| 摘要 |
The invention pertains to the field of medical imaging by fluoroscopy. The invention relates to a method for reducing the noise in a sequence of fluoroscopic images acquired by an X-ray detector. The method according to the invention includes the following consecutive steps for each image (xn) of the sequence: applying temporal filtering (22) to the image (xn) acquired at a moment n, said temporal filtering comprising fluoroscopic noise reduction (FNR) processing; and applying spatial filtering (23) to the image (yn) acquired at the moment n, said spatial filtering comprising the following sub-steps: transforming (231) the image (yn) acquired at the moment n from the spatial domain into the curvelet domain by means of a curvelet transform, each transformed image being represented by a set of coefficients; thresholding (232) the coefficients of the image (yn) by means of a thresholding function, the thresholding function suppressing the coefficients that are less than a third predetermined threshold, and keeping or adjusting the coefficients that are greater than the third predetermined threshold; and transforming (233) the image (zn), the coefficients of which have been thresholded, from the curvelet domain into the spatial domain by means of an inverse curvelet transform. |
