title: Schlieren metrology for high frequency medical ultrasound.
abstract: The increased use of medical ultrasound above 40 MHz poses the challenge of measuring beam features that may be less than 40 microm. We have successfully used the optical Schlieren technique for transducers operating as high as 110 MHz. After a brief discussion of the technique, results are presented, including comparisons to state-of-the-art hydrophones and wire targets.
authors.affiliation: Onda Corporation, 592 Weddell Drive, Suite 7, Sunnyvale, CA 94089, USA.
authors.forename: Claudio I
authors.initials: CI
authors.lastname: Zanelli
authors.forename: Samuel M
authors.initials: SM
authors.lastname: Howard
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation* / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D019047:Phantoms, Imaging; D011846:Radio Waves; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014463:Ultrasonography / Q000295:instrumentation* / Q000379:methods