PO-0638: Adaptive dose painting by numbers for head and neck cancer: interim analysis of a randomised trial

International audience1. Recherches sur le Fayuan zayuan yuanshi ji de Sengyou (445-518), première anthologie de rites bouddhiques (suite : le contenu des juan 4 et 5) Notre travail de reconstruction du Fayuan zayuan yuanshi ji 法苑雜緣原始集 (Anthologie [pour comprendre] le commencement et l’origine de diverses [pratiques] dans le jardin des devoirs ; ci-après Fayuan) de Sengyou 僧祐 (445-518) nous a amenés cette année à nous pencher sur les 22 premiers titres de la section sur le saṃgha (Sengbao 僧寶, « Le joyau de la Loi ..

Comparative methods for PET image segmentation in pharyngolaryngeal squamous cell carcinoma

Several methods have been proposed for the segmentation of ¹⁸F-FDG uptake in PET. In this study, we assessed the performance of four categories of ¹⁸F-FDG PET image segmentation techniques in pharyngolaryngeal squamous cell carcinoma using clinical studies where the surgical specimen served as the benchmark

The impact of a radiologist-led workshop on MRI target volume delineation for radiotherapy

Introduction: Magnetic resonance imaging (MRI) is increasingly used for target volume delineation in radiotherapy due to its superior soft tissue visualisation compared to computed tomography (CT). The aim of this study was to assess the impact of a radiologist-led workshop on inter-observer variability in volume delineation on MRI. Methods: Data from three separate studies evaluating the impact of MRI in lung, breast and cervix were collated. At pre-workshop evaluation, observers involved in each clinical site were instructed to delineate specified volumes. Radiologists specialising in each cancer site conducted an interactive workshop on interpretation of images and anatomy for each clinical site. At post-workshop evaluation, observers repeated delineation a minimum of 2 weeks after the workshops. Inter-observer variability was evaluated using dice similarity coefficient (DSC) and volume similarity (VOLSIM) index comparing reference and observer volumes. Results: Post-workshop primary gross tumour volumes (GTV) were smaller than pre-workshop volumes for lung with a mean percentage reduction of 10.4%. Breast clinical target volumes (CTV) were similar but seroma volumes were smaller post-workshop on both supine (65% reduction) and prone MRI (73% reduction). Based on DSC scores, improvement in inter-observer variability was seen for the seroma cavity volume on prone MRI with a reduction in DSC score range from 0.4-0.8 to 0.7-0.9. Breast CTV demonstrated good inter-observer variability scores (mean DSC 0.9) for both pre- and post-workshop. Post-workshop observer delineated cervix GTV was smaller than pre-workshop by 26.9%. Conclusion: A radiologist-led workshop did not significantly reduce inter-observer variability in volume delineation for the three clinical sites. However, some improvement was noted in delineation of breast CTV, seroma volumes and cervix GTV

Efektifitas Penggunaan Model Pembelajaran Probing-prompting terhadap Konsentrasi Belajar Peserta Didik SMAN 14 Gowa pada Mata Pelajaran Fisika

Hasil penelitian menunjukkan adanya peningkatan konsentarsi belajar pada peserta didik yang diajar menggunakan model pembelajaran probing-prompting, diperoleh hasil pada penggunaan model pembelajaran probing-prompting sebesar 0,863 (sig > 0,05). Dan adanya peningkatan konsentarsi belajar pada peserta didik yang diajar menggunakan model pembelajaran konvensional yang diterapkan pada peserta didik kelas XI IPA 1, diperoleh hasil pada model pembelajaran konvensional 0,548 (sig > 0,05). Walaupun perbedaanya hanya selisih sedikit pada satu kelas yang dilakukan secara bergantian selama dua pekan. Hasil ini diperoleh dari hasil pengisian kuesioner dan perhitungan menggunakan aplikasi SPSS versi 20 for windows. Hal ini dapat menunjukkan bahwa model pembelajaran probing-prompting efektif untuk diterapkan dalam proses pembelajaran dibandingan dengan model pembelajaran Konvensional dalam hal konsentrasi belajar