The best replacement for backscatter is millimeter.

The best alternatives to backscatter are rated as following:
★★★★★  millimeter
★★★★★  secondary electron
★★★★  millimeter wave
★★★  srp
★★★  millimeter wave scanner
★★★  polar pro
★★★  forward scatter
★★  blurfix
★★  gopro dive housing
★  mmw
  millimeter waves
  mm wave
  incendiary

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backscatter
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