Methods and systems for calibrating medical devices

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

• one or more layers of coil arrays, wherein
• the one or more layers of coil arrays are configured to obtain a magnetic flux variation of the MR device in at least one gradient direction to facilitate a calibration of a center of a gradient field domain of the MR device in the at least one gradient direction.

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

• one or more layers of coil arrays, wherein each layer of the one or more layers of coil arrays is arranged along at least one of a first direction and a second direction in a three-dimensional (3D) coordinate system;
• and
• at least one coil carrier configured to support the one or more layers of coil arrays, wherein the at least one coil carrier is arranged along a third direction in the 3D coordinate system.

A method for calibrating a medical device including a magnetic resonance (MR) device and a radiation therapy (RT) device, the method comprising:

• determining a first center of the RT device based on a first component of a calibration phantom;
• determining a second center of the MR device based on a second component of the calibration phantom;
• performing a calibration on at least one of the MR device or the RT device to cause the second center of the MR device to coincide with the first center of the RT device.