Table 2.

Similarities and differences of IVUS and IVUS-based imaging modalities

	Gray-scale IVUS	VH	i-MAP	Integrated backscatter	Echogenicity
Type of device	Mecanical and electrical	Mechanical and electrical	Mechanical	Mechanical	As IVUS
Transducer frequency	20–40 MHz	20–45 MHz	40 MHz	40 MHz	As IVUS
Colour code	Gray-scale	Fibrous: green	Fibrous: light green	Fibrous: green	Gray-scale
		Necrotic core: red	Necrotic core: pink	Necrotic core: blue
		Callcium: white	Calcium: blue	Calcium: red
		Fibrofatty: light green	Fibrofatty: yellow	Fibrofatty: yellow
Backscatter radiofrequency signal analysis	Amplitude (dB)	Autoregressive model	Fast Fourier trannformation	Fast Fourier transformation	Computer analysis