The best replacement for oct is ivus.

The best alternatives to oct are rated as following:
★★★★★  ivus
★★★★  hrt
★★★  gdx
★★★  mct
★★★  ccsi
★  config xml
  cirrus oct
  ubm
  dec
  optical coherence tomography
  cirrus

Your alternative for oct is not listed? Suggest!
Speaking about oct, one probably shouldn't forget about slo.

Other search terms related to oct and their ratings are:
★★★★★ slo
★★ optic nerve drusen
You have in mind a companion for oct and it is not yet here? Propose!



Google Trends

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oct
ivus
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