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عمومی::
رادیونوکلئید
Both computed tomographic (CT) cisternography and radionuclide cisternography require lumbar puncture for the
Radionuclide cisternography has poor sensitivity and poor spatial resolution.
Agents may be categorized as visible dyes, radionuclide markers, and radiopaque dyes.
Radioactive iodine (131I) serum albumen, technetium (99mTc)-labeled serum albumen and DTPA, and indium-111 pentetate have all been used for radionuclide cisternography, which involves the intrathecal administration of a radionuclide tracer via a lumbar puncture and subsequent monitoring of the distribution of tracer with a scintillation camera.
Pledget counts should be determined per unit mass of dry pledget, and a radionuclide ratio that compares tracer counts in the pledget against counts in a unit volume of peripheral blood should be calculated.59 An elevated ratio suggests the presence of a CSF fistula, and the distribution of counts across the pledgets may suggest the loca- tion of the defect.
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