Role of WARP sequence magnetic resonance imaging with the removal of metal artifacts in the evaluation of lumbar adjacent

Table 1 Magnetic resonance imaging parameters of conventional T2FS and WARP T2-STIR sequences in the sagittal plane and cross-sections of patients

Items	Sagittal plane T2WI fs	Sagittal plane T2-STIR WARP	Transverse section T2WI	Transverse section T2-WARP
TR (ms)	3770	2330	2880	2160
TE (ms)	95	33	94	106
FOV (mm × mm)	320 × 320	320 × 320	180 × 180	180 × 180
Thickness (mm)	3	3	4	4
Interlamellar spacing (mm)	1	1	0.4	0.4
Matrix	320 × 320	320 × 320	180 × 180	180 × 180
Band width	260	601	250	601

TR: Repetition time; TE: Echo time; FOV: Field of view.

Table 2 Comparison of metal artifact areas between the two groups

Grouping	Sagittal plane (cm2)	Transverse section (cm2)
WARP group	20.85 ± 6.27	23.02 ± 6.00
Control group	50.56 ± 8.55	24.61 ± 4.37
t	18.20	21.00
P value	< 0.01	< 0.01

Table 3 Intergroup comparison of the visibility evaluation of the surrounding anatomical structure of the implant

Grouping	Ver vertebral body	Vertebral pedicle	Intervertebral nerve foramen	Nerve root
WARP group	3.03 ± 0.67	1.97 ± 0.56	3.63 ± 0.61	2.80 ± 0.48
Control group	1.87 ± 0.63	0.73 ± 0.58	3.00 ± 0.45	2.10 ± 0.48
t	24.85	19.37	32.36	31.671
P value	< 0.001	< 0.001	< 0.001	< 0.001

Table 4 Comparison between groups in the assessment of adjacent vertebral disease

Grouping	Canalis spinalis	Herniation of the nucleus pulposus
WARP group	4.33 ± 0.55	4.67 ± 0.48
Control group	2.30 ± 0.75	2.33 ± 0.96
t	43.42	53.31
P value	< 0.001	< 0.001