( ( ( ( ( ( ( The ( optimal ( ultrasound frequency ) ) ) ( for ( any application ) ) ) ( represesents ( ( ( a tradeoff ) ( between ( a ( -RRB- the ) ) ) ) ( need ( to ( ( acquire ( ultrasound images ) ) ( with ( ( a ( high degree ) ) ( of ( ( ( spatial resolution ) , ) ( ( dictating use ) ( of ( higher frequencies ) ) ) ) ) ) ) ) ) ) ) ) ) , ) and ) ( ( b -RRB- ) ( the ( need ( to ( ( obtain ( adequate ( `` ( penetration '' ) ) ) ) ( in ( the tissue ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (JJ optimal) (NN ultrasound) (NN frequency)) (PP (IN for) (NP (DT any) (NN application)))) (VP (VBZ represesents) (SBAR (S (NP (NP (DT a) (NN tradeoff)) (PP (IN between) (NP (DT a) (-RRB- -RRB-) (NNP the)))) (VP (VBP need) (S (VP (TO to) (VP (VB acquire) (NP (NN ultrasound) (NNS images)) (PP (IN with) (NP (NP (DT a) (JJ high) (NN degree)) (PP (IN of) (NP (NP (JJ spatial) (NN resolution)) (, ,) (NP (NP (NN dictating) (NN use)) (PP (IN of) (NP (JJR higher) (NNS frequencies)))))))))))))))) (, ,) (CC and) (S (LST (LS b) (-RRB- -RRB-)) (NP (DT the)) (VP (VBP need) (S (VP (TO to) (VP (VB obtain) (NP (JJ adequate) (`` ``) (NNS penetration) ('' '')) (PP (IN in) (NP (DT the) (NN tissue)))))))) (. .)))
The optimal ultrasound frequency for any application represesents a tradeoff between a) the need to acquire ultrasound images with a high degree of spatial resolution, dictating use of higher frequencies, and b) the need to obtain adequate &quot;penetration&quot; in the tissue.
(ROOT (S (NP (NP (NNP Ultrasound)) (, ,) (NP (DT a) (JJ diagnostic) (NN technology)) (, ,)) (VP (VBZ uses) (NP (NP (JJ high-frequency) (NNS vibrations)) (VP (VBN transmitted) (PP (IN into) (NP (NP (DT any) (NN tissue)) (PP (IN in) (NP (NN contact))))) (PP (IN with) (NP (DT the) (NN transducer)))))) (. .)))