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A new homogeneity index based on statistical analysis of the dose–volume histogram
Yoon, Myonggeun,Park, Sung Yong,Shin, Dongho,Lee, Se Byeong,Pyo, Hong Ryull,Kim, Dae Yong,Cho, Kwan Ho unknown 2007 Journal of applied clinical medical physics Vol.8 No.2
<P>The goal of the present study was to develop a new dose–volume histogram (DVH)– based homogeneity index for effectively evaluating the dose homogeneity of intensity‐modulated radiotherapy plans. The new index, called the sigma‐index (“<I>S</I>‐index”) is defined as the standard deviation of the normalized differential DVH curve. In a study of 16 patients with brain tumors at our institution, the <I>S</I>‐index was found to vary from 0.80 to 3.15. Our results showed that the <I>S</I>‐index provides a more reliable and accurate measure of dose homogeneity than that given by conventional methods. A guideline for evaluating the dose homogeneity of treatment plans based on the <I>S</I>‐index and its relation to equivalent uniform dose is discussed.</P><P>PACS numbers: 87.53.Xd, 87.53.Tf</P>
Sang Hun Lee,Myung Ho Jeong,Joon Ho Ahn,Dae Young Hyun,Kyung Hoon Cho,Min Chul Kim,Doo Sun Sim,Young Joon Hong,Ju Han Kim,Youngkeun Ahn,Jin Yong Hwang,Weon Kim,Jong Seon Park,Chang-Hwan Yoon,Seung Ho 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.4
Background/Aims: Recurrent acute myocardial infarction (AMI) is an adverse cardiac event in patients with a first AMI. The predictors of recurrent AMI after the first AMI in patients who underwent successful percutaneous coronary intervention (PCI) have not been elucidated. Methods: We analyzed the data collected from 9,869 patients (63.2 ± 12.4 years, men:women = 7,446:2,423) who were enrolled in the Korea Acute Myocardial Infarction Registry-National Institute of Health between November 2011 and October 2015, had suffered their first AMI and had received successful PCI during the index hospitalization. Multivariable logistic regression analysis was performed to identify the independent predictors of recurrent AMI following the first AMI. Results: The cumulative incidence of recurrent AMI after successful PCI was 3.6% (359/9,869). According to the multivariable logistic regression analysis, the significant predictive factors for recurrent AMI were diabetes mellitus, renal dysfunction, atypical chest pain, and multivessel disease. Conclusions: In this Korean prospective cohort study, the independent predictors of recurrent AMI after successful PCI for the first AMI were diabetes mellitus, renal dysfunction, atypical chest pain, and multivessel disease.
Reliability and validity of rasterstereography measurement for spinal alignment in healthy subjects
( Yoon Sil Yi ),( Seul Ki Yoo ),( Da Gam Lee ),( Dae Sung Park ) 물리치료재활과학회 2016 Physical therapy rehabilitation science Vol.5 No.1
Objective: The Back Mapper is one type of Rasterstereography and it can be used in the clinic without radiation exposure. The purpose of our study was to prove the reliability and validity of the Back Mapper and to compare it with the Spinal Mouse, which is an assessment tool for spinal curvatures using a wheeled mouse, and the Cobb angle by X-ray. Design: Cross-sectional study. Methods: Twenty healthy adults participated in the test to investigate for the inter-rater reliability, intra-rater reliability, and concurrent validity. The tests were performed with assessment devices for scoliosis such as the Back Mapper, Spinal Mouse and Cobb`s angle. Data was analyzed by an intraclass correlation coefficient (ICC) value and a standard error of measurement for reliability and correlation analysis for validity. Results: Intra-rater reliability of the Back Mapper was good (Cronbach`s α=0.821-0.984, ICC=0.696-0.969) except for assessing the lordotic angle. Inter-rater reliability was good (Cronbach`s α=0.870-0.958, ICC=0.770-0.919) in assessment for trunk imbalance, rotation of scapulae, thoracic angle, lumbar angle, and kyphotic angle. The kyphotic angle in the Spinal Mouse had a significant correlation icompared with the Back Mapper (r=0.510, p<0.05), and the Cobb`s angle from an X-ray had a significant correlation with trunk inclination (r=0.532, p<0.05). Conclusions: These findings provide good intra-reliability of the Back Mapper in healthy subjects, but the Back Mapper requires more experienced practice to have good inter-reliability. Also, the variables of the Back Mapper does not seem as appropriate compared with the Cobb angle by X-ray.
( Sang Hoon Kim ),( Edward Alain B. Pajarillo ),( Marilen P. Balolong ),( Ji Yoon Lee ),( Dae Kyung Kang ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.6
In this study, the global proteome of the IPEC-J2 cell line was evaluated using ultra-high performance liquid chromatography coupled to a quadrupole Q Exactive™ Orbitrap mass spectrometer. Proteins were isolated from highly confluent IPEC-J2 cells in biological replicates and analyzed by label-free mass spectrometry prior to matching against a porcine genomic dataset. The results identified 1,517 proteins, accounting for 7.35% of all genes in the porcine genome. The highly abundant proteins detected, such as actin, annexin A2, and AHNAK nucleoprotein, are involved in structural integrity, signaling mechanisms, and cellular homeostasis. The high abundance of heat shock proteins indicated their significance in cellular defenses, barrier function, and gut homeostasis. Pathway analysis and annotation using the Kyoto Encyclopedia of Genes and Genomes database resulted in a putative protein network map of the regulation of immunological responses and structural integrity in the cell line. The comprehensive proteome analysis of IPEC-J2 cells provides fundamental insights into overall protein expression and pathway dynamics that might be useful in cell adhesion studies and immunological applications.
( Sang Pyo Lee ),( Kang Nyeong Lee ),( Oh Young Lee ),( Hang Lak Lee ),( Dae Won Jun† ),( Byung Chul Yoon ),( Ho Soon Choi ),( Se Jin Hwang ),( Seo Eun Lee ) The Editorial Office of Gut and Liver 2014 Gut and Liver Vol.8 No.2
Background/Aims: DA-9701, a standardized extract of Pharbitis Semen and Corydalis Tuber, is a new prokinetic agent that exhibits an analgesic effect on the abdomen. We investigated whether DA-9701 affects visceral pain induced by colorectal distension (CRD) in rats. Methods: A total of 21 rats were divided into three groups: group A (no CRD+no drug), group B (CRD+no drug), and group C (CRD+DA-9701). Expression of pain-related factors, substance P (SP), c-fos, and phosphorylated extracellular signal-regulated kinase (p-ERK) in the dorsal root ganglion (DRG) and spinal cord was determined by immunohistochemical staining and Western blotting. Results: The proportions of neurons in the DRG and spinal cord expressing SP, c-fos, and p-ERK were higher in group B than in group A. In the group C, the proportion of neurons in the DRG and spinal cord expressing p-ERK was lower than that in group B. Western blot results for p-ERK in the spinal cord indicated a higher level of expression in group B than in group A and a lower level of expression in group C than in group B. Conclusions: DA-9701 may decrease vis-ceral pain via the downregulation of p-ERK in the DRG and spinal cord. (Gut Liver 2014;8:140-147)
( Sang Hoon Park ),( Hoon Jai Chun ),( Yong Dae Kwon ),( Bo Ra Keum ),( Yeon Seok Seo ),( Yong Sik Kim ),( Yoon Tae Jeen ),( Soon Ho Um ),( Chang Duck Kim ),( Ho Sang Ryu ),( Ji Hye Lee ),( Yang Seok 대한소화기학회 2008 Gut and Liver Vol.2 No.3
Background/Aims: Endoscopic mucosal resection can cure early gastric cancer. The risk of lymphatic metastasis is related to the depth of submucosal invasion by the mucosal malignancy, with a resection depth of 500 μm generally accepted as a safe cut-off. However, excessive thinning induced by stretching of the resected tissue sometimes preventing a precise diagnosis. We studied the effects of stretching on different layers and sites of gastric tissue. Methods: Porcine stomachs were cut into 2.0×2.0 cm pieces, and pieces from body were stretched to 2.5, 3.0, and 3.5 cm. Pieces from the cardia, body, and antrum were also stretched to 3.0 cm. The thickness of each layer was measured and analyzed statistically. Results: Whole gastric wall and submucosal layers showed gradual thinning, with stretching to 3.5 cm tearing the tissues and resulting in imperfect extension. The submucosa was thinner in body tissue than in cardia and antrum tissues. Stretching to 3.0 cm induced a consistent decrease in submucosal thickness (30-70%). The change in thickness varied widely between individual samples. Conclusions: A resection margin of 500μm might be insufficient for the complete removal of malignancy. Moreover, the thickness of the submucosal layer differs with the gastric site and between individuals. Future studies are needed to confirm the findings in human tissue. (Gut and Liver 2008;2:199-204)