Methods and systems for calibrating medical devices

A method for calibrating a medical device implemented on a computing device having one or more processors and one or more storage devices, the medical device including a first device or a second device combined with the first device, the method comprising calibrating a second center of the second device using a calibration phantom, including:

• obtaining, by using the calibration phantom, a magnetic flux variation in at least one gradient direction in at least one portion of a spatial region within a gradient field domain of the second device;
• determining, based on the magnetic flux variation, the second center of the second device;
• and
• performing, based on the second center of the second device, a calibration on the second device to cause the second center of the second device to coincide with the first center of the first device.

A system for calibrating a medical device, the medical device including a magnetic resonance (MR) device, the system comprising:

• at least one storage medium including a set of instructions;
• at least one processor in communication with the at least one storage medium, wherein when executing the set of instructions, the at least one processor is directed to cause the system to perform operations including:
• obtaining, by using a magnetic flux measurement component, a magnetic flux variation in at least one gradient direction in at least one portion of a spatial region within a gradient field domain of the MR device;
• determining, based on the magnetic flux variation, a center of the gradient field domain of the MR device;
• and
• performing, based on the center of the gradient field domain, a mechanical adjustment on the MR device to locate the center of the gradient field domain at a target position, or adjusting, based on the center of the gradient field domain, an image reconstruction process performed on data generated by the MR device to correct or eliminate an impact of inaccuracy of the center of the gradient field domain on an image reconstructed based on the data.