Fractal fluorescence decay (FFD) is used to analyze the autofluorescence behavior of biological structures and tissues. It provides biochemical information on tested samples. The non-contact and marker-free method does not require the samples to be prepared and allows examination in real time, which makes it easy to integrate into existing processes.
The method was developed in the context of optical cancer diagnosis (OCD). In addition to the analysis of biological structures, new areas of application have opened up to FFD as a non-destructive test method for technical and industrial topics.
FFD is based on laser-induced autofluorescence excitation and can be applied to individual points or as a two-dimensional matrix. The decay of the samples allows conclusions on the fractal dimension parameters, leading to biochemical information. This means that differential measurements are possible, in addition to collecting global information. Since it is fairly easy to set up, FFD can be combined well with other optical measurement methods. This allows for the comprehensive analysis and characterization of material samples.