Quality evaluation of non-rigid subtraction technique in CT dynamic enhancement scanning of liver

doi:10.3877/cma.j.issn.1674-0793.2019.06.009

Abstract

Abstract:

Objective

To evaluate the quality of non-rigid subtraction technique in CT dynamic enhancement scanning of liver.

Methods

The image data of fifty patients undergoing CT dynamic enhancement scanning of liver were retrospectively collected from December 2018 to February 2019 in the First Affiliated Hospital of Sun Yat-sen University. The subtraction images were obtained by non-rigid subtraction technique. The image quality before and after subtraction was evaluated. Qualitative evaluation included image artifacts and anatomical mismatch degree. The CT value of each blood vessel (abdominal aorta, right hepatic artery, left hepatic artery, portal vein trunk, right portal vein branch, and left portal vein branch) before and after the subtraction were measured quantitatively in the arterial and portal vein phases, mixed linear effect model and fitting equation were used to evaluate the fitting degree of CT value curve of each blood vessel before and after subtraction.

Results

There were no obvious artifacts caused by anatomical mismatch of the images after non-rigid subtraction, and the consistency of three surveyors was high (ICC=0.844,P<0.001). Subtraction technique could reduce the CT value of each blood vessel to a certain extent, and there was no interaction with enhancement phase. The CT values of each blood vessel before and after subtraction showed the same trend in both late arteries and the CT value curve was consistent.

Conclusion

Non-rigid subtraction technique can be applied to CT dynamic enhancement scanning of liver to obtain high quality images.

Key words: Tomography, spiral computed, Image enhancement, Subtraction technique, Liver

Zi Yan, Huasong Cai, Manshi Hu, Liqin Wang, Shiting Feng, Meng Wang. Quality evaluation of non-rigid subtraction technique in CT dynamic enhancement scanning of liver[J]. Chinese Archives of General Surgery(Electronic Edition), 2019, 13(06): 459-462.

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URL: https://zhptwkxwx.cma-cmc.com.cn/EN/10.3877/cma.j.issn.1674-0793.2019.06.009

https://zhptwkxwx.cma-cmc.com.cn/EN/Y2019/V13/I06/459

Figures/Tables 5

References 15

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测量者	1级	2级	3级	4级	5级
1	0(0)	0(0)	2(4.0)	27(54.0)	21(42.0)
2	0(0)	0(0)	1(2.0)	16(32.0)	33(66.0)
3	0(0)	0(0)	0(0)	12(24.0)	38(76.0)

测量者	1级	2级	3级	4级	5级
1	0(0)	0(0)	2(4.0)	27(54.0)	21(42.0)
2	0(0)	0(0)	1(2.0)	16(32.0)	33(66.0)
3	0(0)	0(0)	0(0)	12(24.0)	38(76.0)

供血血管	平扫	动脉晚期		门静脉晚期		减影		分期		减影×分期
供血血管	平扫	减影前	减影后	减影前	减影后	F值	P值	F值	P值	F值	P值
腹主动脉	44.82±3.68	261.12±51.19	224.14±50.00	158.56±24.84	122.30±24.18	60.45	<0.001	464.98	<0.001	0.01	0.92
肝右动脉	44.41±5.09	236.63±44.78	208.81±45.95	144.56±25.73	120.75±25.86	32.94	<0.001	360.63	<0.001	0.34	0.56
肝左动脉	44.48±4.39	241.80±44.37	215.44±47.59	146.76±24.72	120.19±25.11	27.54	<0.001	358.12	<0.001	0	0.98
门静脉主干	44.05±2.49	171.36±45.15	141.71±43.89	165.45±28.20	130.12±26.41	55.44	<0.001	2.21	0.14	1.02	0.32
门静脉右支	45.16±2.40	171.36±43.75	141.62±43.79	165.56±28.00	130.39±25.96	57.71	<0.001	2.19	0.14	0.96	0.33
门静脉左支	44.87±2.95	168.16±44.45	138.02±42.80	165.54±27.70	129.77±25.44	56.45	<0.001	0.42	0.52	0.98	0.32

供血血管	平扫	动脉晚期		门静脉晚期		减影		分期		减影×分期
供血血管	平扫	减影前	减影后	减影前	减影后	F值	P值	F值	P值	F值	P值
腹主动脉	44.82±3.68	261.12±51.19	224.14±50.00	158.56±24.84	122.30±24.18	60.45	<0.001	464.98	<0.001	0.01	0.92
肝右动脉	44.41±5.09	236.63±44.78	208.81±45.95	144.56±25.73	120.75±25.86	32.94	<0.001	360.63	<0.001	0.34	0.56
肝左动脉	44.48±4.39	241.80±44.37	215.44±47.59	146.76±24.72	120.19±25.11	27.54	<0.001	358.12	<0.001	0	0.98
门静脉主干	44.05±2.49	171.36±45.15	141.71±43.89	165.45±28.20	130.12±26.41	55.44	<0.001	2.21	0.14	1.02	0.32
门静脉右支	45.16±2.40	171.36±43.75	141.62±43.79	165.56±28.00	130.39±25.96	57.71	<0.001	2.19	0.14	0.96	0.33
门静脉左支	44.87±2.95	168.16±44.45	138.02±42.80	165.54±27.70	129.77±25.44	56.45	<0.001	0.42	0.52	0.98	0.32

分期		线性方程	决定系数	P值	斜率	斜率的95%CI
动脉晚期		?	?	?	?	?
?	减影前	y= -20.9x+281.51	0.36	<0.001	-20.9	-24.1~-17.7
?	减影后	y= -20.2x+248.88	0.34	<0.001	-20.2	-23.4 ~-17.0
门静脉晚期		?	?	?	?	?
?	减影前	y= -3.3x+146.10	0.04	<0.001	-3.3	-1.5~-5.2
?	减影后	y= -2.2x+118.00	0.02	0.011	-2.2	-0.5~-3.9

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