. Author manuscript; available in PMC: 2014 Jan 6.

Published in final edited form as: J Rheumatol. 2011 Jul;38(7):10.3899/jrheum.110272. doi: 10.3899/jrheum.110272

Table 1.

Quantitative methods of tophus measurement

Method	Category	Original reference describing the method
Counting the total number of subcutaneous tophi	Simple	(8)
Tape measurement of subcutaneous tophus area	Simple	(11)
Vernier calipers for measurement of subcutaneous tophus diameter	Simple	(12)
Digital photography for measurement of subcutaneous tophus area	Complex	(13)
Ultrasonography for measurement of tophus diameter and volume	Complex	(14)
Magnetic resonance imaging for measurement of tophus volume	Complex	(15)
Conventional computed tomography for measurement of tophus volume	Complex	(16)
Dual energy computed tomography for measurement of tophus volume	Complex	(17)