Vulnerabilities of radiomic features to respiratory motion on four‐dimensional computed tomography‐based average intensity projection images: A phantom study

[Purpose] To evaluate the influence of respiratory motion on the robustness of radiomic features on four-dimensional computed tomography (4DCT)-based average intensity projection (AIP) images by employing an anthropomorphic chest phantom. [Methods] Three spherical objects (φ30 mm), namely, acrylic (100 Hounsfield unit [HU], homogeneous), rubber (−140 HU, homogeneous), and cork (−630 HU, heterogeneous), were moved with motion amplitudes of 0, 1, 2.5, 4, 6, 8, and 10 mm in the phantom, and 4DCT scans were repeated at four different locations. Thereafter, the AIP images were generated considering the average of the 10 respiratory phases of the 4DCT images. Further, the targets were manually delineated on the AIP images in the lung window setting. A total of 851 radiomic features, including 107 unfiltered features and 744 wavelet filter-based features, were extracted from the region of interest for each material. The feature robustness among the different target motion amplitude (ε) was evaluated by normalizing the feature variability of the target motion relative to the variability of data from 573 patients with early-stage non-small cell lung cancer. The features with absolute ε values ≤0.5 were considered highly robust to target motions. [Results] The percentage of robust unfiltered and wavelet filter-based features with a motion amplitude of 1 mm was greater than 83.2% and 93.4%, respectively; however, the percentage decreased by more than 24.3% and 17.6%, respectively, for motion amplitudes greater than 2.5 mm. The movement of cork had a small effect on the feature robustness compared to that of acrylic and rubber, regardless of the target motion amplitudes. [Conclusions] Our phantom study demonstrated that target motion amplitudes ≤1 mm led to the robustness of radiomic features on the 4DCT-based AIP images of thoracic regions. The frequency components and directions of the wavelet filters may be essential factors in 4DCT-based radiomic analysis

セイトシドウ ニ オケ ル ケンリョク : フーコー ノ ケンリョクロン ヲ テガカリ ニ

Power which makes subject direct a certain way works on student guidance. In this article, the relation between Power and student guidance is examined based on Foucault\u27s theories of Power. Then problems of student guidance from view of Power are clarified

タブンカキョウイク ヲ カンガエル シザ ドウカ ト ハイジョ ヲ コエテ

The purpose in this article is considering the perspectives for multicultural education.While the importance of multicaltural education has been becoming more and more, the problem of multicultural education has been indicated , in these days.In this article, I will survey some types of studies on multicultural education. The types ofstudies on multicultural education include 3 types of theoretical studies and 2 types of practical studies

ハッタツ ニオケル キョウドウセイ ヴィゴツキー ト トマセロ オ テガカリ ニ

I believe that human infants are cooperaitonal originally, so development and learning occur in cooperation. However there is a certain view which considers development and learning as individualistic, independent, and self-sufficiently process. Such views consider cooperative learning as one of teaching methods, and deprive learning of cooperationality. It is L.S.Vygotsky and M.Tomasello who emphasis cruciality of cooperationality in development and learning. They found unique characteristics of human development in cooperationality

The ontological dimension of human development in Vygotsky\u27s developmental theory

The purpose of this article is to reform the view of Vygotsky. In the reinterpretations of Vygotsky\u27s developmental theory, his theories about the development in ontological dimension have been overlooked and Vygotsky has been viewed as cognitive psychologist. How did Vygotsky treat the development in ontological dimension? What meanings does Vygotsky\u27s theory about the development in ontological dimension suggest? This article describes how Vygotsky treated the development in ontological dimension by examining Vygotsky\u27s studies on defectology. And I find the unfinished project of Vygotsky as a Marxist in his defectology

キョウドウ テキ ナ マナビ ニ オケル 「 サイキンセツ ハッタツ リョウイキ 」

ヴィゴツキーの中心的な概念である「最近接発達領域」は、その解釈を巡って様々な議論を生じさせてきた。この概念は、発達における協同性とそこでの学びと発達との関係を意味する概念であるが、その具体的な内実に関しては明らかになっていない。本稿では、小学校5年生の算数科の授業における協同的な学びの場面に焦点をあて、「最近接発達領域」を協同的な学びとの関係で考えていく。It is a central concept of Vygotsky "zone of proximal development ", has caused a variety of discussion over the interpretation. This concept reoresents the relationship between development and learning at the bottom and cooperativity in the development; the details remain insufficiently clarified. In this paper, we focus on cooperative learning scene in the class of elementary school fifth grade mathematics, and we consider the relationship with the cooperative learning the "zone of proximal development "

タブンカ キヨウイク ヲ カンガエル シザ2

The purpose on this article is to reveal the frames which are "rhetorical frame" and "activity frame" of practicioners who are engaged in the project about multicultural nursery. The project consists of nursery teachers in Mie prefecture. I also am engaged in the project as a coordinator. Any transformations of two frames and any relation between two frames are revealed on this article

(−)545-fac-Δ-Tris(l-prolinato)cobalt(III) trihydrate

The absolute configuration of the octa­hedral fac-CoN3O3 title complex, [Co(C5H8NO2)3]·3H2O, has been determined by single-crystal X-ray analysis. A three-dimensional network of hydrogen bonds is observed between the proline carboxyl­ate groups and the three uncoordinated water mol­ecules