System and method for pretreatement imaging in adaptive radiation therapy

A computer-implemented method for adapting a treatment plan, the method comprising the following operations performed by at least one processor:

• obtaining a planning image of a region of interest relating to a first treatment fraction of a first treatment plan;
• obtaining a first image of the region of interest relating to a first scan of the region of interest with a first dose level;
• comparing the planning image with the first image to generate a first comparison result;
• determining whether the first comparison result satisfies a first replanning condition;
• causing, in response to a determination that the first comparison result satisfies the first replanning condition, one or more scanners to perform a second scan with a second dose level to provide a second image;
• and
• generating a second treatment plan according to the second image,
• wherein the second dose level is higher than the first dose level.

A non-transitory computer-readable storage medium including instructions that, when accessed by at least one processor of a system, causes the system to perform a method including:

• obtain a planning image of a region of interest relating to a first treatment fraction of a first treatment plan;
• obtain a first image of the region of interest relating to a first scan of the region of interest with a first dose level;
• compare the planning image with the first image to generate a first comparison result;
• determine whether the first comparison result satisfies a first replanning condition;
• cause, in response to a determination that the first comparison result satisfies the first replanning condition, one or more scanners to perform a second scan with a second dose level to provide a second image;
• and
• generate a second treatment plan according to the second image,
• wherein the second dose level is higher than the first dose level.