Person: KOCAKOÇ, ERCAN
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- PublicationMetadata onlyDiagnosis of Peritoneal Metastases with Abdominal Malignancies: Role of ADC Measurement on Diffusion Weighted MRI(2012-12-01T00:00:00Z) ONUR, MEHMET RUHİ; Akyol, Muammer; POYRAZ, AHMET KÜRŞAD; KOCAKOÇ, ERCAN; Ogur, Erkin; KOCAKOÇ, ERCANObjective: The purpose of our study was to evaluate the utility of the apparent diffusion coefficient (ADC) value measurement in the diagnosis of peritoneal metastases on diffusion weighted magnetic resonance imaging.
- PublicationMetadata onlyEvaluation of left renal vein entrapment using multidetector computed tomography(2013-03-01T00:00:00Z) POYRAZ, AHMET KÜRŞAD; FIRDOLAŞ, FATİH; ONUR, MEHMET RUHİ; KOCAKOÇ, ERCAN; KOCAKOÇ, ERCANBackground: Nutcracker syndrome, also called left renal vein entrapment syndrome, is a cause of non-glomerular hematuria with difficulties in diagnosis. Multidetector computed tomography (MDCT) is a powerful tool to prevent unnecessary diagnostic procedures.
- PublicationMetadata onlyDiffusion-weighted MRI of fatty liver(2012-05-01T00:00:00Z) POYRAZ, AHMET KÜRŞAD; ONUR, MEHMET RUHİ; KOCAKOÇ, ERCAN; Ogur, Erkin; KOCAKOÇ, ERCANPurpose: To investigate the effect of fat infiltration on the apparent diffusion coefficient (ADC) of liver, and assess the relationship between ADC and hepatic fat fraction (HFF). Materials and Methods: MRI scans of 120 consecutive patients were included in this retrospective study. Of these, 42 patients were included in the fatty liver group and 78 in the control group. ADC values were measured from a pair of diffusion-weighted (DW) images (b 0 mm(2)/s and 1000 mm(2)/s). HFFs were measured using T1W GRE dual-echo images. The difference between the ADCs of the two groups was assessed with the t-test. The relationship between HFF and ADC was determined using linear regression analysis and the Pearson correlation coefficient (r). Results: Mean HFFs were 0.85 +/- 2.86 and 13.67 +/- 8.62 in the control and fatty liver groups, respectively. The mean ADC of fatty liver group 1.20 +/- 0.22 x 10 (-3) mm (2)/s was significantly lower than that of the control group 1.32 6 0.23 x 10(-3) mm (2)/s (P = 0.02). Linear regression analysis revealed an inverse relationship between ADC and HFF (r = 0.39, P 5% HFF, and ADC and HFF exhibit an inverse relationship. Key Words: MRI; diffusion-weighted; fatty liver; imaging; chemical shift J. Magn. Reson. Imaging 2012; 35: 1108-1111. (C) 2011 Wiley Periodicals, Inc.
- PublicationMetadata onlyThe role of apparent diffusion coefficient values in differentiation between adrenal masses(2014-03-01T00:00:00Z) Cicekci, Mehtap; ONUR, MEHMET RUHİ; Aydin, Ayse Murat; Gul, Yeliz; ÖZKAN, YUSUF; AKPOLAT, NUSRET; KOCAKOÇ, ERCAN; KOCAKOÇ, ERCANThe aim of this study was to evaluate the utility of apparent diffusion coefficient (ADC) values in differentiation between solid adrenal masses. The ADC values of 73 adrenal lesions (54 benign, 19 malignant) in 69 patients were measured at b 100, 600 and 1000 gradients on diffusion-weighted magnetic resonance imaging (DW-MRI). No statistically significant difference was found between ADC values of benign and malignant adrenal masses, nonadenomatous benign adrenal masses and malignant adrenal masses, adrenal adenomas and nonadenomatous lesions, adenomas and metastases, adenomas and pheochromocytomas, metastases and pheochromocytomas. ADC values are not helpful in the differentiation between solid adrenal masses. (C) 2014 Elsevier Inc. All rights reserved.
- PublicationMetadata onlyThe role of ADC measurement in differential diagnosis of focal hepatic lesions(2012-03-01T00:00:00Z) ONUR, MEHMET RUHİ; Cicekci, Mehtap; Kayali, Alperen; POYRAZ, AHMET KÜRŞAD; KOCAKOÇ, ERCAN; KOCAKOÇ, ERCANPurpose: To evaluate the utility of apparent diffusion coefficient (ADC) measurement in characterization of focal solid hepatic lesions and determine the role of ADC values in differentiation of solid benign and solid malignant hepatic lesions.
- PublicationMetadata onlyUtility of ADC measurement on diffusion-weighted MRI in differentiation of prostate cancer, normal prostate and prostatitis(2013-08-01T00:00:00Z) Esen, Meltem; ONUR, MEHMET RUHİ; AKPOLAT, NUSRET; ORHAN, İRFAN; KOCAKOÇ, ERCAN; KOCAKOÇ, ERCANTo determine the utility of apparent diffusion coefficient (ADC) values in differentiation of prostate cancer from normal prostate parenchyma and prostatitis we obtained ADC values of 50 patients at b 100, 600 and 1,000 s/mm(2) diffusion gradients. The ADC values of prostate cancer group were significantly lower than normal prostate and prostatitis group at b 600 and 1,000 s/mm(2) gradients. The ADC values at high diffusion gradients may be used in differentiation prostate cancer from normal prostate and prostatitis.
- PublicationMetadata onlyEvaluation of normal appendix vermiformis in adults with multidetector computed tomography(2012-11-01T00:00:00Z) Turkoglu, Huseyin; ONUR, MEHMET RUHİ; POYRAZ, AHMET KÜRŞAD; KOCAKOÇ, ERCAN; KOCAKOÇ, ERCANTo determine the utility of different contrast enhancement phases (unenhanced, arterial, and venous), slice thicknesses (0.5, 3, and 5 mm), and planes (axial and coronal) in the evaluation of appendix vermiformis (AV) on multidetector computed tomography (MDCT), CT examinations of 600 patients were obtained. No significant difference was found between the different imaging planes, slice thicknesses, and contrast enhancement phases in terms of detection rates of AV. The mean diameter of AV in the axial plane (5.93 +/- 0.06 mm) was significantly lower than that in the coronal plane (6.18 +/- 0.06 mm). Evaluation of AV on MDCT is enhanced by combined interpretation on axial and coronal planes. (C) 2012 Elsevier Inc. All rights reserved.
- PublicationMetadata onlyRole of Diffusion MRI and Apparent Diffusion Coefficient Measurement in the Diagnosis, Staging and Pathological Classification of Bladder Tumors(2011-01-01T00:00:00Z) Daggulli, Mansur; ONUR, MEHMET RUHİ; FIRDOLAŞ, FATİH; Onur, Rahmi; KOCAKOÇ, ERCAN; ORHAN, İRFAN; KOCAKOÇ, ERCANObjectives: Our aim was to investigate the role of simultaneous apparent diffusion coefficient (ADC) measurement and diffusion-weighted MRI (DWMRI) in the diagnosis and differentiation of bladder masses. Methods: We examined 45 patients presenting with hematuria by dynamic and diffusion MRI (at b100, b600, b1000 gradients) and cystoscopy. Thirty healthy volunteers without hematuria were also included in the study. Results from imaging techniques were compared to cystoscopic and histopathologic findings. The ADC values of benign and malignant bladder masses, and bladder tissue in healthy subjects were measured and compared with each other. Results: The mean ADC values of benign (n = 10) and malignant lesions (n = 35) were significantly lower than the mean ADC values of adjacent bladder walls and bladder walls of healthy subjects at all 3 gradients (p 0.05). Mean ADC values of invasive tumors were significantly lower than superficial malignancies at b600 and b1000 gradients. The mean ADC values of transitional cell tumors were significantly higher than squamous cell tumors at b100 and b600 gradients. Conclusion: Simultaneous measurement of ADC and DWMRI provided useful information in the diagnosis, staging and histopathological classification of bladder tumors. Copyright (C) 2011 S. Karger AG, Basel
- PublicationMetadata onlyRole of the apparent diffusion coefficient measurement by diffusion weighted magnetic resonance imaging in the diagnosis of Fasciola hepatica in the liver(2011-12-01T00:00:00Z) ONUR, MEHMET RUHİ; Cicekci, Mehtap; Kayali, Alperen; KOCAKOÇ, ERCAN; Aygun, Cem; KOCAKOÇ, ERCANPurpose. The aim of this study was to investigate the diagnostic role of the apparent diffusion coefficient (ADC) measurement in the diagnosis of focal parenchymal lesions and to understand the discriminating role of the ADC value for differentiating Fasciola lesions from other focal liver lesions.
- PublicationMetadata onlyCystic abdominal masses in children: a pictorial essay(2013-01-01T00:00:00Z) ONUR, MEHMET RUHİ; BAKAL, ÜNAL; KOCAKOÇ, ERCAN; TARTAR, TUGAY; KAZEZ, AHMET; KOCAKOÇ, ERCANCystic abdominal masses in children are not an infrequently encountered condition of childhood. These lesions usually present with large size and mimick each other with similar presenting symptoms. Imaging examinations have an important role to determine the type of the cystic abdominal masses, which is crucial for management of patients and presurgical planning. In this pictorial essay, we summarized the imaging features of common cystic abdominal masses of children, including cystic lesions arising from liver, biliary ducts, kidney, pancreas, bowel, ovary, mesentery, and miscellaneous tissues. (C) 2013 Elsevier Inc. All rights reserved.