Methods and systems for dynamic collimation

A method for an x-ray system, comprising:

• during an image-guided interventional procedure,
• prior to selecting a target, performing a first tomosynthesis scan of a compressed breast with first collimation at a plurality of angular positions of an x-ray source of the x-ray system;
• reconstructing a first set of images from first tomosynthesis scan data;
• responsive to target selection from the first set of images, performing a second tomosynthesis scan of the compressed breast with second collimation at the plurality of angular positions of the x-ray system;
• and
• reconstructing a second set of images from first tomosynthesis scan data;
• wherein the first collimation is based on a greater volume of interest;
• and
• wherein the second collimation is based on a reduced volume of interest.

An imaging system, comprising:

• a radiation source rotating within an angular range about an axis of the imaging system;
• a collimator to adjust emission of radiation from the radiation source;
• a detector for receiving radiation rays from the radiation source via the collimator and generating a plurality of projection images of a specimen positioned between the radiation source and the detector;
• a compression paddle for positioning the specimen between the compression paddle and the detector;
• a biopsy device including a biopsy tool and a biopsy needle mounted on the biopsy tool, the biopsy device coupled to the imaging system and positioned between the radiation source and the detector;
• and
• a processor with executable instructions stored in non-transitory memory for:
• prior to receiving biopsy target coordinates,
• adjusting one or more collimator blades to irradiate an area on the detector based on a whole volume of specimen, and performing a first tomosynthesis scan by adjusting one or more collimator blade positions at each angular position of the radiation source;
• reconstructing first set of images from the first tomosynthesis scan;
• displaying the first set of images on a user interface of the imaging system;
• responsive to receiving biopsy target coordinates,
• determining a reduced volume of interest based on the biopsy target coordinates, compressed breast thickness, and one or more compression paddle parameters;
• determining a corresponding area to irradiate on the detector based on the reduced volume of interest for each radiation source angular position;
• performing a second tomosynthesis scan by adjusting one or more collimator blades at each radiation source angular position based on the corresponding area to irradiate;
• reconstructing second set of images from the first tomosynthesis scan;
• and
• displaying the second set of images on the user interface.