Contents -- 1 Ultrasound Bio-Safety survey for practicians - the current ECMUS -- policy (Christian Kallmann ) 1 -- 1.1 Ultrasound interactions 1 -- 1.1.1 Mechanical interactions 2 -- 1.1.2 Thermal interactions routine use 16 -- 1.5.1 Clinical Safety Statement 17 -- 1.5.2 Souvenir images 17 -- 1.6 Practical ultrasound awareness and -- safety related equipment maintenance 19 -- 1.7 References 20 -- 2 Methods for Ultrasound Image Parameters 57 -- 3.3 Sources of failures and degradation of ultrasound imagers 58 -- 3.3.1 US