We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
A Catheter-Tip Ultrasonic Transducer for Measuring Pulsatile Aortic Diameter and Pressure Elastic Modulus.
- Authors
Grahn, Allen R.; Paul, Milton H.; Wessel, H. U.
- Abstract
A ten MHz ultrasonic catheter probe and associated electronics were developed for determination of instantaneous vessel diameter (D). The probe can be stabilized in large vessels and is readily calibrated. Italics evaluation indicated a maximum error in measured D from all sources of less than 5%. In three anesthetized dogs (Wgt: 14.5, 10.4, and 15 kg) instantaneous D and pressure were measured at seven and eight locations in the descending thoracic and abdominal aorta. Angiograms were used to measure D independently. In the upper thoracic aorta D was 13.4, 12.9, and 13.6mm respectively and decreased to 5.80, 2.82, and 6.72mm in the lower abdominal aorta. Mean change of D along the aorta throughout the cardiac cycle was 5.83, 8.44, and 5.34%. The difference between mean diameter measured by ultrasonic and angiographic methods averaged - 5.9, - 8.0, and 4- 0.1 %. The calculated pressure elastic moduli varied between 0.357 and 0.840, 0.193 and 0.932, and 0.332 and 1.18× 106 dyn/ cm2. We conclude that this ultrasonic method can accurately determine the time course of arterial vessel diameter throughout the cardiac cycle. In combination with instantaneous velocity measurements this method permits computation of instantaneous volume flow.
- Publication
Biomedical Engineering / Biomedizinische Technik, 1974, Vol 19, Issue 1, p31
- ISSN
0013-5585
- Publication type
Article
- DOI
10.1515/bmte.1974.19.1.31