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Öğe Age and gender related changes in bronchial tree: a morphometric study with multidedector CT(VERDUCI PUBLISHER, 2016) Ulusoy, M.; Uysal, I. I.; Kivrak, A. S.; Ozbek, S.; Karabulut, A. K.; Paksoy, Y.; Unver Dogan, N.OBJECTIVE: The aims of this study are the identification of differences in the diameter, length, area and branching angles of the trachea and bronchi with gender and age, and the identification of trachea types by using MDCT images. PATIENTS AND METHODS: The thoracic MDCT images of 253 patients (0-74 years old, 142 male and 111 female) were evaluated. Tracheal diameter, tracheal cross-sectional area, diameter and length of bronchi, and several angles of the bronchial tree [e.g. subcarinal angles (SCA), interbronchial angles (IBA)] were measured. RESULTS: Average anteroposterior and transverse diameter of the trachea in adult patients were measured as 15.8 +/- 2.9 mm and 17.5 +/- 3.7 mm respectively. Average tracheal cross-sectional areas in adult patients were calculated as 160.7 +/- 41.3 mm(2) in females and as 275.7 +/- 57.3 mm(2) in males. Four types of trachea were identified as circular (68% in adults, 73% in children), oval (13%, 15%), rectangular (11%, 5%) and horseshoe shaped (8%, 7%). The average right and left SCA were calculated as 34.5 degrees +/- 8.1 degrees and 38.1 degrees +/- 8.9 degrees respectively. The average right and left IBA were calculated as 32.4 degrees +/- 7.7 degrees and 35.2 degrees +/- 8.1 degrees respectively. CONCLUSIONS: The findings of this study may be helpful during bronchoscopy and tube and stent application procedures. MDCT seems to be a convenient technique for the evaluation of the bronchial tree.Öğe Blood flow dynamics during spinal block: more questions than answers?(WILEY-BLACKWELL, 2012) Ozbek, S.; Apiliogullari, S.; Kivrak, A. S.; Koplay, M.[Abstract not Available]Öğe Comparison of CT virtual cystoscopy of the contrast material-filled bladder with conventional cystoscopy in the diagnosis of bladder tumours(W B SAUNDERS CO LTD, 2009) Kivrak, A. S.; Kiresi, D.; Emlik, D.; Odev, K.; Kilinc, M.AIM: To investigate the value of virtual cystoscopy using contrast material to fill the bladder during routine abdominopelvic computed tomography (CT) examinations for the detection of bladder tumours. MATERIALS AND METHODS: Thirty-three consecutive patients (25 men and eight women; are range 51-82 years; mean age +/- SD, 65 +/- 7 years) who had painless macroscopic haematuria and were suspected to have bladder neoplasms were prospectively evaluated with virtual cystoscopy. After intravenous injection of contrast medium, the contrast material-filled bladders were examined with single-detector helical CT with 2-mm section thicknesses. Source CT data were transferred to a workstation for interactive navigation using surface rendering. ALL the patients also underwent conventional cystoscopy. RESULTS: The results of virtual cystoscopy were compared with the findings from the conventional cystoscopy. Seventy-one of 78 bladder tumours detected with conventional cystoscopy in 28 patients were also shown on virtual images. The bladders of five patients appeared normal on both conventional cystoscopy and virtual cystoscopy. On virtual cystoscopy, seven of the 12 lesions that were <= 5 mm in diameter could be identified. The following statistical values for the identification of bladder lesions using virtual cystoscopy were calculated: sensitivity 94%, specificity 90%, positive predictive value 87%, negative predictive value 93%, and accuracy 93%. CONCLUSION: CT virtual cystoscopy is a noninvasive technique that can be used successfully for detection of bladder tumours >5 mm in selected cases during daily routine abdominopelvic work. (C) 2008 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.Öğe Subungual glomus tumour: magnetic resonance imaging findings(BLACKWELL PUBLISHING, 2007) Koc, O.; Kivrak, A. S.; Paksoy, Y.The present study aims to present a case of a subungual glomus tumour with literature to the findings on magnetic resonance (MR) imaging. A 51-year-old man consulted his physician because of a pain in the nail bed of his thumb, which he had had for 2 years. A plain radiography and MR examination was performed. Physical examination showed a blue-brown focus beneath the nail and there was deformation. A plain radiography demonstrated no abnormality. T1-weighted spin-echo images showed a well-marginated, oval, slightly hyperintense lesion (4 mm diameter) located in the subungual region. On turbo spin-echo T2-weighted images the lesion was hyperintense with a hypointense rim. T1-weighted spin-echo images after intravenous administration of contrast medium showed strong enhancement. The lesion was completely excised at surgery and the diagnosis of a glomus tumour was established histologically. In conclusion, MR imaging offers excellent diagnostic information about a clinically suspected glomus tumour.
