Correlation artifacts in speed of sound estimation in scattering media

Ophir, Jonathan; Johnson, Walter H.; Yazdi, Youseph; Shattuck, David P.; Mehta, Deepak

doi:10.1016/0301-5629(89)90046-x

Cited by 10 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The distance between the tracked points is not, then, simply the distance between the axes of ultrasound tracking beams, but rather a function of the two-way beam pattern and scatterer distribution at a given depth. A similar effect was noted by Ophir et al in pulse-echo estimates of ultrasonic sound speed estimation [7]. Tracking beam spacings are on the order of 1–4 mm, while beamwidths can be on the order of 0.2–0.5 mm.…”

Section: Introductionsupporting

confidence: 76%

New Fabrication Techniques for Ring-Array Transducers for Real-Time 3D Intravascular Ultrasound

2009

View full text Add to dashboard Cite

We have previously described miniature 2D array transducers integrated into a Cook Medical, Inc. vena cava fi ter deployment device. While functional, the fabrication technique was very labor intensive and did not lend itself well to efficient fabrication of large numbers of devices. We developed two new fabrication methods that we believe can be used to efficiently manufacture these types of devices in greater than prototype numbers. One transducer consisted of 55 elements operating near 5 MHz. The interelement spacing is 0.20 mm. It was constructed on a flat piece of copper-clad polyimide and then wrapped around an 11 French catheter of a Cook Medical, Inc. inferior vena cava (IVC) filter deployment device. We used a braided wiring technology from Tyco Electronics Corp. to connect the elements to our real-time 3D ultrasound scanner. Typical measured transducer element band width was 20% centered at 4.7 MHz and the 50 Ω round trip insertion loss was -–82 dB. The mean of the nearest neighbor cross talk was –37.0 dB. The second method consisted of a 46-cm long single layer flex circuit from MicroConnex that terminates in an interconnect that plugs directly into our system cable. This transducer had 70 elements at 0.157 mm interelement spacing operating at 4.8 MHz. Typical measured transducer element bandwidth was 29% and the 50 Ω round trip insertion loss was –83 dB. The mean of the nearest neighbor cross talk was –33.0 dB.

show abstract

Section: Introductionsupporting

confidence: 76%

New Fabrication Techniques for Ring-Array Transducers for Real-Time 3D Intravascular Ultrasound

2009

View full text Add to dashboard Cite

show abstract

“…Ο Ophir [197] [198] , [199]. Ωστόσο, μια ομάδα (Lin) [200] μελέτησε την ταχύτητα του ήχου σε 45 περιπτώσεις ήπατος (21 φυσιολογικά, 7 με λιπώδη διήθηση, και 7 με ίνωση) χρησιμοποιώντας καθιερωμένες in vitro τεχνικές, ωστόσο δεν βρήκαν σημαντική συσχέτιση μεταξύ της ταχύτητας και της ανατομικής δομής.…”

Section: In Vivo αποτελέσματα εξασθένησης στο ήπαρunclassified

Γενικευμενο Συστημα Υποστηριξης Για Διαγνωση Και Κλινικοτεχνολογικη Αξιολογηση Της Υπερηχοτομογραφικης Εικονας

Κοννησ¹

View full text Add to dashboard Cite

show abstract

A transaxial compression technique (TACT) for localized pulse-echo estimation of sound speed in biological tissues

Ophir¹,

Yazdi²

1990

Ultrasonic Imaging

View full text Add to dashboard Cite

Correlation artifacts in speed of sound estimation in scattering media

Cited by 10 publications

References 8 publications

New Fabrication Techniques for Ring-Array Transducers for Real-Time 3D Intravascular Ultrasound

New Fabrication Techniques for Ring-Array Transducers for Real-Time 3D Intravascular Ultrasound

Γενικευμενο Συστημα Υποστηριξης Για Διαγνωση Και Κλινικοτεχνολογικη Αξιολογηση Της Υπερηχοτομογραφικης Εικονας

A transaxial compression technique (TACT) for localized pulse-echo estimation of sound speed in biological tissues

Contact Info

Product

Resources

About