Ultrasound characterization of XXXX by quantitative texture analysis.

@entity235 @entity741 @entity63
In this study we tested the efficacy of quantitative texture analysis in the identification of @entity741 using an ultrasound data acquisition system that digitizes and stores echocardiographic data in polar format. In nine closed-chest @entity235 , data were acquired before and after coronary occlusion using a 2.4 MHz echocardiographic system. Regions of interest were analyzed at end-diastole and end-systole from the @entity63 area and normal area at the same depth of field. Ultrasound data were evaluated using previously reported quantitative gray level texture measures. After occlusion, texture changes indicative of @entity63 were found in systolic images. The directional component of the data analysis was important; analysis in the azimuthal direction was more accurate than in the axial direction. Six texture measures exhibited significant changes in the @entity63 region from control to occlusion when analyzing data in the azimuthal direction. One false positive result occurred (significant texture change in the normal region from control to occlusion) in the azimuthal direction. Several false positive alterations in the normal regions from control to occlusion were found when the texture was evaluated in the axial direction. For accurate assessment of @entity63 changes, preocclusion image data were required. We conclude that quantitative echocardiographic texture analysis using polar format data can identify subtle changes in myocardial texture such as that due to @entity63 , using data acquired through the chest wall.
