Fig. 4
From: Three-step one-way model in terahertz biomedical detection
Medical and THz test results of human kidney tissues. a Normal tissue image. b Fibrosis tissue image. c THz absorption spectra of 14 samples of human kidneys. Lines with different colours represent different human kidney samples, and the corresponding error bars are labelled. The red dotted box shows the THz spectra of the biomarker L-hydroxyproline. The numbers 1–14 represent the 14 human renal fibrosis samples. d-e The difference between human normal and fibrotic tissues by the AH and THz-TDS methods. All data are normalized to their maximum