MRI apparatus with energy control values and an SAR value calculated from a modified energy control value according to plural imaging conditions set before the MRI acquisition
First Claim
Patent Images
1. A magnetic resonance imaging (MRI) apparatus, comprising:
- an image generating unit configured to receive, from an imaging region of an object, magnetic resonance signals generated as a result of a transmission of an RF pulse and the image generating unit also being configured to generate image data of the object, based on the magnetic resonance signals received;
an RF output measuring unit coupled to an RF transmitter and configured to measure the RF pulse currently being transmitted and the RF output measuring unit also configured to output an energy control value representative thereof;
at least one energy control value correcting unit, configured to perform a correction operation, on said energy control value, that was output by the RF output measuring unit, in order to produce a modified energy control value, according to plural imaging conditions which were set before diagnostic MRI data acquisition began; and
at least one SAR (specific absorption rate) calculating unit configured to calculate at least one SAR value based on the produced modified energy control value;
wherein the at least one energy control value correcting unit is configured to perform respectively different correction operations, in order to produce the modified energy control value, depending on the imaging region of the object during use of the magnetic resonance imaging apparatus.
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Abstract
An MRI apparatus includes an image generating unit and an SAR calculating unit. The image generating unit receives a magnetic resonance signal generated as a result of transmission of an RF pulse from an object, and generates image data of the object based on the magnetic resonance signal. The SAR calculating unit performs a correction operation on an energy control value of the RF pulse according to an imaging condition, and calculates an SAR value based on an energy value subjected to the correction operation.
36 Citations
18 Claims
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1. A magnetic resonance imaging (MRI) apparatus, comprising:
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an image generating unit configured to receive, from an imaging region of an object, magnetic resonance signals generated as a result of a transmission of an RF pulse and the image generating unit also being configured to generate image data of the object, based on the magnetic resonance signals received; an RF output measuring unit coupled to an RF transmitter and configured to measure the RF pulse currently being transmitted and the RF output measuring unit also configured to output an energy control value representative thereof; at least one energy control value correcting unit, configured to perform a correction operation, on said energy control value, that was output by the RF output measuring unit, in order to produce a modified energy control value, according to plural imaging conditions which were set before diagnostic MRI data acquisition began; and at least one SAR (specific absorption rate) calculating unit configured to calculate at least one SAR value based on the produced modified energy control value; wherein the at least one energy control value correcting unit is configured to perform respectively different correction operations, in order to produce the modified energy control value, depending on the imaging region of the object during use of the magnetic resonance imaging apparatus. - View Dependent Claims (2, 3, 4, 5)
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6. A magnetic resonance imaging (MRI) apparatus, comprising:
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an image generating unit configured to receive, from an imaging region of an object, magnetic resonance signals generated as a result of a transmission of an RF pulse and the image generating unit also being configured to generate image data of the object, based on the magnetic resonance signals received; an RF output measuring unit coupled to an RF transmitter and configured to measure the RF pulse currently being transmitted and the RF output measuring unit also configured to output an energy control value representative thereof; at least one energy control value correcting unit, configured to perform a correction operation, on said energy control value, that was output by the RF output measuring unit, in order to produce a modified energy control value, according to plural imaging conditions which were set before diagnostic MRI data acquisition began; at least one SAR (specific absorption rate) calculating unit configured to calculate at least one SAR value based on the produced modified energy control value; and wherein the correction operation is performed on the energy control value, that was output by the RF output measuring unit, based, at least in part, on an estimated energy attenuation of the transmitted RF pulse along a path from a source of the RF pulse to an RF coil that then transmits the RF pulse into the object during use of the magnetic resonance imaging apparatus. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A magnetic resonance imaging (MRI) apparatus, comprising:
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an image generating unit configured to receive, from an imaging region of an object, magnetic resonance signals generated as a result of a transmission of an RF pulse and the image generating unit also being configured to generate image data of the object, based on the magnetic resonance signals received; an RF coil that transmits the RF pulse into the object on a bed; an RF output measuring unit coupled to an RF transmitter and configured to measure the RF pulse currently being transmitted and the RF output measuring unit also configured to output an energy control value representative thereof; at least one energy control value correcting unit, configured to perform a correction operation, on said energy control value, that was output by the RF output measuring unit, in order to produce a modified energy control value, according to plural imaging conditions which were set before diagnostic MRI data acquisition began; at least one SAR (specific absorption rate) calculating unit that calculates an SAR value based on said modified energy control value, and wherein the at least one energy control value correcting unit is configured to obtain bed position information during use of the magnetic resonance imaging apparatus and is also configured to perform the correction operation on the energy control value, that was output by the RF output measuring unit, based, at least in part, on an estimated energy attenuation depending on the bed position information received during use of the magnetic resonance imaging apparatus. - View Dependent Claims (15, 16, 17, 18)
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Specification