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Öğe The cutoff value for the diameter of the saphenous vein in predicting the presence of venous insufficiency(2018) Durmaz, Mehmet Sedat; Ozbakir, Bora; Cebeci, Hakan; Arslan, Serdar; Durmaz, Funda Gokgoz; Arslan, Fatma Zeynep; Tekin, Ali FuatAim: In this study aimed to investigate the relationship between saphenous vein diameters and reflux and to present their sensitivity and specificity values in predicting venous insufficiency (VI).Material and Methods: This study included 162 symptomatic patients admitted to our radiology clinic with complaints of VI in 317 of their lower extremities (LEs) and 67 asymptomatic healthy volunteers with their 134 LEs having no varicose veins. A total of 451 LEs were evaluated for VI with Doppler ultrasonography (US) in the standing position. Results: The saphenous vein diameters were higher at a statistically significant level in the symptomatic patient group than in the asymptomatic healthy volunteers (p<0.001). They were also higher at a statistically significant level in the LEs with clinically significant reflux (p<0.001). A cutoff value of a 5.35 mm diameter for insufficiency in great saphenous vein (GSV) led to 80.20% sensitivity and 79.20% specificity; a 4.85 mm diameter for insufficiency in small saphenous vein (SSV) led to 82.10% sensitivity and 83.60% specificity. Conclusions: A GSV diameter of > 5.35 mm and a SSV diameter of > 4.85 mm are the best cutoff values, which could be used as an additional parameter, for predicting VI with high sensitivity and specificity.Öğe Magnetic Resonance Imaging Texture Analysis in the Detection of Metastatic Lymph Nodes in Patients with Nasopharyngeal Carcinoma(Selçuk Üniversitesi, 2023 Ağustos) Özer, Halil; Batur, Abdussamet; Özdemir, Nurullah; Durmaz, Mehmet Sedat; Kılınçer, AbidinAims: To investigate the role of magnetic resonance imaging (MRI) texture analysis (TA) in the detection of metastatic lymph nodes in patients with nasopharyngeal carcinoma (NPC). Material and methods: Between January 2020 and October 2021, 15 NPC patients with 32 metastatic lymph nodes and 30 healthy subjects with benign lymph nodes were included in the study. The texture features compared between metastatic and benign lymph nodes. The independent predictor parameters of metastatic lymph nodes were determined using multivariate regression analysis. Receiver operator characteristics (ROC) analysis was used to evaluate the diagnostic performance of the regression models. Results: The first order texture features did not differ significantly between groups (p>0.05). Except for correlation in metastatic lymph nodes, all gray-level co-occurrence matrix (GLCM) and graylevel run length matrix (GLRLM) features were significantly different (p<0.05). The GLCM features of joint entropy, joint energy, and maximum probability; and the GLRLM features of gray level non uniformity and low gray level run emphasis were independent predictors of metastatic lymph nodes. The area under the curve (AUC) values for the GLCM regression model and GLRLM regression model were 0.975 and 0.928, respectively. Conclusion: MRI texture analysis may be useful to detect metastatic lymph nodes in patients with NPC by providing quantitative information on tissue heterogeneity and cellular composition.Öğe Multidetector computed tomography and magnetic resonance imaging findings in pulmonary hydatid cysts(2019) Cebeci, Hakan; Ozlu, Mustafa Yasir; Kilincer, Abidin; Uysal, Emine; Durmaz, Mehmet Sedat; Ucar, Ramazan; Sunam, Guven SadiAim: Computed tomography (CT) and magnetic resonance imaging (MRI) are diagnostic modalities in pulmonary hydatid disease.We aimed to present CT and MRI findings in pulmonary hydatid disease.Material and Methods: CT and MRI findings of pulmonary hydatid cysts from January 2011 through June 2018 were evaluatedretrospectively. CT images of 112 patients and MRI images of 27 patients were evaluated. Patients’ gender and ages, lesion numberand distribution, concomitant organ involvement, complications, HU density of lesions on CT and signal characteristics of lesions onMRI were analyzed. T2 hypointense rim, T1 and T2 signal intensity, daughter vesicle and detached membranes were the evaluatedparameters on MRI.Results: 147 hydatid cyst lesions of 119 (66 female, 53 male) patients with a mean age of 39.419.6 years were included in the study62 (52.1%) of patients had isolated lung involvement. 79 of 119 patients (66.4%) had solitary lung lesion. Mean CT density of cystswere 16 HU. 25 of 32 cysts showed T2 hypointense rim on MRI.Conclusion: Imaging plays important role in diagnosis and presurgical evaluation of pulmonary hydatid disease. CT is mostly usedin diagnosis; MRI should be a choice particularly in pediatric population.Öğe Over Kan Akımının Değerlendirilmesinde Transabdominal Superb Mikrovasküler Görüntüleme ve Konvansiyonel Doppler Görüntüleme Tekniklerinin Karşılaştırılması(Selçuk Üniversitesi, 2019 Mart) Arslan, Serdar; Durmaz, Mehmet SedatAmaç: Bu çalışmada, transabdominal Superbmikrovasküler görüntüleme (SMG), color Doppler (CD) ve power Doppler (PD) görüntüleme yöntemlerinin sağlıklı gönüllülerde intraovarianvaskülariteyi saptamada etkinliği karşılaştırılmıştır. Gereç ve Yöntem: Çalışmaya yaşları 0 – 34 arasında olan 81 sağlıklı gönüllü (n = 162over) dahil edildi. Tüm katılımcılar transabdominal B-modultrasonografi, CD, PD ve SMG ile ayrı ayrı incelendi. Over hacimleri B-mod ultrasonografi ile ölçüldü, ardından CD, PD, SMG (cSMG) ve monokrom SMG (mSMG) yoluyla over kan akımları değerlendiriledi. Bulgular: SMG, over dokusunda düşük hızlı kan akım sinyallerini saptamada CD ve PD'den daha etkiliydi (p> 0.001). CD, PD, cSMG ve mSMG'deki ortalama ovaryanvaskülerite skoru sırasıyla, 0,5 ± 1, 1,8 ± 1,5, 3,3 ± 1,3 ve 4,3 ± 0,9 idi.Over hacimleri ve sağlıklı gönüllülerin yaş ortalaması azaldıkça, mSMG ve cSMG yöntemleri konvansiyonel Doppler tekniklerine göre overvaskülaritesini daha iyi gösterdi. Sonuç: Transabdominal SMG, overvasküleritesini diğer konvansiyonel Doppler tekniklerine kıyasla daha ayrıntılı göstermektedir. SMG, özellikle çocuk hastalarda overvasküleritesinin değerlendirilmesi için inceleme protokolünün bir parçası olmalıdır.Öğe Quantitative assessment of thyroid gland vascularization with vascularization ındex using color superb microvascular ımaging in pediatric patients with hashimoto thyroiditis(LIPPINCOTT WILLIAMS & WILKINS, 2019) Durmaz, Mehmet Sedat; Akyürek, Nesibe; Kara, Turgay; Ateş, Fatih; Özbakir, Bora; Durmaz, Funda Gökgöz; Karaağaç, Seda Soğukpınar; Öztürk, MehmetThe study aimed to investigate the effectiveness of the vascularization index (VI) obtained using superb microvascular imaging (SMI) technique in the diagnosis of Hashimoto thyroiditis (HT). The thyroid glands of 80 patients with HT and 107 healthy, asymptomatic participants were examined using SMI. The thyroid parenchyma echogenicity was evaluated, and the thyroid gland volume was measured. Vascularization index measurements were performed by manually drawing the contours of the thyroid parenchyma using the free region of interest with color 2-dimensional SMI VI mode. The quantitative VI values of the patients and the asymptomatic group were compared. Correlations between VI values and thyroid autoantibodies and thyroid hormone levels were analyzed. The mean VI value of the thyroid gland was 4.74% +/- 1.96% in the asymptomatic group and 12.45% +/- 5.87% in HT patients with a statistically significant difference (P < 0.001). Hashimoto thyroiditis can be diagnosed with 86.3% sensitivity and 82.2% specificity when 6.00% VI value was designated as the cutoff value. There was a positive significant correlation between the VI value and the thyroid-stimulating hormone, antithyroglobulin antibodies, anti-thyroid peroxidase antibody levels (P < 0.05); however, no significant correlation was found between the VI values and thyroglobulin and free thyroxine levels (P > 0.05). There was a significant negative correlation between the VI values and the parenchyma echogenicity and positive significant correlation between the thyroid gland volume and the antithyroglobulin antibody and anti-thyroid peroxidase antibody levels (P < 0.05). The VI obtained using the SMI technique can be effectively used as an imaging method for the diagnosis of HT because of its high sensitivity and specificity in representing objective, quantitative numerical values.Öğe Shear wave elastography evaluation of testes in patients with varicocele(Lippincott Williams and Wilkins, 2020) Erdoğan, Hasan; Durmaz, Mehmet Sedat; Arslan, Serdar; Gokgoz Durmaz, Funda; Cebeci, Hakan; Ergun, Osman; Soğukpınar Karaağaç, SedaWe aimed to determine histological damage in patients with varicocele by comparing the elasticity of their affected testes with that of their normal contralateral testes as well as normal testes of control subjects without varicocele using shear wave elastography (SWE). In total, 48 patients with varicocele (96 testes) and 52 control subjects (104 testes) were included in this study. Shear wave elastography values were measured in the longitudinal plane using an oval region of interest that covered as much of the testicular contours as possible. Fifty testes with varicocele were classified as group A, 46 normal contralateral testes of the same patients as group B, and 104 normal testes of control subjects as group C. The normal group C testes were randomly chosen from patients who had applied for ultrasonography for any reason and agreed to participate in the study. The testicular volume and SWE values were compared between these 3 groups. The average age of the patients was 28.45 years, and no significant difference in age was found between the 3 groups (P = 0.665). A significant difference in the testicular volume was found between groups A and C (P = 0.014). The SWE values were significantly higher in group A than in groups B and C (P < 0.001). No significant correlation was observed between the testicular volume and SWE values in any of the groups. Our results showed that SWE can be used as an effective technique to assess testicular stiffness in patients with varicocele to predict interstitial fibrosis and the severity of histological damage.
