Figure 1.

Interpretation of the NIRS chemogram and block chemogram. An example of a NIRS chemogram (A) and block chemogram (B) are shown. The X-axis of the chemogram represents the spatial location along the long axis of the vessel. The Y-axis of the chemogram represents circumferential position. Red regions of the chemogram correspond to locations having a low probability of LRP. Yellow regions of the chemogram correspond to locations having a higher probability of LRP. In this example NIRS has detected a moderate size LRP in the mid-segment and a small LRP in the proximal segment of the vessel. LRP, lipid-rich plaque; NIRS, near-infrared spectroscopy.