Ultrasonic Imaging of Material Condition Using Advanced Simplified Ultrasonic CT

2002 ◽  
pp. 337-344
Author(s):  
Kyung Cho Kim ◽  
Hiroaki Fukuhara ◽  
Hisashi Yamawaki
Keyword(s):  
Ultrasonic Imaging ◽  
Material Condition ◽  
Ultrasonic Ct

ULTRASONIC IMAGING OF MATERIAL CONDITION USING ADVANCED SIMPLIFIED ULTRASONIC CT

2003 ◽  
Vol 26 (4) ◽  
pp. 403-411
Author(s):  
Kyung Cho Kim ◽  
Hiroaki Fukuhara ◽  
Hisashi Yamawaki
Keyword(s):  
Frequency Analysis ◽  
Measurement Method ◽  
Welded Joint ◽  
Base Material ◽  
Response Property ◽  
Ct Image ◽  
Analysis Method ◽  
Material Condition ◽  
Ct System ◽  
Ultrasonic Ct

In this research, a new measurement method to estimate on infinitesimal change in material condition, the simplified ultrasonic CT system, which uses the information of three directions, that is, 90°, +45° and -45° to the inspection plane is proposed. The use of a simplified ultrasonic CT system has two merits: firstly, the measurement time is very short compared to a general CT; secondly, it can detect sensitively very infinitesimal defects in vertical or slant directions about the inspection plane because the obtained image is not a C scan image but a CT image calculated from three directions. Because of these merits, this method can be considered very effective for the evaluation of material condition. In order to know the applicability of actual NDT, several kinds of welded specimens were investigated. The results showed that the CT images obtained were very similar to the actual defect of specimens. Also, in order to confirm the performance of simplified ultrasonic CT, the D scan image by the TOFD method was obtained for the same specimen. The C scan or CT image gave better information than the D scan image obtained from TOFD method. In this research, the frequency analysis method for enhancing the C scan or CT image is developed. This frequency analysis method is based on the frequency response property of the material. By comparing the magnitude at frequency domain, the special frequency which shows the greatest difference between welded joint and base material was searched for and used to get a C scan or CT image.

Improved Ultrasonic Imaging of the Breast

2004 ◽  
Author(s):  
William F. Walker
Keyword(s):  
Ultrasonic Imaging

Ultrasonic Block Compressed Sensing Imaging Reconstruction Algorithm Based on Wavelet Sparse Representation

2020 ◽  
Vol 16 (3) ◽  
pp. 262-272
Author(s):  
Guangzhi Dai ◽  
Zhiyong He ◽  
Hongwei Sun
Keyword(s):  
Compressed Sensing ◽  
Sparse Representation ◽  
Linear Array ◽  
Imaging System ◽  
Ultrasonic Imaging ◽  
Large Data ◽  
Reconstruction Algorithm ◽  
Array Transducer ◽  
Total Data ◽  
Block Compressed Sensing

Background: This study is carried out targeting the problem of slow response time and performance degradation of imaging system caused by large data of medical ultrasonic imaging. In view of the advantages of CS, it is applied to medical ultrasonic imaging to solve the above problems. Objective: Under the condition of satisfying the speed of ultrasound imaging, the quality of imaging can be further improved to provide the basis for accurate medical diagnosis. Methods: According to CS theory and the characteristics of the array ultrasonic imaging system, block compressed sensing ultrasonic imaging algorithm is proposed based on wavelet sparse representation. Results: Three kinds of observation matrices have been designed on the basis of the proposed algorithm, which can be selected to reduce the number of the linear array channels and the complexity of the ultrasonic imaging system to some extent. Conclusion: The corresponding simulation program is designed, and the result shows that this algorithm can greatly reduce the total data amount required by imaging and the number of data channels required for linear array transducer to receive data. The imaging effect has been greatly improved compared with that of the spatial frequency domain sparse algorithm.

Kant’s Material Condition of Real Possibility

2017 ◽  
Author(s):  
Jessica Leech
Keyword(s):  
Pure Reason ◽  
Critique Of Pure Reason ◽  
Real Possibility ◽  
Rational Theology ◽  
Material Condition

In the Postulates of Empirical Thinking, a section of the Critique of Pure Reason, Kant presents an account of the content and role of our concept of real possibility in terms of formal conditions of experience. However, much later in the Critique he introduces the idea of a material condition of possibility. What is this material condition of possibility, and how does it fit with the conception of possibility in terms of formal conditions? This essay argues that the key to answering these questions—as well as to understanding Kant’s criticism of rational theology, in which the discussion of the material condition of possibility appears—is Kant’s account of how we can individuate objects.

Formal Independence

2018 ◽  
Author(s):  
Michelle Kosch
Keyword(s):  
Moral Evil ◽  
Moral Worth ◽  
Material Condition

Chapter 4 explains Fichte’s conception of formal independence or conscientiousness, which has two aspects (a ‘formal’ and a ‘material’ aspect, the latter not to be confused with material independence). Fichte’s account is compared with Kant’s, and the two are shown to be in more agreement than has previously been thought. The independence of the material condition on moral worth from this formal one is shown to be entailed by Fichte’s account of the role of conscience (rather than, as is often thought, being inconsistent with it). Finally, Fichte’s account of moral evil is explained and its consistency with his account of conscience examined.

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