MAGNETIC RESONANCE IMAGING APPARATUS AND CONTROL METHOD THEREOF

摘要

Imaging is avoided being interrupted due to an actually measured SAR value, obtained by a fluctuation in an object's biological information, exceeding a limit value. For this, the CPU 71 computes the predicted SAR value in response to a period of the biological information to determine that the predicted SAR value does not exceed the limit value. The generation of the gradient magnetic field and the generation of the high frequency magnetic field are controlled on the basis of the determination, thereby performing an imaging operation. An MRI image is configured on the basis of the detected nuclear magnetic resonance signal.

主权项

1. A magnetic resonance imaging apparatus comprising:
a static magnetic field generation unit that generates a static magnetic field in a space in winch an object is accommodated; a gradient magnetic field generation unit that generates a gradient magnetic field so as to be superimposed on the static magnetic field; a high frequency magnetic field generation unit that generates a high frequency magnetic field to be emitted to the Object; a sequencer that controls the generation of the gradient magnetic field and the generation of the high frequency magnetic field in accordance with a pulse sequence; a signal detection unit that detects a nuclear magnetic resonance signal; control unit that computes a predicted SAR value; and a biological information reception unit that receives biological information of the object, wherein the sequencer controls the generation of the gradient magnetic field and the generation of the high frequency magnetic field in synchronization with the biological information, wherein the control unit computes a predicted SAR value to determine whether or not the predicted SAR value exceeds a limit value, on the basis of a length of a period of the biological information, and wherein the generation of the gradient magnetic field and the generation of the high frequency magnetic field are controlled to perform an imaging operation on the basis of the control unit determining that the predicted SAR value does not exceed the limit value, and an MRI image is generated on the basis of the nuclear magnetic resonance signal detected by the signal detection unit.