In nuclear medicine, "tracers" are used for myocardial perfusion imaging. A "4k" file in this context could be a high-resolution 4K dataset or configuration for a specific imaging system.
Layouts, maps, or high-resolution (4K) visual overlays for a dashboard or interface. Idemi_Tracer_3_4k.zip
If you downloaded this file from an unverified source, it is highly recommended to scan it with an antivirus tool before extracting, as .zip files are frequently used to distribute malware disguised as technical tools. In nuclear medicine, "tracers" are used for myocardial