摘要:

Multiresolutional texture analysis techniques using wavelet transforms have been used for predicting percentage intramuscular fat (IMFAT) of beef ribeye muscle. Ultrasound B-mode images have been collected from 207 live beef animals and digitized through frame grabber connected to a personal computer. Since fat has acoustic properties that are appreciably different from that of muscle, transmitted ultrasound is reflected from the interface between fat and muscle. As fat deposits increase, the speckle content of ultrasound B-mode images also increases. Since the speckle alters the texture of the image, IMFAT can be estimated using texture analysis methods. The Haar wavelet was used as a basis function for generating the fast wavelet transform and several features were calculated from the 2-D wavelet decomposed ultrasound images. Significant features included energy ratios, second and fourth order central moments. Correlation coefficients of the features with the actual IMFAT were calculated to select features for predicting IMFAT. Linear regression (LR) models were used as a tool for predicting IMFAT from the selected features.

ISSN:1058-9759    

DOI:10.1080/10589759808953051

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Diagnostic ultrasonic characterization of the heart is designed to assess the state of the myocardium with ultrasonic parameters that relate to structural or functional components of cardiac muscle. The potential cross fertilization of ideas and methods between those borne out of research in quantitative nondestructive evaluation of materials and those borne out of research in diagnostic medical applications in the area of ultrasonics represents an attractive goal. In this paper we describe our approach to tissue characterization of the heart based on quantitative ultrasonic imaging. We discuss methods of ultrasonic tissue characterization applied in laboratory and clinical investigations. Specific examples of the application of clinical quantitative tissue characterization include measurements of the hearts of patients with remote myocardial infarction, dilated cardiomyopathy, acute myocardial ischemia, and hearts of patients with diabetes. The role of anisotropy in quantitative tissue characterization and its effect on measurements obtained from specific standard echocardiographic views are reviewed.

ISSN:1058-9759    

DOI:10.1080/10589759808953052

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

In this paper we will present initial results from an ongoing project at the University of Missouri-Columbia which focuses on prostate cancer detection using transrectal ultrasound. The overall project goal is the development of effective procedures for the detection, grading, and staging of prostate cancer. The goal of this initial study was lo ascertain whether acoustic parameters used in classical ultrasonic nondestructive evaluation (NDE) of engineering materials may be useful in identifying prostate cancer. The classical parameters speed of sound and attenuation coefficient were used along with a relatively new parameter in ultrasonic NDE, backscatter coefficient. The study was performed in vitro using human prostates which were obtained from radical prostatectomies. Each prostate was transversely sectioned to extract a 2 mm slice which was then scanned in an ultrasonic NDE research laboratory. Cancerous and benign regions of the prostate were subsequently identified on the tissue slice by a pathologist. This scanning and analysis procedure allowed for a one-to-one correlation of actual tissue histopathology and acoustic parameter images. Quantitative data for both tissue types were extracted by using the combination of histopathology images and acouslic parameter images. Results are presented which compare acoustic parameter distributions for cancerous versus benign tissue based on speed of sound, attenuation coefficient, and back-scatter coefficient. The data corroborate the previous in vim result that the acoustic response of cancerous tissue is, on the average, indistinguishable from the acoustic

ISSN:1058-9759    

DOI:10.1080/10589759808953053

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:1058-9759    

DOI:10.1080/10589759808953054

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor