Method and system for drift correction of spectrum images
View Patent ↗A method and system corrects for drift in spectrum images resulting from collection signals. Signals resulting from a scan are collected. A reference image is obtained for determining initial pixel locations. A correction image is extracted, validated and correction vectors generated.
1. A method of correcting for drift in spectrum images resulting from concurrently collected signals, comprising:
collecting concurrent signals resulting from a scan with an excitation source which are registered to x, y pixel positions on a sample for creating a spectrum image;
extracting a reference image from a plurality of frames of collected signals;
inserting pixel events corresponding to said frame of said reference image into initial pixel locations;
indexing forward to a next frame of collected signals and extracting a first correction image using the same signal source as the reference image;
validation checking said first correction image to determine if said first correction image is non-corrupt, and if said validation checking fails because the correction image is corrupt due to artifacts, repeating the method until a non-corrupt correction image is located; and
once a valid correction image is located, generating correction vectors for correcting the non-corrupt correction image, and other images resulting from different signal sources, which were concurrently collected for that frame.
2. The method according to claim 1 , wherein said signals result from an excitation source of at least one of an electron source, an x-ray source, an ion source, a photon source and an optical source.
3. The method according to claim 1 , wherein said collecting of signals is conducted by collecting signals from the excitation source.
4. The method according to claim 1 , wherein said collecting of signals is conducted by collecting signals from the sample.
5. The methods according to claim 1 , further comprising concurrently collecting all signals for each frame prior to processing.
6. The method according to claim 1 , wherein said validation is conducted by qualifying the spatial integrity of the image.
7. The method according to claim 1 , wherein if validation fails, skipping the frame of the first correction image to the next frame until a non-corrupt image is located.
8. The method according to claim 6 , wherein if validation fails, skipping the frame of the first correction image to the next frame until a non-corrupt image is located.
9. The method according to claim 1 , wherein once a valid correction image is located, realigning the correction image to the reference image.
10. The method according to claim 6 , wherein once a valid correction image is located, realigning the correction image to the reference image.
11. A system for acquiring spectrum images resulting from concurrently collected signals, and for correcting for drift in the spectrum images resulting from the concurrently collected signals, the system including a scan generator for generating a scan of a sample, detectors for collecting signals registered to x, y pixel positions of the beam on the sample, the system further comprising processors, related components and memory, and said processor, related components and memory being programmed for:
generating a scan with said scan generator which is an excitation source for scanning and exciting a sample;
collecting concurrent signals with said detectors, resulting from a scan with a scan generator for creating a spectrum image;
extracting a reference image from a plurality of frames of collected signals;
inserting pixel events corresponding to said frame of said reference image into initial pixel locations;
indexing forward to a next frame of collected signals and extracting a first correction image using the same signal source as the reference image;
validation checking said first correction image to determine if said first correction image is non-corrupt and if said validation checking fails because the correction image is corrupt due to artifacts, repeating the validation checking until a non-corrupt correction image is located; and
once a valid correction image is located, generating correction vectors for correcting the non-corrupt correction image, and other images resulting from different signal sources, which were concurrently collected for that frame.
12. The system according to claim 11 , wherein said scan generator is of the type which is at least one of an electron source, an x-ray source, an ion source, a photon source and an optical source.
13. The system according to claim 11 , further configured for collecting the signals from the excitation source.
14. The system according to claim 11 , further configured for collecting the signals from the sample.
15. The system according to claim 11 , wherein the system is further programmed for concurrently collecting all signals for each frame prior to processing.
16. The system according to claim 11 , further configured for conducting said validation by qualifying the spatial integrity of the image.
17. The system according to claim 11 , further configured for skipping the frame of the first correction image if validation fails, to the next frame until a non-corrupt image is located.
18. The system according to claim 16 , further configured for skipping the frame of the first correction image if validation fails, to the next frame until a non-corrupt image is located.
19. The system according to claim 11 , further configured for, once a valid correction image is located, realigning the correction image to the reference image.
20. The system according to claim 16 , further configured for, once a valid correction image is located, realigning the correction image to the reference image.