MAGNETIC RESONANCE IMAGING APPARATUS
First Claim
1. A magnetic resonance imaging apparatus comprising:
- a scan execution unit configured to;
execute a regular scan in which a navigator sequence for generating a magnetic resonance signal in a navigator area containing a region of interest moving with a biological movement of a subject and a high-signal substance and a low-signal substance sandwiching the region of interest therebetween; and
execute an imaging sequence for generating a magnetic resonance signal in an imaging area of the subject are carried out;
a signal processing unit configured to;
detect a position of the region of interest based on a magnetic resonance signal generated by a navigator sequence in the regular scan; and
generate an image based on the detected position and the magnetic resonance signal generated by the imaging, sequence;
an RF coil comprising a plurality of coil elements, said scan execution unit is configured to execute a pre-scan in which a navigator sequence is carried out before the regular scan is executed, said signal processing unit comprises;
a coil element selection unit configured to;
generate an intensity profile indicating a relation between a position in the navigator area in a predetermined direction from a first end thereof close to a high-signal substance to a second end thereof close to a low-signal substance and an intensity of a magnetic resonance signal, with respect to the magnetic resonance signal generated by the navigator sequence in the pre-scan and received at each of said coil elements;
determine a gradient polarity of a profile line corresponding to the high-signal substance in the predetermined direction in the generated intensity profile; and
select a coil element of said plurality of coil elements that received a magnetic resonance signal of the intensity profile highest in maximum signal intensity among the intensity profiles the gradient polarity of which was determined to face upward, wherein the position of the region of interest is detected based on a magnetic resonance signal generated by the navigator sequence in the regular scan and received at the selected coil element.
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Accused Products
Abstract
A magnetic resonance imaging apparatus includes a scan execution unit configured to execute a regular scan in which a navigator sequence for generating a magnetic resonance signal in a navigator area containing a region of interest moving with a biological movement of a subject and an imaging sequence for generating a magnetic resonance signal in an imaging area of the subject are carried out, and a signal processing unit configured to detect a position of a region of interest based on a magnetic resonance signal generated by a navigator sequence in the regular scan and to generate an image based on the detected position and the magnetic resonance signal generated by the imaging sequence. The signal processing unit is configured to generate an intensity profile with respect to the magnetic resonance signal generated by a navigator sequence in the pre-scan and received at each of the coil elements, determine the gradient polarity of the profile line corresponding to the high-signal substance in the predetermined direction in the generated intensity profile, and to select a coil element that received a magnetic resonance signal of the intensity profile highest in maximum signal intensity among the intensity profiles the gradient polarity of which was determined to face upward. The position of the region of interest is detected based on a magnetic resonance signal generated by a navigator sequence in the regular scan and received at the selected coil element.
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Citations
20 Claims
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1. A magnetic resonance imaging apparatus comprising:
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a scan execution unit configured to; execute a regular scan in which a navigator sequence for generating a magnetic resonance signal in a navigator area containing a region of interest moving with a biological movement of a subject and a high-signal substance and a low-signal substance sandwiching the region of interest therebetween; and execute an imaging sequence for generating a magnetic resonance signal in an imaging area of the subject are carried out; a signal processing unit configured to; detect a position of the region of interest based on a magnetic resonance signal generated by a navigator sequence in the regular scan; and generate an image based on the detected position and the magnetic resonance signal generated by the imaging, sequence; an RF coil comprising a plurality of coil elements, said scan execution unit is configured to execute a pre-scan in which a navigator sequence is carried out before the regular scan is executed, said signal processing unit comprises; a coil element selection unit configured to; generate an intensity profile indicating a relation between a position in the navigator area in a predetermined direction from a first end thereof close to a high-signal substance to a second end thereof close to a low-signal substance and an intensity of a magnetic resonance signal, with respect to the magnetic resonance signal generated by the navigator sequence in the pre-scan and received at each of said coil elements; determine a gradient polarity of a profile line corresponding to the high-signal substance in the predetermined direction in the generated intensity profile; and select a coil element of said plurality of coil elements that received a magnetic resonance signal of the intensity profile highest in maximum signal intensity among the intensity profiles the gradient polarity of which was determined to face upward, wherein the position of the region of interest is detected based on a magnetic resonance signal generated by the navigator sequence in the regular scan and received at the selected coil element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification