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August 2014 • SMT Magazine 53 INtRODuCtION tO INLINE aXI tEChNOLOgy continues aRTIClE While the slice projections obtained through digital tomosynthesis have lower resolution due to the lower number of source images, they exhibit higher contrast than laminography and are captured at significantly faster speed than a full CT scan. These qualities make digital tomo- synthesis the dominant AXI technology for live production runs, allowing reliable near-real- time inspection while optimizing image qual- ity as necessary by acquiring additional source images. Which X-ray Inspection to use? 3D AXI • Double-sided boards and multilayer components (PoP) • High-density shielded connectors • High-speed, high-resolution inspection 2D AXI • Single-sided boards • High speed, very high-resolution inspection 2.5D AXI • Detector/board tilt for virtual 3D • Small overlap of components Figure 8: Reconstruction using Tomosynthesis induces some blurring, but offers much higher contrast than comparable laminographic images. Figure 10: objects at different slice height project to different locations. by aligning the projections on the images from each camera, we can get clear 3D slice images at the desired height while blurring out all other parts at different levels. Figure 9: Tomosynthesis X-ray systems use a source tube paired with an array of cameras to capture each location of the inspected object un- der a predefined set of angles.