Methods and systems for determining radiation field information

A method for determining radiation field information, comprising:

• obtaining a candidate beam angle range for an object;
• wherein the candidate beam angle range includes a candidate beam angle range determined by at least one processing device for the object based on information of the object, or determined based on user input information;
• for at least one candidate beam angle of the candidate beam angle range, determining at least one candidate lock field parameter corresponding to the candidate beam angle based on a region of interest projection and/or a radiation field projection;
• and
• determining target radiation field information based on the at least one candidate lock field parameter.

A non-transitory computer readable medium storing instructions, the instructions, when executed by at least one processor, causing the at least one processor to implement a method for determining radiation field information comprising:

• obtaining a candidate beam angle range for an object;
• wherein the candidate beam angle range includes a candidate beam angle range determined by at least one processing device for the object based on information of the object, or determined based on user input information;
• for at least one candidate beam angle of the candidate beam angle range, determining at least one candidate lock field parameter corresponding to the candidate beam angle based on a region of interest projection and/or a radiation field projection;
• and
• determining target radiation field information based on the at least one candidate lock field parameter.