Automated classification of pulmonary nodules through a retrospective analysis of conventional CT and two-phase PET images in patients undergoing biopsy

Objective(s): Positron emission tomography/computed tomography (PET/CT) examination is commonly used for the evaluation of pulmonary nodules since it provides both anatomical and functional information. However, given the dependence of this evaluation on physician’s subjective judgment, the results could be variable. The purpose of this study was to develop an automated scheme for the classification of pulmonary nodules using early and delayed phase PET/ CT and conventional CT images.Methods: We analysed 36 early and delayed phase PET/CT images in patients who underwent both PET/CT scan and lung biopsy, following bronchoscopy. In addition, conventional CT images at maximal inspiration were analysed. The images consisted of 18 malignant and 18 benign nodules. For the classification scheme, 25 types of shape and functional features were first calculated from the images. The random forest algorithm, which is a machine learning technique, was used for classification.Results: The evaluation of the characteristic features and classification accuracy was accomplished using collected images. There was a significant difference between the characteristic features of benign and malignant nodules with regard to standardised uptake value and texture. In terms of classification performance, 94.4% of the malignant nodules were identified correctly assuming that 72.2% of the benign nodules were diagnosed accurately. The accuracy rate of benign nodule detection by means of CT plus two-phase PET images was 44.4% and 11.1% higher than those obtained by CT images alone and CT plus early phase PET images, respectively.Conclusion: Based on the findings, the proposed method may be useful to improve the accuracy of malignancy analysis

Analysis of KIT, SCF, and Initial Screening of SLUG in Patients with Piebaldism

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美しい歩き方に関する研究―歩き方と文化―

Since Edo era, walking style of Japanese people has been significantly changed along with cultural transitions. This article compiles a research on features of Japanese traditional walking style,such as"Nanba"and"Suriashi", then discusses issues of today\u27s walking style

美しい歩き方に関する研究―加速度計による評価法―

This paper presents the measurement of the walking that uses the potable acceleration device and the estimation method of walking. By measuring the walking which uses the potable accelerometer device,the walking action was able to be grasped. In addition, the measured data of the walking made the walking evaluation on progressing direction, the deflection of the body in right and left, up and down movement possible

美しい歩き方に関する研究―高齢者の健康への取り組み―

This study tried to develop a method of analyzing a style of walking. As a result, it was found that the analysis could be made using data collected by an accelerometer. We also propose a style of walking which is suitable for the elderly in this paper