1) times to collect data between the data collection from the nth region and the intermittent collection of the MR data corresponding to the zeroth region, wherein the first pulse sequence corresponds to a first phase encode amount that is included in one of the first regions, and the first phase encode amount is represented by a polarity and a magnitude along the phase encode axis; and
when n is at least equal to 3, a second pulse sequence for (I−
1) times to collect data between the data collection from the nth region and the intermittent collection of the MR data corresponding to the zeroth region, wherein the second pulse sequence corresponds to a second phase encode amount that is included in an (n−
1)th region, and the second phase encode amount is represented by a polarity and a magnitude along the phase encode axis. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. An MRI system comprising:
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a magnet configured to apply a magnetic field to a subject;
a transmitting coil configured to excite spins within nuclei of the subject;
a gradient coil configured to apply at least one gradient to the magnetic field;
a receiving coil configured to receive an NMR signal generated from the spins to fill a k space;
a data collection device configured to collect data by applying a first phase encode amount after each successive change in n ranging from 1 to I in a k-space divided into 2I+1regions; and
a buffer pulse sequence inserting device configured to insert a pulse sequence, for at least one time, between collecting the data obtained by using the first phase encode amount and each successive change in n, wherein the pulse sequence corresponds to a second phase encode amount between the first phase encode amount and a third phase encode amount within the Ith region, and the first, second, and third phase encode amounts correspond to polarities and magnitudes along a phase encode axis.
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Specification