Kirlian scan

A Kirlian scan is a type of medical procedure, a diagnostic technique used aboard Federation starships in the 23rd century.

It is a real-world technique that records electrical emissions from objects through photography.

History
In 2273, Doctor Christine Chapel used a Kirlian scan to diagnose Zantra, a long-lived Zaranite who suffered a seizure and collapsed, after which his left heart practically stopped beating. Zantra was placed on a biobed and underwent a body-scan. Chapel tried a variety of other techniques, including diasonics, but none helped her determine the cause of the heart failure.