Evaluation of the 11CO2 positron emission tomographic method for measuring brain pH. I. pH changes measured in states of altered PCO2
| Autor: | John A. Correia, Viken L. Babikian, Richard B. Buxton, Steven B. Weise, Robert H. Ackerman, Nathaniel M. Alpert |
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| Rok vydání: | 1987 |
| Předmět: |
Bicarbonate
Analytical chemistry Root mean square chemistry.chemical_compound Positron Dogs medicine Animals Carbon Radioisotopes Administration Intranasal medicine.diagnostic_test Chemistry business.industry Washout Brain Blood flow Arteries Carbon Dioxide Hydrogen-Ion Concentration Oxygen Kinetics Neurology Positron emission tomography Neurology (clinical) Tomography Cardiology and Cardiovascular Medicine Nuclear medicine business Emission computed tomography Tomography Emission-Computed |
| Zdroj: | Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism. 7(6) |
| ISSN: | 0271-678X |
| Popis: | The 11CO2 method for measuring local brain pH with positron emission tomography (PET) has been experimentally evaluated, testing the adequacy of the kinetic model and the ability of the method to measure changes in brain pH. Plasma and tissue time/activity curves measured during and following continuous inhalation of 11CO2 were fit with a kinetic model that includes effects of tissue pH, blood flow, and fixation of CO2 into compounds other than dissolved gas and bicarbonate ions. For each of ten dogs, brain pH was measured with PET at two values of PaCO2 (range 21–67 mm Hg). The kinetic model fit the data well during both inhalation and washout of the label, with residual root mean square (RMS) deviations of the model from the measurements consistent with the statistical quality of the PET data. Brain pH calculated from the PET data shows a linear variation with log(PaCO2). These results were in good agreement with previously reported measurements of brain pH, both in absolute value and in variation with PCO2. The interpretation of these pH values in normal and pathological states is discussed. |
| Databáze: | OpenAIRE |
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