Table 4

Factors Affecting Detection of a FA by IVUS or NIRS

IVUS AttenuationNIRS-LRP
False positive (non-FA with attenuation)False negative (FA without attenuation)False positive (non-FA with LRP)False negative (FA without LRP)
Larger lipid poolCalcification focal FA (≤2 mm)
Larger lumen
Smaller plaque burden
Less necrotic core earlier stage of FA
PIT
Fibrocalcific plaque
Larger lipid pool
Larger plaque burden
Focal FA (≤2 mm)
Smaller plaque burden
Less necrotic core

LRP = lipid-rich plaque; other abbreviations as in Table 1.