Siemens Acuson S1000 Instructions For Use Manual page 247

In general, use a transducer angle of 90 degrees to the skin surface for the highest

measurement accuracy.
An out-of-plane transducer angle less than 50 degrees to the skin surface can result in
artificially low shear wave velocities and elasticity values due to loss of transducer contact
with the flat scanning surface.
Transducer angle on a flat surface.
Maintain adequate contact and be aware of the effects of the transducer angle relative to

the contact surface.
When the transducer surface is in continuous contact with the skin surface and follows the
contour of the curved surface, shear wave velocity and elasticity measurements are
accurate and stable.
Transducer angle on a curved surface.
I n s t r u c t i o n s f o r U s e
1 0 V i r t u a l T o u c h A p p l i c a t i o n s
1 90-degree transducer angle
2 60-degree transducer angle
1 90-degree transducer angle
2 50-degree transducer angle
3 10-degree transducer angle
4 Vertical axis
1 0 - 1 3