In this issue you will find the following; Introduction aboout sound and ultrasound, sound wave properties,types of wave, sound equation, peizoelectricity, interaction of ultrasound with medium, attenuation of ultrasound beam,ultrasound velocity,Ultrasound modes, A-mode, B-mode, M-mode,Image resolution,Ultrasound beam &Ultrasound image formation,ultrasound image artifacts,Ultrasound biological effects.