Magnetic resonance imaging apparatus with temperature measurement function
First Claim
1. A magnetic resonance imaging apparatus, comprising:
- imaging means for observing a magnetic resonance signal sequence by applying a slicing gradient magnetic field in a prescribed direction to a body to be examined placed in a static magnetic field, while applying radio frequency magnetic fields including a radio frequency selective excitation pulse and a plurality of radio frequency inversion pulses in prescribed intervals to the body to be examined according to a prescribed pulse sequence for producing the magnetic resonance signal sequence formed by a plurality of magnetic resonance signals; and
control means for controlling the imaging means to acquire image data and a phase information associated with a temperature change in an interior of the body to be examined, by displacing a timing in the pulse sequence for a prescribed magnetic resonance signal among said plurality of magnetic resonance signals constituting the magnetic resonance signal sequence, from a normal timing assigned to the prescribed magnetic resonance signal for acquiring only the image data.
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Accused Products
Abstract
A magnetic resonance imaging apparatus capable of measuring a temperature increase due to an application of RF magnetic fields for data acquisition purpose, and notifying an information on the measured temperature increase regularly to an operator, so as to secure the safety of a body to be examined. In this magnetic resonance imaging apparatus, the image data acquisition operation is controlled to acquire a phase information associated with a temperature change in an interior of the body to be examined, by displacing either an observation start timing or a radio frequency magnetic field application timing for a prescribed magnetic resonance signal in the magnetic resonance signal sequence from a normal timing for acquiring image data.
74 Citations
30 Claims
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1. A magnetic resonance imaging apparatus, comprising:
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imaging means for observing a magnetic resonance signal sequence by applying a slicing gradient magnetic field in a prescribed direction to a body to be examined placed in a static magnetic field, while applying radio frequency magnetic fields including a radio frequency selective excitation pulse and a plurality of radio frequency inversion pulses in prescribed intervals to the body to be examined according to a prescribed pulse sequence for producing the magnetic resonance signal sequence formed by a plurality of magnetic resonance signals; and control means for controlling the imaging means to acquire image data and a phase information associated with a temperature change in an interior of the body to be examined, by displacing a timing in the pulse sequence for a prescribed magnetic resonance signal among said plurality of magnetic resonance signals constituting the magnetic resonance signal sequence, from a normal timing assigned to the prescribed magnetic resonance signal for acquiring only the image data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of magnetic resonance imaging comprising the steps of:
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observing a magnetic resonance signal sequence by applying a slicing gradient magnetic field in a prescribed direction to a body to be examined placed in a static magnetic field, while applying radio frequency magnetic fields including a radio frequency selective excitation pulse and a plurality of radio frequency inversion pulses in prescribed intervals to the body to be examined according to a prescribed pulse sequence for producing the magnetic resonance sequence formed by a plurality of magnetic resonance signals; and controlling the imaging step to acquire image data an a phase information associated with a temperature change in an interior of the body to be examined, by displacing a timing in the pulse sequence for a prescribed magnetic resonance signal among said plurality of magnetic resonance signals constituting the magnetic resonance signal sequence, from a normal timing assigned to the prescribed magnetic resonance signal for acquiring only the image data.
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Specification