Postprocessing techniques of CT colonography in detection of colorectal carcinoma

Table 1 Circumferential extents, lesion lengths and pathology patterns in 64 colorectal carcinomas determined with postprocessing techniques

Item	Diagnostic accordance (n)					Accurate diagnosis (%)
	S&p c	MPR	VC	SSD	Raysum	MPR	VC	SSD	Raysum
Circumf extent	64	64	53	51	51	100.0	82.8	79.7	79.7
< 1/2 circum	7	7	6	6	6	100.0	85.7	85.7	85.7
1/2-3/4 circum	14	14	12	11	11	100.0	85.7	78.6	78.6
> 3/4 circum	43	43	35	34	34	100.0	81.4	79.1	79.1
Lesion length (cm)	64	57	49	61	64	89.1	76.6	95.3	100.0
2.0-3.0	6	6	6	6	6	100.0	100.0	100.0	100.0
3.1-5.0	33	31	26	32	33	93.9	78.8	97.0	100.0
5.1-11.0	25	20	17	23	25	80.0	68.0	92.0	100.0
Pathology pattern	64	52	59	46	46	81.2	92.2	71.9	71.9
Massive type	38	32	38	27	27	84.2	100.0	71.1	71.1
Ulcerous type	5	4	4	3	4	80.0	80.0	60.0	80.0
Infiltrative type	13	11	12	11	12	84.6	92.3	84.6	92.3
Ulc and inf type	8	5	5	5	3	62.5	62.5	62.5	37.5

S & p c = Surgery and pathology case, Circumf = Circumferential, circum = circumference, Ulc and inf = Ulcerous and infiltrative. For circum-ferential extent, comparison between MPR and VC, U = 3.472, P < 0.001; comparison between VC and SSD, U = 0.449, P > 0.05; comparison between SSD and Raysum, U = 0.000, P > 0.05. For Lesion length, comparison between MPR and VC, U = 1.875, P > 0.05; comparison between VC and SSD, U = 3.034, P < 0.05; comparison between SSD and Raysum U = 1.759, P > 0.05. For pathologic pattern, compari-son between MPR and VC, U = 1.817, P > 0.05; comparison between VC and SSD, U = 2.991, P < 0.05; comparison between SSD and Raysum, U = 0.000, P > 0.05.

Table 2 Diagnosis accordance of 64 colorectal carcinomas with postprocessing techniques

Postprocessing technique	Circumferential extent		Lesion length		Pathological pattern
	Case (n)	%	Case (n)	%	Case (n)	%
MPR	64	100.0	57	89.1	52	81.2
VC	53	82.8	49	76.6	59	92.2
SSD	51	79.7	61	95.3	46	71.9
Raysum	51	79.7	64	100.0	46	71.9
χ2 value	14.748b		22.430b		10.909a

^aP < 0.05 vs pathological pattern,

^bP < 0.01 vs circumferential extent and lesion length.