Imaging with curved compression elements
View Patent ↗A curved compression element, such as a breast compression paddle, and imaging systems and methods for use with curved compression elements. A system may include a radiation source, a detector, and a curved compression element. Operations are performed that include receiving image data from the detector; accessing a correction map for the at least one compression paddle; correcting the image data based on the correction map to generate a corrected image data; and generating an image of the breast based on the corrected image data. The breast compression element generally has no sharp edges, but rather has smooth edges and transitions between surfaces. The breast compression paddle also includes a flexible material that spans a portion of a curved bottom surface of the breast compression paddle to define a gap. The flexible material may be a thin-film material such as a shrink wrap.
1. A system for imaging a breast, the system comprising:
a radiation source;
at least one compression paddle having a non-planar compression surface, wherein the at least one compression paddle is configured to compress the breast during imaging of the breast;
a detector configured to detect radiation emitted from the radiation source after passing through the at least one compression paddle and the breast, wherein the detector includes a plurality of pixels; and
a memory and a processor operatively connected to the detector, wherein the memory stores instructions that, when executed by the processor, perform a set of operations, the operations comprising:
receiving image data from the detector;
accessing a correction map for the at least one compression paddle;
correcting the image data based on the correction map to generate a corrected image data; and
generating an image of the breast based on the corrected image data.
2. The system of claim 1 , wherein the operations further comprise at least two of the following operations:
upscaling the correction map based on an image size for the image;
modifying the correction map by applying a squeeze factor;
modifying the correction map for a projection angle and a paddle shift; and
modifying the correction map based on a magnification.
3. The system of claim 2 , wherein modifying the correction map based on magnification is based at least in part on a height of the compression paddle.
4. The system of claim 1 , wherein the correction map is represented as a matrix, wherein the elements of the matrix represent correction values for a corresponding pixel of the detector.
5. The system of claim 4 , wherein the elements of the matrix include values for scaling a brightness value of the corresponding pixel of the detector.
6. The system of claim 1 , wherein correcting the image data includes correcting the image data on a pixel-by-pixel level.
7. The system of claim 1 , wherein the operations further comprise further correcting a chest-wall area of the image representative of an area within about 2 cm of a chest wall.
8. The system of claim 7 , wherein correcting the chest-wall area of the image includes determining a delta value based on at least slope value and a threshold value.
9. The system of claim 1 , wherein the correction map is generated by a process comprising:
filling the compression paddle with a liquid to create a filled paddle;
placing the filled paddle on a substantially radiolucent surface, wherein the radiolucent surface covers an imaging area of a detector;
passing radiation through the filled paddle and substantially radiolucent surface;
detecting the radiation passed through the filled paddle and substantially radiolucent surface;
generating a correction image based on the detected radiation;
identifying an average pixel value over the correction image; and
generating the correction map by dividing each pixel in the correction image by the average pixel value.
10. The system of claim 9 , wherein generating the correction map further comprises generating a series of polynomial fits to represent the correction map.