Table 4.

Expected ARF-induced responses of different plaque features in parametric images, presented to the reader as part of the training regimen. A ‘−’ indicates that the metric should be low relative to adjacent arterial tissue (i.e. peak displacement of calcium should be relatively low). A ‘+’ indicates that the metric should be high relative to adjacent arterial tissue (i.e. recovery time of a disrupted IEL should be relatively high). A ‘0’ indicates that the metric should remain unchanged. A ‘/’ is used to indicate a situation where two results may occur (i.e. recovery time with collagen deposition may be decreased, or may be unchanged). Multiple symbols, e.g. ‘+++’, indicate that the metric is expected to change substantially.

Tissue Classification	PD	RT	SWV
Collagen Deposition	−	−/0	+
Disrupted IEL	0	+	−/0
Calcium Deposition	−	0	+
Lipid Pool/Necrosis	+++	0	−
Fibrous Cap	−	−/0	+