The best replacement for cat scan is ct scan.

The best alternatives to cat scan are rated as following:
★★★★★  ct scan
★★★★  mri
★★★★  pet scan
★★★  ultrasound
★  colonoscopy
★  xray
★  mri scan
★  sonogram
★  bone scan
  ct
  x ray
  an mri
  mammogram
  x-ray
  eeg
  ivp
  cat scan
  kat scan
  angiogram
  magnetic resonance imaging
  mri radiation

Your alternative for cat scan is not listed? Suggest!
Speaking about cat scan, one probably shouldn't forget about barium.

Other search terms related to cat scan and their ratings are:
★★★★★ barium
★ contrast dye
You have in mind a companion for cat scan and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cat scan in all years. Click on graph for more.
cat scan
ct scan
mri