Table 1. List of pediatric whole-body models currently available.

Model Name	Charlie	Nina	Roberta	Korean Child model ETRI	UF Family of reference hybrid phantoms	GSF Family (Baby,Child)	Pediatric xCAT phantoms	Chinese family phantom USTC
Year of model released	2014	2014	2014	2009	2010	2003	2015	2017
Imaging modalities used	GSF family, Baby [29]	Roberta [21]	MRI	MRI	CT	CT	PET-CT	RPI mesh phantom [30]
Age imaging scans used for segmentation	Eight-week-old	3-year-old	5-year-old	7-year-old	Newborn, 1-,5- and 10-year- old	Eight-week-old and 7-year-old	Newborn,1-,5-,10-,15-year-old	5-, 10-,15-year-old
Number of tissue varieties	45 tissues	75 tissues	78 tissues	44 tissues	47 tissues	41 tissues	64 tissues	50 tissues
Segmented both white- and grey-matter	Yes	Yes	Yes	Yes	No	No	No	No
Morphing or adjustments used	No	Yes	No	Yes	Yes	Yes	Yes	Yes Database: 50th percentile population
Method of validation	Anatomical knowledge	Anatomical knowledge	Anatomical knowledge	Comparison with the physiques measurement of reference models	Comparison with the physiques measurement of reference models	Comparison with the physiques measurement of reference models	Comparison with the physiques measurement of reference models	Comparison with the physiques measurement of reference models
Is the model freely accessible to the research community	No	No	No	No	Yes, upon request	Yes, upon request	No	Information not available
References/company	Petoussi-Henss et al., 2002 [29] /IT’IS [21]	IT’IS [21]	IT’IS [21]	Lee et al., 2009 [31]	Lee et al., 2010 [32]	Petoussi-Henss et al. 2002 [29] / Helmholtz Zentrum München	Segars et al., 2015 [33, 34]	Pi et al., 2017 [35]