title: Remote measurement of fluid volume by x-ray fluorescence.
abstract: A technique utilizing x-ray fluorescence has been used to measure remotely the volume and, thereby, the hydrostatic pressure of a cesium nitrate solution in vitro. The excitation radiation source was 99m-Tc, and the x-ray spectra were measured with a sodium iodide spectrometry system. This technique may be applicable to long term in vivo measurements of intracranial pressure for conditions such as hydrocephalus.
mesh_terms: D002586:Cesium; D005453:Fluorescence; D006874:Hydrostatic Pressure; D008722:Methods; D009566:Nitrates; D055585:Physical Phenomena; D010825:Physics; D013057:Spectrum Analysis; D013667:Technetium; D014965:X-Rays / Q000295:instrumentation
chemical_list: D009566:Nitrates; D002586:Cesium; D013667:Technetium