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.