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Mohammad Eskandari

Publications and source records attributed to Mohammad Eskandari.

2 recordsLinked to original sources
PubMed2005

Incidental findings in brain computed tomography scans of 3000 head trauma patients.

BACKGROUND: Limited reports exist about intracranial incidental findings on computed tomography (CT) imaging. We studied the frequency of incidental findings on 3000 brain CT scans of trauma patients. METHODS: Three thousands standard brain CT scans of trauma patients were evaluated for some incidental findings. Cisterna magna was evaluated in 1500 CT scans. RESULTS: In this study we found 30 incidental abnormalities that include 8 cases of tumor: 3 meningioma, 2 craniopharyngioma, 1 oligodendroglioma, 1 low-grade astrocytoma, and 1 medulloblastoma. Suspect osteoma was found in 3 cases. In 3 cases, abnormal calcification was found in pineal region, basal ganglia, and temporal horn area. Three suspect lipomas were found in midline and near midline of the brain. Arachnoid cyst was found in 7 cases and hydrocephaly in 3 cases. Large cisterna magna (>10 cm(3)) was found in 11 cases. CONCLUSION: Cisterna magna enlargement was the most common incidental finding and brain tumor and arachnoid cyst were next in frequency.

Adolescent↗
PubMedDate not supplied

Retinal oximetry using intravitreal illumination.

PURPOSE: To demonstrate spectroscopic retinal oximetry measurements on arteries and veins in swine using intravitreal illumination. Retinal arterial and venous saturations are measured for a range of inspired O2 levels after pars plana vitrectomy. METHODS: Pars plana vitrectomy and intravitreal manipulations were performed on two female American Yorkshire domestic swine. Light from a scanning monochromator was coupled into a fiberoptic intraocular illuminator inserted into the vitreous. The retinal vessels were illuminated obliquely, minimizing vessel glints. Multispectral images of the retinal vasculature were obtained as the swine's arterial blood oxygen saturation was decreased from 100% to 67% in decrements of approximately 10%. Retinal vessel spectra were used to calculate oxygen saturation in selected arteries and veins. Arterial oxygen saturations were calibrated using blood gas analysis on blood drawn from a Swan-Ganz catheter placed in the femoral artery. RESULTS: Oblique illumination of retinal vessels using an intravitreal fiberoptic illuminator provided a substantial reduction in the central vessel glint usually seen in fundus images, thus simplifying the analysis of spectral data. The vessel shadows were displaced from the vessel image simplifying the light paths in the eye. Using a full spectral analysis simplified by the light path reductions, we calculated retinal vessel saturations. The reduction of glint allowed for increased accuracy in measuring retinal vessel spectral optical density. Abnormally low retinal venous oxygen saturations were observed shortly after pars plana vitrectomy. CONCLUSIONS: Retinal oximetry using intravitreal illumination has been demonstrated. As a research tool, intravitreal illumination addresses several difficulties encountered when performing retinal oximetry with transcorneal illumination.

Animals↗