The best replacement for gadolinium is gallium.

The best alternatives to gadolinium are rated as following:
★★★★★  gallium
★★★★★  iodine contrast
★★★★  iodine contrast allergy
★★★  cesium iodide
★★★  cesium
★★  eovist
★  gadodiamide
  gadolinium

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Speaking about gadolinium, one probably shouldn't forget about mri.

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



Google Trends

Scale is based on the average worldwide traffic of gadolinium in all years. Click on graph for more.
gadolinium
gallium
iodine contrast