Systems and methods for magnetic resonance scanning

A method for magnetic resonance imaging (MRI) scanning implemented on a computing device having a storage device and one or more processors, comprising:

• obtaining, by the one or more processors, an image of an object positioned on a scanning bed;
• determining, by the one or more processors, a posture of the object based on the image;
• obtaining, by the one or more processors, a first parameter of a pulse sequence to be applied to the object, the first parameter relating to radio frequency (RF) pulses applied to scan the object;
• determining, by the one or more processors, based on the posture and the first parameter of the pulse sequence to be applied, a specific-absorption rate (SAR) distribution model, wherein the SAR distribution model represents ratios of SARs with respect to different portions of the object to a total energy of the RF pulses;
• determining, by the one or more processors, based on a second parameter of the pulse sequence that is calibrated based on the first parameter and a characteristic of the object, the total energy of the RF pulses;
• estimating, by the one or more processors, based on the SAR distribution model and the total energy of the RF pulses, a SAR distribution associated with the object under the pulse sequence to be applied;
• determining, by the one or more processors, whether the estimated SAR distribution associated with the object meets a condition;
• determining, by the one or more processors in response to a determination that the estimated SAR distribution associated with the object under the pulse sequence meets the condition, noise information corresponding to the pulse sequence to be applied based on the first parameter of the pulse sequence;
• determining, by the one or more processors, whether a maximum noise value in the noise information is equal to or less than a noise threshold;
• adjusting, by the one or more processors in response to a determination that the maximum noise value in the noise information exceeds the noise threshold, the pulse sequence based on the noise information until an energy of the adjusted pulse sequence is less than a predetermined energy threshold and a maximum noise value of the adjusted pulse sequence is equal to or less than the noise threshold;
• and
• causing, by the one or more processors, a scanner to perform a magnetic resonance imaging (MRI) scan on the object according to the adjusted pulse sequence.

A non-transitory computer-readable medium comprising executable instructions that, when executed by a computing device, cause the computing device to:

• obtain an image of an object positioned on a scanning bed;
• determine, based on the image, a posture of the object;
• obtain a first parameter of a pulse sequence to be applied to the object, the first parameter relating to radio frequency (RF) pulses applied to scan the object;
• determine, based on the posture and the first parameter of the pulse sequence to be applied, a specific-absorption rate (SAR) distribution model, wherein the SAR distribution model represents ratios of SARs with respect to different portions of the object to a total energy of the RF pulses;
• determine the total energy of the RF pulses based on a second parameter of the pulse sequence that is calibrated based on the first parameter and a characteristic of the object;
• estimate, based on the SAR distribution model and the total energy of the RF pulses, a SAR distribution associated with the object under the pulse sequence to be applied;
• determine whether the estimated SAR distribution associated with the object meets a condition;
• determine, in response to a determination that the estimated SAR distribution associated with the object under the pulse sequence meets the condition, noise information corresponding to the pulse sequence to be applied based on the first parameter of the pulse sequence;
• determine whether a maximum noise value in the noise information is equal to or less than a noise threshold;
• adjust, in response to a determination that the maximum noise value in the noise information exceeds the noise threshold, the pulse sequence based on the noise information until an energy of the adjusted pulse sequence is less than a predetermined energy threshold and a maximum noise value of the adjusted pulse sequence is equal to or less than the noise threshold;
• and
• perform a magnetic resonance imaging (MRI) scan on the object according to the adjusted pulse sequence.