tailieunhanh - BASIC AND NEW ASPECTS OF GASTROINTESTINAL ULTRASONOGRAPHY - PART 2

Tham khảo sách 'basic and new aspects of gastrointestinal ultrasonography - part 2', y tế - sức khoẻ, y dược phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 264 Published with permission Ultrasound in Med. Biol. Vol. 28 Nos. 11 12 pp. 1457-1465 2002 Copyright 2002 World Federation for Ultrasound in Medicine Biology Printed in the USA. All rights reserved 0301-5629 02 -see front matter PII S0301-5629 02 00614-2 Original Contribution STRAIN DURING GASTRIC CONTRACTIONS CAN BE MEASURED USING DOPPLER ULTRASONOGRAPHY Odd Helge Gilja Andreas Heimdal Trygve Hausken Hans Gregersen Knut Matre Arnold Berstad and Svein 0DEGAARD Institute of Medicine Haukeland Hospital University of Bergen Bergen Norway fDept. of Informatics University of Oslo Oslo Norway and Department of Surgical Gastroenterology A Aalborg Hospital and Center for Sensory-motor Interaction Aalborg University Aalborg Denmark Received 6 February 2002 in final form 26 July 2002 Abstract This study was undertaken to explore if strain of the muscle layers within the gastric wall could be measured by transabdominal strain rate imaging SRI a novel Doppler ultrasound US method. A total of 9 healthy fasting subjects 8 women 1 man ages 22 to 55 years were studied and both grey-scale and Doppler US data were acquired with a 5- to 8-MHz linear transducer in cineloops of 97 to 256 frames. Rapid stepwise inflation 5 to 60 mL of an intragastric bag was carried out and bag pressure and SRI were measured simultaneously. SRI enabled detailed studies of layers within the gastric wall in all subjects. Great variations in strain distribution of the muscle layers were found. Radial strain was much higher in the circular than in the longitudinal muscle layer. Strains derived from SRI correlated well with strains obtained with B-mode measurements r p . During balloon distension we found an inverse correlation between pressure and radial strain r p . Intraobserver correlation of strain estimation was r p and intraobserver agreement was mean difference 2SD strain . Interobserver correlation was r p and interobserver agreement was .