Comparison of six quantitative methods for the measurement of bone turnover at the hip and lumbar spine using F-18-fluoride PET-CT

作者：Puri Tanuj^*; Blake Glen M; Frost Michelle L; Siddique Musib; Moore Amelia E B; Marsden Paul K; Cook Gary J R; Fogelman Ignac; Curran Kathleen M

来源：Nuclear Medicine Communications, 2012, 33(6): 597-606.

DOI：10.1097/MNM.0b013e3283512adb

• bone metabolism
• comparison
• fluorine-18
• positron emission tomography
• quantification methods

Aim The aim of this study was to evaluate the relationship between different quantification methods used for the measurement of bone plasma clearance (K-i) using F-18-PET at the hip and lumbar spine. %26lt;br%26gt;Methods Twelve healthy postmenopausal women aged 52-71 years were recruited. Each participant underwent 60-min dynamic F-18-PET scans at the lumbar spine and hip on two separate occasions with an injected activity of 90 and 180 MBq, respectively. Image-derived input functions were obtained at the aorta from the lumbar spine scans. K-i was evaluated using a three-compartment four-parameter model (Ki-4k), three-compartment three-parameter model (Ki-3k), Patlak analysis (Ki-Pat), spectral analysis (Ki-Spec) and deconvolution (Ki-Decon). Standardized uptake values (SUVs) were also measured. %26lt;br%26gt;Results The Pearson correlation between Ki-4k and Ki-3k, Ki-Pat, Ki-Spec, Ki-Decon and SUV were 0.91, 0.97, 0.94, 0.95 and 0.93, respectively, with a significance of P less than 0.0001. The differences between the correlations measured using Fisher%26apos;s Z-test were not significant (P%26gt;0.05). Bland-Altman analysis showed that the limits of agreement for K-i measured as the SD of the differences were 0.0082 (25.9%), 0.0062 (11.7%), 0.0098 (20.1%) and 0.0056 (25.5%) ml/min/ml, respectively, and the biases were -0.0081 (-23.8%), -0.0075 (-23.7%), -0.0107 (-29.5%) and -0.0015 (0.8%) ml/min/ml, respectively. %26lt;br%26gt;Conclusion All five methods of quantification (Ki-3k, Ki-Pat, Ki-Spec, Ki-Decon and SUV) strongly correlated with Ki-4k. Although systematic differences of up to 29% were found between Ki-4k and the other methods (Ki-3k, Ki-Pat, Ki-Spec and Ki-Decon), these should not affect the conclusions of clinical studies, provided the methods are applied consistently. However, care should be taken when comparing reports that use different methods of quantification.

• 出版日期2012-6