@article{oai:kanazawa-u.repo.nii.ac.jp:00013680,
 author = {Nakajima, Kenichi and Okuda, Koichi and Matsuo, Shinro},
 issue = {1},
 journal = {European Journal of Nuclear Medicine and Molecular Imaging},
 month = {Jan},
 note = {Purpose: This study was performed to demonstrate that the results obtained with a calibration phantom could be used as a tool for standardizing measurement of heart to mediastinum (H/M) ratio in cardiac metaiodobenzylguanidine (MIBG) imaging. Methods: Images of the phantom containing 123I-MIBG were acquired on the cameras in 10 hospitals (11 camera types) to determine the relationship between H/M ratios using different collimators: low-energy (LE) and mediumenergy (ME)/low-medium-energy (LME) collimators. The effect of standardization on the ME-comparable H/M ratio was examined in two settings: a Japanese standard MIBG database (n=62) and multicentre studies (n=49). In a multicentre study, probable Alzheimer's disease (AD, n=18) and probable dementia with Lewy bodies (DLB, n=31) were studied and standardized by the calibration phantom method. Results: Linear regression equations between LE and ME collimators were obtained for the phantom study in all institutions. When the H/M ratio with an LE collimator wascorrected based upon the calibration phantom, the corrected values were comparable to those obtained using ME collimators. The standard database also exhibited a normal distribution after standardization as determined by skewness and goodness-of-fit test. A mixture of the populations by LE and ME collimators showed significant separation of AD and DLB groups (F ratio=24.9 for the late H/M), but the corrected values resulted in higher F ratios for both early and late H/M (F ratio=34.9 for the late H/M). Conclusion: Standardization of H/M ratios by the heartchest calibration phantom method is feasible among different collimator types. This method could be practically used for multicentre comparison of H/M ratios. © Springer-Verlag 2011.},
 pages = {113--119},
 title = {Standardization of metaiodobenzylguanidine heartto mediastinum ratio using a calibration phantom: Effects of correction on normal databases and a multicentre study},
 volume = {39},
 year = {2012}
}