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(ROOT (S (VP (VB Ultrasound) (NP (NP (DT A) (NN method)) (PP (IN of) (S (VP (VBG imaging) (NP (NP (DT the) (NN breast)) (VP (VBG using) (NP (JJ high) (NN frequency) (NN sound) (NNS waves))))))))) (. .)))
Ultrasound A method of imaging the breast using high frequency sound waves.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (NN sound)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (S (NP (DT a) (NN wave) (NN frequency)) (ADJP (JJR higher) (SBAR (IN than) (S (NP (DT the) (JJ human) (NN ear)) (VP (MD can) (VP (VB detect) (NP (NN ultrasound))))))))))))) (. .)))