The best replacement for xray is mri.

The best alternatives to xray are rated as following:
★★★★★  mri
★★★  ultrasound
★★  ct
★  ct scan
★  gamma ray
★  an xray
★  cat scan
★  mri for knee
★  x-ray
  ct radiation
  scan
  normal xray
  xray
  regular chest xray
  gamma
  analog xray

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

Other search terms related to xray and their ratings are:
★★★★★ tb
You have in mind a companion for xray and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of xray in all years. Click on graph for more.
xray
mri
ultrasound