■ Sample Volume
When Sample Volume is positioned over the blood flow in a 2D image, the Doppler Spectrum is displayed. Information on the size and depth of Sample Volume is displayed in [mm] units. The position is displayed in the ‘xx.x@yy.y mm’ format. This means that a Sample Volume of size ‘xx.x mm’ is located ‘yy.y mm’ deep. For example, ‘2.0@16.7mm’ means that a Sample Volume of size 2.0 mm is located 16.7 mm deep.