Detection rates, sensitivity, and specificity of multislice spiral computed tomography, 1.5T and 3.0T magnetic resonance imaging in anal fistula diagnosis

doi:10.4240/wjgs.v18.i4.115864

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World Journal of Gastrointestinal Surgery

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1948-9366

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Baishideng Publishing Group Inc, 7041 Koll Center Parkway, Suite 160, Pleasanton, CA 94566, USA

Retrospective Study

Copyright: ©Author(s) 2026. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial (CC BY-NC 4.0) license. No commercial re-use. See permissions. Published by Baishideng Publishing Group Inc.

World J Gastrointest Surg. Apr 27, 2026; 18(4): 115864
Published online Apr 27, 2026. doi: 10.4240/wjgs.v18.i4.115864

Table 1 Comparison of sequence parameters between 1.5T magnetic resonance imaging and 3.0T magnetic resonance imaging

Parameter	Sequence	1.5T MRI	3.0T MRI
TR (milliseconds)	Sagittal T2WI	4000	6000
	Coronal T2WI	4050	6500
	Axial T2WI	4400	6700
	Axial T1WI	680	600
	Axial T2WI FS	5500	8500
TE (milliseconds)	Sagittal T2WI	120	100
	Coronal T2WI	80	102
	Axial T2WI	100	102
	Axial T1WI	16	20
	Axial T2WI FS	90	110
FOV (mm)	Sagittal T2WI	280 × 280	300 × 300
	Coronal T2WI	280 × 320	240 × 240
	Axial T2WI	240 × 300	240 × 240
	Axial T1WI	280 × 280	240 × 240
	Axial T2WI FS	280 × 300	240 × 240
Slice thickness (mm)	Sagittal T2WI	4.0	4.0
	Coronal T2WI	4.0	3.5
	Axial T2WI	4.0	3.5
	Axial T1WI	4.0	4.0
	Axial T2WI FS	4.0	3.5
Inter-slice gap (mm)	Sagittal T2WI	1.0	0.4
	Coronal T2WI	1.0	0.4
	Axial T2WI	1.0	0.4
	Axial T1WI	1.0	0.35
	Axial T2WI FS	1.0	0.35
Number of slices	All sequences	24	25

TR: Repetition time; TE: Echo time; FOV: Field of view; T2WI: T2-weighted imaging; FS: Fat suppression; MRI: Magnetic resonance imaging.

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Table 2 Comparison of general characteristics among three patient groups, mean ± SD

Parameter	MSCT group	1.5T MRI group	3.0T MRI group	F/χ²	P value
Sex (male/female)	15/10	27/18	38/11	χ² = 1.321	0.517
Age (years)	39.63 ± 6.87	40.15 ± 7.59	37.87 ± 8.25	F = 0.952	0.389
Disease duration (months)	9.86 ± 2.57	10.13 ± 2.65	9.39 ± 2.34	F = 0.838	0.435
BMI (kg/m²)	24.52 ± 3.04	24.11 ± 2.78	23.96 ± 3.17	F = 0.369	0.693

BMI: Body mass index; MSCT: Multislice spiral computed tomography; MRI: Magnetic resonance imaging.

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Table 3 Comparison of diagnostic and surgical outcomes between multislice spiral computed tomography, 1.5T magnetic resonance imaging, and 3.0T magnetic resonance imaging

Methods	Items	Preoperative diagnosis				Detection rate	Surgical outcome	K
Methods	Items	True positive	False positive	False negative	True negative	Detection rate	Surgical outcome	K
MSCT	Internal opening	23	5	2	13	76.67 (23/30)	27	0.681
	Primary fistula	24	5	2	14	77.42 (24/31)	27	0.711
	Abscess	8	1	1	3	80.00 (8/10)	8	0.845
1.5T MRI	Internal opening	39	7	4	22	78.00 (39/50)	46	0.694
	Primary fistula	40	7	2	21	81.63 (40/49)	47	0.726
	Abscess	14	2	0	8	87.50 (14/16)	14	0.851
3.0T MRI	Internal opening	52	2	1	25	94.54 (52/55)^a	52	0.911^a
	Primary fistula	54	1	1	24	96.43 (54/56)^a	55	0.926^a
	Abscess	17	1	0	24	94.45 (17/18)	17	0.906

^aP < 0.05 vs multislice spiral computed tomography and 1.5T magnetic resonance imaging.

MSCT: Multislice spiral computed tomography; MRI: Magnetic resonance imaging.

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Table 4 Diagnostic performance of multislice spiral computed tomography, 1.5T magnetic resonance imaging, and 3.0T magnetic resonance imaging

Modality	Finding	Sensitivity	Specificity	PPV	NPV	Diagnostic accuracy	Youden index
MSCT	Internal opening	92.00% (23/25)	72.22% (13/18)	82.14% (23/28)	86.67% (13/15)	83.72% (36/43)	0.64
	Primary tract	92.30% (24/26)	73.68% (14/19)	82.76% (24/29)	87.50% (14/16)	84.44% (38/45)	0.66
	Abscess	88.89% (8/9)	75.00% (3/4)	88.89% (8/9)	75.00% (3/4)	84.61% (11/13)	0.69
1.5T MRI	Internal opening	90.69% (39/43)	75.86% (22/29)	84.78% (39/46)	84.62% (22/26)	84.72% (61/72)	0.67
	Primary tract	95.24% (40/42)	75.00% (21/28)	85.11% (40/47)	91.30% (21/23)	87.14% (61/70)	0.7
	Abscess	100.00% (14/14)	80.00% (8/10)	87.50% (14/16)	100.00% (8/8)	91.67% (22/24)	0.8
3.0T MRI	Internal opening	98.11% (52/53)^a	92.59% (25/27)^a	96.30% (52/54)^a	96.15% (25/26)^a	96.25% (77/80)^a	0.91^a
	Primary tract	98.18% (54/55)^a	96.00% (24/25)^a	98.18% (54/55)^a	96.00% (24/25)^a	97.50% (78/80)^a	0.94^a
	Abscess	100.00% (17/17)	96.00% (24/25)^a	94.44% (17/18)^a	100.00% (24/24)	97.62% (41/42)	0.96^a

^aP < 0.05 vs multislice spiral computed tomography and 1.5T magnetic resonance imaging.

MSCT: Multislice spiral computed tomography; MRI: Magnetic resonance imaging; PPV: Positive predictive value; NPV: Negative predictive value.

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Citation: Tang JJ, Wang TH, Jia XF. Detection rates, sensitivity, and specificity of multislice spiral computed tomography, 1.5T and 3.0T magnetic resonance imaging in anal fistula diagnosis. World J Gastrointest Surg 2026; 18(4): 115864
URL: https://www.wjgnet.com/1948-9366/full/v18/i4/115864.htm
DOI: https://dx.doi.org/10.4240/wjgs.v18.i4.115864