Table 1.

Technical details and clinical implications of contrast-specific imaging techniques

High Power Intermittent Imaging	Acquisition difficulty	Amount of contrast used	Amplitude of micro-bubble backscatter	Dynamic range	Greyscale or colour	Processed Backscatter	Myocardial perfusion	Wall motion	Artefacts
Tissue Harmonic Imaging	challenging	low	high	wide	grey	harmonic	yes	no	yes
Ultraharmonic	challenging	low	high	wide	grey	harmonic	yes	no	yes
Pulse inversion	challenging	low	high	wide	grey	harmonic	yes	no	yes++
Harmonic Power Doppler	challenging	low	high	wide	colour	harmonic	yes	no	yes
Low Power Continuous Imaging
Power Pulse inversion	easy	high	low	narrow	colour	harmonic	yes	yes	yes
Power modulation	easy	high	low	narrow	either	fundamental	yes	yes	yes