European Radiology Experimental

Table 3 Spearman rank correlation with micro-CT: coefficients with 95% confidence intervals for the eight analysed structure parameters

From: Photon-counting detector CT and energy-integrating detector CT for trabecular bone microstructure analysis of cubic specimens from human radius

Scanner	Average measures					Dispersion measures
Scanner	BVTV	Tb.Th	Tb.Sc	Tb.Sp	Tb.Nd	s(Tb.Th)	s(Tb.Sc)	s(Tb.Sp)
PCD-CT² 51	0.98	0.92	0.83	0.84	0.95	0.44	0.67	0.81
	(0.94; 0.99)	(0.75; 0.97)	(0.53; 0.94)	(0.56; 0.95)	(0.84; 0.98)	(−0.12; 0.79)	(0.22; 0.89)	(0.48; 0.94)
	p< 0.001	p < 0.001	p < 0.001	p < 0.001	p < 0.001	p = 0.116	p = 0.010	p= 0.001
PCD-CT² 30	0.98	0.93	0.85	0.87	0.96	0.49	0.71	0.81
	(0.94; 0.99)	(0.79; 0.98)	(0.59; 0.95)	(0.64; 0.96)	(0.89; 0.99)	(−0.05; 0.81)	(0.30; 0.90)	(0.48; 0.94)
	p< 0.001	p< 0.001	p< 0.001	p< 0.001	p< 0.001	p= 0.078	p= 0.006	p= 0.001
PCD-CT² 18	0.98	0.92	0.83	0.87	0.95	0.46	0.71	0.81
	(0.94; 0.99)	(0.75; 0.97)	(0.54; 0.95)	(0.64; 0.96)	(0.85; 0.98)	(−0.09; 0.80)	(0.29; 0.90)	(0.48; 0.94)
	p< 0.001	p < 0.001	p < 0.001	p< 0.001	p < 0.001	p = 0.097	p = 0.006	p= 0.001
EID-CT¹ 1000	0.98	0.77	0.81	0.77	0.95	−0.04	0.69	0.76
	(0.94; 0.99)	(0.40; 0.92)	(0.49; 0.94)	(0.40; 0.92)	(0.85; 0.98)	(−0.56; 0.50)	(0.25; 0.89)	(0.38; 0.92)
	p< 0.001	p = 0.001	p = 0.001	p = 0.002	p < 0.001	p = 0.892	p = 0.008	p = 0.002
EID-CT¹ 600	0.97	0.64	0.83	0.80	0.88	−0.04	0.66	0.70
	(0.90; 0.99)	(0.17; 0.88)	(0.54; 0.95)	(0.46; 0.93)	(0.66; 0.96)	(−0.56; 0.50)	(0.19; 0.88)	(0.26; 0.90)
	p < 0.001	p = 0.015	p < 0.001	p < 0.001	p < 0.001	p = 0.892	p = 0.013	p = 0.007

Bold numbers indicate the highest correlation for each parameter. BVTV Bone volume fraction, EID-CT Multislice computed tomography using energy-integrating detectors (¹), PCD-CT Multislice computed tomography using photon-counting detectors (²), Tb.Nd Trabecular nodes, Tb.Th Trabecular thickness, Tb.Sc Trabecular spacing, Tb.Sp Trabecular separation. s(Tb.Th), s(Tb.Sc) and s(Tb.Sp) are the intra-volume standard deviation for Tb.Th, Tb.Sc and Tb.Sp, respectively. The numbers after the type of scanner correspond to the field of view in mm (PCD-CT) and quality reference tube load in mAs (EID-CT)

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