Table 4.

Mean RE (in %) obtained measuring the wall thickness (WT) on the eight phantom tubes using the proposed method (CNR) in comparison with FWHM and ZCSD. Smallest relative error is reported in bold. For completeness, the last column reports the relative error obtained measuring the lumen of the tubes with CNR (traditional methods only provide WT). All results are in %.

Tube	CNR WT	FWHM WT	ZCSD WT	CNR Lumen
A	−2.5	−115.1	−126.1	4.6
B	17.5	−25.9	−33.6	−6.3
C	−28.9	−23.6	−46.2	7.6
D	−12.8	−474.0	−79.0	10.4
E	−13.0	−4884.6	−20.5	9.8
F	2.4	−55.3	−59.8	−5.2
G	5.4	−18.06	−29.2	−7.8
H	18.5	−30.7	−40.3	−5.2