Calibration of a total body potassium monitor with an anthropomorphic phantom
| Autor: | Barry J. Allen, R D Hansen |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Adult
Male Supine position Coefficient of variation Potassium Potassium Radioisotopes chemistry.chemical_element Sodium Iodide chemistry.chemical_compound Absorptiometry Photon Calibration Humans Radiology Nuclear Medicine and imaging Aged Mathematics Anthropometry Radiological and Ultrasound Technology Phantoms Imaging business.industry Body Weight Middle Aged Total body potassium Body Height Skinfold Thickness Skinfold thickness chemistry Sodium iodide Body Constitution Regression Analysis Female Anthropomorphic phantom Nuclear medicine business |
| Zdroj: | Physics in Medicine and Biology. 41:2447-2462 |
| ISSN: | 1361-6560 0031-9155 |
| DOI: | 10.1088/0031-9155/41/11/015 |
| Popis: | An anthropomorphic phantom was used to calibrate a supine geometry sodium iodide total body potassium monitor. Correction factors accommodating variability in subject size were empirically determined. Measurements on 12 males of weight 45-96 kg, height 161-184 cm and 18 females of weight 48-89 kg, height 153-175 cm, showed that the 40K calibration factor (F, counts s-1 (g of potassium)-1) was significantly correlated (r = 0.88, p0.0001) to subject (weight/height)0.5, indicating comparable accuracy to 42K-based calibration procedures. Fat-free mass determined from the potassium measurements of 16 subjects correlated significantly with fat-free mass estimated from skinfold thickness (r = 0.98, p0.0001), dual-energy x-ray absorptiometry (r = 0.99, p0.0001) and bioimpedance analysis (r = 0.98, p0.0001). These data, together with the precision (coefficient of variation, CV = 1.5%) and accuracy (CV = 4.5%) of the system, indicate that this calibration procedure represents a relatively low-cost, non-invasive alternative to 42K-based methods of calibrating total body potassium monitors. |
| Databáze: | OpenAIRE |
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