Hasan T Ozgur

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Scholarly Contributions

Chapters

• Bellon, R., & Özgür, H. T. (2000). Interventional Neuroradiology. In Neuroimaging. doi:10.1007/978-1-4612-1152-5_24

Journals/Publications

• Gates, G. F., Aronsky, A., & Özgür, H. T. (2006). Intracardiac Extension of Lung Cancer Demonstrated on PET Scanning. Clinical Nuclear Medicine. doi:10.1097/01.rlu.0000197051.74922.02
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  Intracardiac tumors are unusual and can originate within the heart or spread from other sites. This is a report of a patient who presented with a TIA, and during the subsequent stroke workup, a right hilar nonsmall cell lung carcinoma was discovered. The tumor had extended into the left atrium through a pulmonary vein. The hilar tumor as well as intracardiac extension were demonstrated by PET scanning using FDG.
• Krupinski, E. A., Labadie, E. L., Masaryk, A. M., Melgar, M., Ozgur, H. T., Seeger, J. F., Walsh, T. K., & Williams, W. (2001).

  Correlation of Cerebrovascular Reserve as Measured by Acetazolamide-challenged SPECT with Angiographic Flow Patterns and Intra- or Extracranial Arterial Stenosis

  . American Journal of Neuroradiology.
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  BACKGROUND AND PURPOSE: The ability to identify patients at increased risk for stroke from cerebral hemodynamic ischemia may help guide treatment planning. We tested the correlation between regional cerebrovascular reserve (rCVR) on acetazolamide-challenged single-photon emission CT (SPECT) brain scans and intracranial collateral pathways as well as extra- or intracranial (EC-IC) arterial stenosis on cerebral angiography. METHODS: A retrospective analysis of 27 patients who underwent cerebral angiography and acetazolamide-challenged SPECT brain imaging was performed. With cerebral angiography, the anterior, middle, and posterior cerebral artery (ACA, MCA, PCA) territories were evaluated for patterns of flow, including the ipsilateral carotid or basilar arteries, the circle of Willis collaterals, the EC-IC collaterals, and the leptomeningeal collaterals. With acetazolamide-challenged SPECT, the ACA, MCA, and PCA territories were classified as either showing or not showing evidence of decreased rCVR. Statistical significance was determined by the χ2 test. RESULTS: Patients with decreased rCVR had significantly greater dependence on either the EC-IC or leptomeningeal collaterals (42%) than did patients without decreased rCVR (7%). Similarly, the cerebral hemispheres with decreased rCVR showed a higher prevalence of 70% or greater stenosis or occlusion of the ipsilateral EC-IC arteries in the anterior circulation (74%) than did hemispheres with no evidence of decreased rCVR (16%), and this difference was also statistically significant. CONCLUSION: Acetazolamide-challenged SPECT brain scanning provides additional information regarding rCVR that is not reliably provided by cerebral angiography.
• Borders, G. T., Carmody, R. F., Erly, W. K., Gabaeff, D. R., Ozgur, H. T., Seeger, J. F., & Zaetta, J. M. (2000).

  Gadopentetate dimeglumine as a contrast agent in common carotid arteriography.

  . American Journal of Neuroradiology.
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  BACKGROUND AND PURPOSE: Despite improvements in noninvasive imaging, some patients with contraindications to iodine-based contrast material still require angiography for the evaluation of carotid stenosis. Our aim was to assess the utility of gadopentetate dimeglumine as an intraarterial contrast agent in common carotid angiography. METHODS : Twelve patients with suspected carotid artery stenosis were enrolled in the study. In addition to the standard injection sequences with iohexol, common carotid arteriograms were obtained after administration of gadopentetate dimeglumine. Neurologic status and vital signs were monitored during and for 6 hours after the examination. For each injection, five independent observers, blinded to the contrast agent used, measured the percentage of carotid stenosis and assessed their confidence in grading the stenosis, the overall quality of the examination, and, in cases of decreased quality, the reason(s) for it. Statistical analysis was done with paired and unpaired t -tests with equal variances. RESULTS : No patient had an adverse clinical outcome, and measurements of carotid artery stenosis showed no statistically significant differences between the gadopentetate dimeglumine and iohexol examinations. Overall image quality and observer confidence in measurements of stenosis on the gadolinium-based studies were slightly but significantly lower than those of identical iodine-based studies. CONCLUSION : Gadopentetate dimeglumine may be an alternative to iodine in selected patients undergoing carotid angiography. Although overall image quality of the gadolinium studies is slightly inferior to that of the iohexol studies, measurements of carotid artery stenosis are similar for the two examinations.
• Pereles, F. S., Özgür, H. T., Lund, P. J., & Unger, E. C. (1998). Potentials of a new laser guidance system for percutaneous musculoskeletal procedures. Skeletal Radiology. doi:10.1007/s002560050328
• Pereles, F. S., Özgür, H. T., Lund, P. J., & Unger, E. C. (1998). Potentials of laser guidance system for percutaneous musculoskeletal procedures. Skeletal Radiology. doi:10.1007/s002560050304
• Hulett, R. L., & Ozgur, H. T. (1997).

  Double blind ureteral duplication

  . Pediatric Radiology. doi:10.1007/s002470050183
• Ozgur, H. T., Unger, E. C., & Wright, W. H. (1996).

  Portal venous gas in a cardiac transplant patient.

  . American Journal of Roentgenology. doi:10.2214/ajr.166.4.8610594
• Özgür, H. T., Aytadar, S., & Ozgur, M. (1993). CT and US findings in a rarely seen case of cardiac echinococcosis: A case report. European Radiology. doi:10.1007/bf00167475