Table 4.

The volume estimations of glass beads imaged by a spin echo sequence. The first column lists the diameters of glass beads measured by a vernier caliper. The second column lists the pseudo volume V₁. The third column lists the pseudo volume V₂. The fourth column shows the estimated volume V₀ from spin echo images. The fifth column is the calculated volume based on the first column. The sixth column is the difference in percentage between V₀ and V_0′. Accurate volume measurements of beads without MR signal can be obtained from spin echo images.

Diameters of	V1	V2	V0	V0′	Diff
glass beads (mm)	(mm3)	(mm3)	(mm3)	(mm3)	%
2.06 ± 0.05	320	57	4.4 ± 0.3	4.6 ± 0.3	4.3
3.08 ± 0.02	440	63	15.2 ± 0.3	15.3 ± 0.3	0.6
5.03 ± 0.10	1536	199	67.3 ± 0.4	66.6 ± 4.0	1.0
6.02 ± 0.10	1678	378	109.0 ± 0.8	114.2 ± 5.7	4.5