There are multiple definitions:

1. complex natural resonance(English)

   • used in microwave imaging
   • Imaging

2. contrast-to-noise ratio(English)

   • SIR, SNR, CMR
   • Bioengineering, Ratio-based metric, Medical imaging
   • https://doi.org…acc.2008.01.019
   • https://doi.org…147/IJN.S385679

3. Centrale Nederlandse Registratie(Dutch)

   • PALGA
   • Organizations (documentation), Pathology
   • https://www.ntv…ations/a366.pdf

4. Consiglio Nazionale delle Ricerche(Italian)

   • Organizations (research)
   • https://www.cnr.it/en