X-RAY INSPECTION WITH CONTEMPORANEOUS AND PROXIMAL TRANSMISSION AND BACKSCATTER IMAGING

摘要

AN X-RAY IMAGING INSPECTION SYSTEM FOR BAGS AND PACKAGES. TRANSMISSION IMAGING IS PERFORMED USING A FAN BEAM (25) AND A SEGMENTED DETECTOR (30), WHILE SCATTER IMAGING IS PERFORMED WITH A SCANNED PENCIL BEAM (35), WITH BOTH BEAMS ACTIVE SIMULTANEOUSLY. CROSS-TALK BETWEEN THE BEAMS IS MITIGATED BY A COMBINATION OF SHIELDING, SCATTER DETECTOR DESIGN, POSITIONING AND ORIENTATION, AND IMAGE PROCESSING. IMAGE PROCESSING SUBTRACTS THE MEASURED RADIATION SCATTERED FROM THE TRANSMISSION BEAM INTO THE SCATTER DETECTORS (40), REDUCING CROSS-TALK.