Evaluation of a rabbit rectal VX2 carcinoma model using computed tomography and magnetic resonance imaging

Table 1 Gross tumor volume and TGR after tumor implantation

Time after implantation	a (mm)	b (mm)	V (mm3)	TGR (%)
2 wk	5.029 ± 0.544	4.129 ± 0.475	46.180 ± 14.583	-
3 wk	16.783 ± 1.387	9.942 ± 1.326	848.239 ± 270.715	1736.8
4 wk	19.419 ± 1.150	15.800 ± 1.255	2443.569 ± 480.966	185.7
5 wk	24.763 ± 1.762	22.163 ± 1.388	6163.157 ± 1181.274	159.3

Tumor volume (V) = 0.5 (a × b²), where a and b represent the maximum and minimum tumor diameters, respectively; TGR = (V₂ - V₁)/V₁× 100%, where V₁ represents the gross tumor volume measured at an earlier time point and V₂ represents the gross tumor volume measured at a later time point.