Effectiveness of magnetic resonance imaging and spiral computed tomography in the staging and treatment prognosis of colorectal cancer

Table 1 Comparison of diagnostic efficacy of magnetic resonance imaging and spiral computed tomography in T staging

Index	Pathological stage
	T1	T2	T3	T4
MRI
Sensitivity	82.61 (19/23)	73.91 (17/23)	78.13 (25/32)	76.47 (13/17)
Specificity	94.44 (68/72)	87.50 (63/72)	92.06 (58/63)	96.15 (75/78)
Accuracy	91.58 (87/95)a	84.21 (80/95) a	87.37 (83/95)a	92.63 (88/95)a
SCT
Sensitivity	78.26 (18/23)	65.22(15/23) a	62.50 (20/32)a	52.94 (9/17)a
Specificity	91.67 (66/72)a	86.11 (62/72)a	82.54 (52/63)a	92.31 (72/78)a
Accuracy	88.42 (84/95)a	81.05 (77/95)a	75.79 (72/95)a	85.26 (81/95)a
MRI + SCT
Sensitivity	95.65 (22/23)	95.65 (22/23)	93.75 (30/32)	94.12 (16/17)
Specificity	98.61(71/72)	95.83 (69/72)	98.41 (62/63)	100.00 (78/78)
Accuracy	97.89 (93/95)	95.79 (91/95)	96.84 (92/95)	98.95 (94/95)

^aP < 0.05, indicates comparison with magnetic resonance imaging + spiral computed tomography. MRI: Magnetic resonance imaging; SCT: Spiral computed tomography.

Table 2 Comparison of diagnostic efficacy of magnetic resonance imaging and spiral computed tomography in N staging

Index	Pathological stage
	N0	N1	N2
MRI
Sensitivity	74.36 (29/39)	72.73 (16/22)	73.53 (25/34)
Specificity	89.29 (50/56)	80.82 (59/73)	91.80 (56/61)
Accuracy	83.16 (79/95)	77.95 (75/95)	85.26 (81/95)
SCT
Sensitivity	61.54 (24/39)a	68.18 (15/22)	52.94 (18/34)a
Specificity	87.50 (49/56)	67.12 (49/73)a	88.52 (54/61)
Accuracy	76.84 (73/95)	67.37 (64/95)a	75.79 (72/95)a
MRI + SCT
Sensitivity	87.18 (34/39)	81.81 (18/22)	79.41 (27/34)
Specificity	94.64 (53/56)	86.30 (63/73)	95.08 (58/61)
Accuracy	91.58 (87/95)	85.26 (81/95)	89.69 (85/95)

^aP < 0.05, indicates comparison with magnetic resonance imaging + spiral computed tomography. MRI: Magnetic resonance imaging; SCT: Spiral computed tomography.

Table 3 Comparison of diagnostic efficacy of magnetic resonance imaging and spiral computed tomography in M staging

Index	Pathological stage
	M0	M1
MRI
Sensitivity	95.45 (42/44)	98.04 (50/51)
Specificity	98.04 (50/51)	95.45 (42/44)
Accuracy	96.84 (92/95)	96.84 (92/95)
SCT
Sensitivity	93.18 (41/44)	92.16 (47/51)a
Specificity	92.16 (47/51)	93.18 (41/44)
Accuracy	92.63 (88/95)	92.63 (88/95)a
MRI + SCT
Sensitivity	97.73 (43/44)	100.00 (51/51)
Specificity	96.08 (49/51)	97.73 (43/44)
Accuracy	96.84 (92/95)	98.95 (94/95)

^aP < 0.05, indicates comparison with magnetic resonance imaging + spiral computed tomography. MRI: Magnetic resonance imaging; SCT: Spiral computed tomography.

Table 4 Predictive value of magnetic resonance imaging and spiral computed tomography

Index	AUC	95%CI	Sensitivity	Specificity	P value
BV	0.750	0.612-0.889	0.714	0.778	0.003
BF	0.683	0.559-0.806	0.857	0.593	0.030
TTP	0.772	0.633-0.910	0.643	0.802	0.001
PS	0.761	0.615-0.906	0.643	0.840	0.002
Kep	0.709	0.538-0.880	0.786	0.691	0.013
Ktrans	0.719	0.536-0.902	0.714	0.753	0.009
Ve	0.910	0.825-0.995	0.786	0.914	< 0.001

AUC: Area under the curve; BV: Blood volume; BF: Blood flow; CI: Confidence interval; K_ep: Blood reflux constant; K^trans: Volume transfer constant; PS: Permeability surface; TTP: Time to peak; V_e: Extracellular extravascular space volume fraction.