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    Hepatobiliary and Pancreatic: Magnetic resonance imaging (MRI) features of liver involvement in adult-onset Still's disease
    (WILEY-BLACKWELL, 2015) Koplay, M.; Sivri, M.; Kendir, I. C.; Erdogan, H.; Yilmaz, S.
    [Abstract not Available]
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    INTERACTION MATRIX APPLICATION AT ERMENEK (KARAMAN) LIGNITE MINE
    (INT SCIENTIFIC CONFERENCE SGEM, 2008) Gokay, M. K.; Erdogan, H.; Dogan, K.
    This study includes the application of interaction matrix system given by Hudson in 1992 to underground coal mining conditions. Implication of interaction matrix was realized here at private company owned underground coal mine. After clear description of the interaction matrix and its properties, selected mine workers and engineers worked at the studied underground mine were asked to evaluate predefined 21 evaluation parameters. During the evaluation of the matrix, the parameters were evaluated to obtain critical and dominant factors to rise the mine's operation efficiency. The interaction matrix form obtained from each person in this work were analyzed accordingly and saved for further inspections. These matrixes demonstrated which parameter was important and which one was dominant according to the person who evaluated the matrix.
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    Mount Fuji sign following surgical drainage of spinal epidural abscess
    (OXFORD UNIV PRESS, 2015) Gokmen, I. E.; Keskin, S.; Kiresi, D.; Erdogan, H.
    [Abstract not Available]
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    Prospective ECG-gated high-pitch dual-source cardiac CT angiography in the diagnosis of congenital cardiovascular abnormalities: Radiation dose and diagnostic efficacy in a pediatric population
    (ELSEVIER MASSON, CORP OFF, 2016) Koplay, M.; Kizilca, O.; Cimen, D.; Sivri, M.; Erdogan, H.; Guvenc, O.; Oc, M.
    Purpose: The goal of this study was to investigate the radiation dose and diagnostic efficacy of cardiac computed tomography angiography (CCTA) using prospective ECG-gated high-pitch dual-source computed tomography (DSCT) in the diagnosis of congenital cardiovascular abnormalities in pediatric population. Materials and methods: One hundred five pediatric patients who were clinically diagnosed with congenital heart disease with suspected extracardiac vascular abnormalities were included in the study. All CCTAs were performed on a 128 x 2-section DSCT scanner. CCTA findings were compared with surgical and/or conventional cardiac angiography findings. Dose-length product (DLP) and effective doses (ED) were calculated for each patient. Patients were divided into 4 groups by age, and ED and DLP values were compared among groups. The image quality was evaluated using a five-point scale. Results: CCTA showed 173 abnormalities in 105 patients. There were 2 patients with false positive and 3 with false negative findings. The sensitivity and specificity of CCTA were 98.3% and 99.9%, respectively. The positive predictive value and negative predictive value of CCT were 98.9% and 99.9%, respectively. The average DLP and ED values were 15.6 +/- 9.6 (SD) mGy.cm and 0.34 +/- 0.10 (SD) mSv, respectively. The mean image quality score was 4.8 +/- 0.5 (SD) in all patients. The inter-observer agreement for the image quality scores was good (kappa = 0.80). Conclusion: CCTA is an excellent imaging modality for evaluation of cardiovascular abnormalities and provides excellent image quality with very low radiation exposure when low-dose prospective ECG-triggered high-pitch DSCT is used. (C) 2016 Editions francaises de radiologie. Published by Elsevier Masson SAS. All rights reserved.
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    Radiation dose and diagnostic accuracy of high-pitch dual-source coronary angiography in the evaluation of coronary artery stenoses
    (ELSEVIER MASSON, CORPORATION OFFICE, 2016) Koplay, M.; Erdogan, H.; Avci, A.; Sivri, M.; Demir, K.; Guler, I.; Demir, L. S.
    Purpose: "Flash Spiral'' imaging is a new prospective ECG-triggered spiral scan mode that uses a very high-pitch for coronary computed tomography angiography (CTA). This enables complete image acquisition within one cardiac cycle with a very low radiation exposure. The aim of this study was to investigate the diagnostic accuracy, image quality, and effective radiation dose of prospectively ECG-triggered high-pitch spiral method (Flash spiral mode) of coronary CTA using dual-source technology for the evaluation of coronary artery stenoses. Material and methods: The study included 186 consecutive patients (115 men, 71 women; mean age: 53.37 years) who underwent coronary CTA. Coronary CTA was performed with a 128 x 2-slice dual-source CT (Somatom Definition Flash, Siemens, Germany) using a prospectively ECG-triggered high-pitch spiral mode. Patients were divided into three groups according to heart rate (<= 65 bpm, 66-75 bpm, >= 76 bpm) and body mass index (BMI) (20-24 kg/m(2), 25-29 kg/m(2), 30-34 kg/m(2)) values. The correlation between heart rates, image quality and BMI values are investigated. A four-point scale (1 = excellent, 4 = poor/non-diagnostic) was used to rank the comparative image quality. Effective radiation doses were calculated. Also the correlation between radiation dose, sex and BMI values were investigated. In addition, diagnostic accuracy of CTA for detection of significant (= 50%) coronary artery stenoses was compared with invasive coronary angiography findings of 612 vessel segments in 38 patients. The sensitivity, specificity, positive predictive value, negative predictive value and diagnostic accuracy rate were calculated. Results: A total of 2976 coronary artery segments were present. Of all coronary artery segments, 2381 (80%) had an image quality score of 1, and 1.5% segments were rated as "poor/nondiagnostic". When the correlation between heart rate and image quality is investigated, there was a significant difference between < 65 bpm and > 76 bpm groups. However, there was no significant difference between < 65 bpm and 66-75 bpm groups. The mean effective dose was found as 1.3 mSv (min: 0.5, max: 2.4 mSv). The correlation between effective radiation dose and BMI was moderate. However, the correlation between gender and radiation dose was significant. Sensitivity, specificity, negative predictive value and accuracy of coronary CTA on a per -vessel segment were 90.1%, 97.4%, 98.6%, and 96.5%, respectively. Conclusions: Prospectively ECG -triggered high -pitch spiral mode coronary CTA provides high image quality and diagnostic accuracy, with very low radiation dose for evaluation and exclusion of coronary artery stenoses. (C) 2015 Editions franc aises de radiologie. Published by Elsevier Masson SAS. All rights reserved.