<prompt> The intensity of colour in Doppler isDirection flowVelocity of flowStrength of returning echoNone of the above  <response>: B i.e. Velocity of flow Colour doppler Colours are used to represent direction of flowQ towards away from the transducer; usually red is towards blue is away from transducer. Mn BA or AB Blue - Away; Red - Towards Shades intensity of colour represent velocity of flowQ; the paler shades representing higher velocity. Power doppler - Is good for showing areas of flowing blood, paicularly when it is moving slowly or in small vessels; but at the expense of losing directional velocity information. 