Mri system, method for determining sar value of mri system, and computer-readable storage medium

A method for determining a SAR value of a magnetic resonance imaging system, the magnetic resonance imaging system comprising a radio-frequency transmitting coil configured to receive radio-frequency power from a radio-frequency transmitting link and transmit radio-frequency power required for imaging to a scanned object, the method comprising:

• acquiring a frequency response of a first input reflection coefficient of the radio-frequency transmitting coil when having no load and a frequency response of a second input reflection coefficient thereof when having the scanned object;
• determining a resistance value of the radio-frequency transmitting coil on the basis of the frequency response of the first input reflection coefficient, and determining a parallel resistance value of the radio-frequency transmitting coil and the scanned object on the basis of the frequency response of the second input reflection coefficient;
• and
• calculating a SAR value of the scanned object on the basis of the resistance value of the radio-frequency transmitting coil and the parallel resistance value.

A magnetic resonance imaging system, comprising:

• a radio-frequency transmitting coil, configured to receive radio-frequency power from a radio-frequency transmitting link and transmit radio-frequency power required for imaging to a scanned object;
• a resistance value determining module, configured to acquire the ratio of resistance values of the radio-frequency transmitting coil and the scanned object;
• and
• a SAR value determining module, configured to determine total radio-frequency power absorbed by the radio-frequency transmitting coil and the scanned object when the radio-frequency power is transmitted to the radio-frequency transmitting coil, and calculate a SAR value of the scanned object on the basis of the ratio and the total radio-frequency power.