In vivo mapping of local cerebral blood flow by xenon-enhanced computed tomography

Measurement of local cerebral blood flow by xenon-enhanced computerized tomography imaging: a critique of an error assessment

A review of an error assessment of local cerebral blood flow values derived from xenon-enhanced computerized tomography imaging indicates that the authors have failed to consider the appropriate parameters, thereby yielding errors that are larger than the true errors.

Progress in cerebrovascular disease: local cerebral blood flow by xenon enhanced CT

A noninvasive technique for measuring local cerebral blood flow (LCBF) by xenon enhanced x-ray transmission computed tomography (CT) has been developed an reported quite extensively in recent years. In this method, nonradioactive xenon gas in inhaled and the temporal changes in radiographic enhancement produced by the inhalation are measured by sequential computed tomography. Time dependent xenon concentrations within various tissue segments in the brain are used to derive both local partition coefficient (lambda) and LCBF. An assessment of this method reveals that although it provides functional mapping of blood flow with excellent anatomic specificity, there are distinct limitations. The assumptions underlying this methodology are examined and problems associated with various potential applications of this technique are discussed.