. Author manuscript; available in PMC: 2008 Jun 1.

Published in final edited form as: Eur J Nucl Med Mol Imaging. 2008 Feb 9;35(6):1192–1203. doi: 10.1007/s00259-008-0736-y

Table 4.

Urinary excretion of [¹⁴C]choline and [¹⁸F]FCH metabolites

Metabolite	Radioactivity (% dose) at 5 min post-injection		Radioactivity (% dose) at 20 min post-injection
Metabolite	¹⁴C	¹⁸F	¹⁴C	¹⁸F
Betaine	0.03±0.01	0.05±0.01	0.2±0.05	0.4±0.06^*
Choline	1.4±0.4	2.4±0.9	3.2±0.8	6.1±1.3^*
Phosphocholine	n.d.	n.d.	n.d.	n.d.

P value < 0.05 versus ¹⁴C using paired t-test; n.d. - not detected

Values are mean ± standard deviation for N=4