____ artifact is the interference pattern resulting from constructive and destructive interference of echoes returning simultaneously from many scatterers. This artifact makes a gray-scale image appearing grainy.

The correct number of reflectors are displayed, but they appear at incorrect depth is called :reverberation or ring down

The beam diverges , resulting in a drop in intensity from curved structures _____________________

Tissue-equivalent phantom can be used to evaluate dead zone. To eliminate visualization problem associated with dead zone during scanning of superficial structure, which of the following can be placed between the transducer and the skin?

Accuracy of A-mode, M-mode and B-mode displaying the depth of reflectors from the transducer is called

Comet-tail and ring-down artifacts are two types of ____ artifact.

Doppler phantoms assess all the following characteristics except:

Enhancement is a result of

Refraction and beam diverging or spreading resulting in lateral misplacement and a drop in intensity of echoes causes _____ (artifact).

Comet-tail artifact occurs ____.