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    Comparison of chest computed tomography and 3-T magnetic resonance imaging results in patients with common variable immunodeficiency
    (SAGE Publications Inc., 2023) Bayraktaroğlu, S.; Çinkooğlu, A.; Tunakan, Dalgıç, C.; Boğatekin, G.; Uysal, F.E.; Ardeniz, Ö.
    Background: Patients with common variable immunodeficiency (CVID) have an increased incidence of pulmonary infections and require frequent follow-up computed tomography (CT) scans. Purpose: To evaluate the diagnostic performance of 3-T magnetic resonance imaging (MRI) in patients with CVID. Material and Methods: In this prospective study, 3-T MRI was performed in 20 patients with CVID. The patients were imaged with CT and MRI scans on the same day. The MRI protocol included a T2-weighted HASTE sequence (TR=1400 ms, TE=95 ms, slice thickness (ST)=3 mm), T2-weighted BLADE sequence (TR=5379 ms, TE=100 ms, ST=3 mm), and 3D VIBE sequence (TR=3.9 ms, TE=1.32 ms, ST=3 mm). Mediastinal and parenchymal changes were compared. A modified Bhalla scoring system was used in the evaluation of CT and MRI scans. Results: A total of 17 (85%) patients had parenchymal abnormalities identified by CT or MRI. Similar findings were detected with CT and MRI in the assessment of the severity of bronchiectasis (P=0.083), bronchial wall thickening (P=0.157), and mucus plugging (P=0.250). Consolidations were detected with both modalities in all patients. There was excellent concordance between the two modalities in the evaluation of nodules >5 mm (nodule size 5–10 mm, P=0.317; nodule size >10?mm, P=1). However, MRI failed to detect most of the small nodules (<5 mm). Conclusion: 3-T MRI detected mediastinal and parenchymal alterations in patients with CVID and provided findings that correlated well with CT. Despite a few limitations, MRI is a well-suited radiation-free technique for patients requiring longitudinal imaging. © The Foundation Acta Radiologica 2022.
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    Correlation of ADC values measured using 3T diffusion-weighted MRI and SUVs from fluorodeoxyglucose PET/CT in head and neck squamous cell carcinomas
    (Galenos Publishing House, 2020) Çolak, E.; Bayraktaroğlu, S.; Akagündüz, O.; Savaş, R.; Esassolak, M.
    Aims: The aim of our study was to assess the correlations between apparent diffusion coefficient (ADC) values and standardized uptake values (SUVs) and their correlations with tumor size, tumor stage and histological grade in patients with head and neck squamous cell carcinomas (HNSSCs). Methods: This retrospective study included 36 patients with histologically confirmed HNSSCs visible on diffusion weighted imaging (DWI) and fluorodeoxyglucose (FDG) positron emission tomography (PET/CT). Correlations of minimum ADC (ADCmin), mean ADC (ADCmean), and minimum-mean ADC ratio (ADCmin/mean) with maximum SUV (SUVmax) and lean body mass SUVlbm (SUVlbm) were analyzed using the Spearman's correlation test. The Kruskal-Wallis one-way ANOVA test and Mann-Whitney U test were used to assess the correlations of ADC values and SUVs with tumor size, tumor stage and histological grade. Two experienced readers measured the ADC and SUVs independently, and intraclass correlation coefficient (ICC) was used to analyze the inter-observer agreement. Results: The mean ADCmin, ADCmean, and ADCmin/mean for HNSSCs were 0.68±0.17x10-3 mm2/s, 0.82±0.17x10-3 mm2/s, and 0.83±0.10, respectively. The mean SUVmax and SUVlbm were 14.65±5.5 and 10.96±5.1, respectively. The correlations between ADC values and SUVs did not reach statistical significance. There were no significant correlations of ADC values and SUVs with tumor size, tumor stage or histological grade. There was a tendency of SUVs to increase and ADC values to decrease with tumor dedifferentiation; however, the changes were not significant. Inter-observer agreement for tumor ADC values and SUVs was almost perfect (ICC>0.81). Conclusions: Pretreatment ADC values and SUVs in HNSSCs are reproducible and independent biomarkers. © 2020 Galenos Publishing House.
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    Reduced CT-derived erector spinae muscle area: a poor prognostic factor for short- and long-term outcomes in idiopathic pulmonary fibrosis patients
    (W.B. Saunders Ltd, 2023) Çinkooğlu, A.; Bayraktaroğlu, S.; Ufuk, F.; Unat, Ö.S.; Köse, T.; Savaş, R.; Bishop, N.M.
    AIM: To assess the relationship between idiopathic pulmonary fibrosis (IPF) prognosis, baseline skeletal muscle mass, and attenuation on computed tomography (CT) and clinical parameters. MATERIAL AND METHODS: This retrospective cohort study enrolled 195 patients. The mean follow-up duration was 42.52 months. Erector spinae muscle area (ESMA), pectoralis muscle area (PMA), and the attenuation of the erector spinae muscle at the level of T12 vertebrae were measured. Muscle indexes were obtained by adjusting the measured muscle areas to the patients' heights. The relationship between baseline CT-derived muscle metrics and clinical parameters including short- and long-term mortality were evaluated. RESULTS: There was a moderate correlation between ESMA and PMA and pectoralis muscle index (PMI; r=0.536, p<0001 and r=0.403, p<0.001 respectively). ESMA correlated significantly with forced expiratory volume in 1 second (FEV1; hazard ratio [HR] = 0.488 p<0.001) and forced vital capacity (FVC; HR=0.501, p<0.001). Compared with PMA, ESMA was more strongly associated with 1- and 2-year mortality in patients with IPF (HR=0.957, p=0.022). The survival rate in male patients with sarcopenia was significantly worse (p=0.040). CONCLUSION: ESMA measurements obtained from CT correlated with clinical parameters in IPF patients and were also predictors of short- and long-term survival. © 2023