Application study of dual-layer spectral detector CT in intracranial angiography

doi:10.3877/cma.j.issn.2095-123X.2022.02.009

Abstract

Abstract:

Objective

To compare the image quality between virtual mono-energetic images (VMIs) with different keV and conventional images in intracranial CT angiography (CTA) using dual-layer spectral detector CT (SDCT).

Methods

The clinical and imaging data of 80 patients who underwent intracranial CTA utilizing the SDCT in Radiology Department of Beijing Tiantan Hospital, Capital Medical University from April 2020 to March 2021 were retrospectively analyzed. CT values of the intracranial arteries, their contrast to noise ratio (CNR) compared to the corpus callosum, overall image quality, and difficulty degree of volume rendering (VR) for the intracranial artery were compared between the VMIs (40-90 keV, interval of 10 keV) and the conventional images. Friedman test was used for the statistical analysis.

Results

With the decrease of the energy level (from 90 keV to 40 keV), CT values of the arteries increased significantly (C7 segment of the internal carotid artery: 242.16-1090.28 HU; the basilar artery: 217.17-1021.79 HU), while CT value of the corpus callosum increased slightly (29.30-37.76 HU). Performance of the CNR and the overall image quality on the lower-energy (40-60 keV) images were significantly better than those on the conventional images (P<0.05), meanwhile, VR of the arteries on the lower-energy (40-60 keV) images was easier than that on the conventional images (P<0.05).

Conclusion

Visualization of the intracranial arteries on the lower-energy (40-60 keV) images was better than that on the conventional images, and VR of the intracranial arteries on the lower-energy (40-60 keV) images was easier than that on the conventional images when utilizing the dual-layer SDCT.

Key words: Computed tomography, Spectral CT, Intracranial angiography, Dual-layer detector, Virtual mono-energetic images

Yong Zhang, Yan Zhang, Jinli Ding, Lei Zhang, Guofeng Ma, Fenglian Zheng, Haikuo Wang, Zhiping Wang, Weibin Gu. Application study of dual-layer spectral detector CT in intracranial angiography[J]. Chinese Journal of Brain Diseases and Rehabilitation(Electronic Edition), 2022, 12(02): 110-114.

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References 15

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位置		CON	40 keV	50 keV	60 keV	70 keV	80 keV	90 keV
颈内动脉C7段	CT值	358.08±72.80	1090.28±227.77	726.65±141.08	515.55±108.10	384.11±74.66	298.35±54.23	242.16±43.56
	Z值		-3.955	-2.955	-1.955	-0.881	1.030	2.030
	P值		<0.001	<0.001	<0.001	0.384	0.122	<0.001
	CNR	56.24±9.90	97.95±13.86	84.70±13.18	73.71±14.15	58.17±10.71	43.83±9.66	35.95±8.63
	Z值		-3.773	-2.773	-1.773	-0.545	1.227	2.227
	P值		<0.001	<0.001	<0.001	>0.999	0.023	<0.001
大脑中动脉M1段	CT值	329.12±63.18	985.43±209.72	657.36±132.62	453.00±89.63	392.40±418.70	260.81±51.12	207.45±37.83
	Z值		-3.750	-2.750	-1.720	-0.606	1.235	2.235
	P值		<0.001	<0.001	<0.001	>0.999	0.022	<0.001
	CNR	53.27±10.80	92.85±15.04	80.61±13.63	67.72±13.05	56.11±10.79	42.83±9.96	34.95±9.23
	Z值		-3.718	-2.718	-1.722	-0.521	1.233	2.233
	P值		<0.001	<0.001	<0.001	>0.999	0.012	<0.001
大脑前动脉A1段	CT值	291.18±60.79	844.34±190.05	575.60±130.46	400.42±90.60	302.27±64.88	231.42±50.53	187.90±39.09
	Z值		-3.712	-2.712	-1.682	-0.439	1.273	2.288
	P值		<0.001	<0.001	<0.001	>0.999	0.015	<0.001
	CNR	49.94±9.56	87.89±13.45	72.47±12.65	61.76±14.63	51.76±10.66	40.97±9.07	32.95±8.68
	Z值		-3.702	-2.702	-1.702	-0.506	1.248	2.261
	P值		<0.001	<0.001	<0.001	>0.999	0.011	<0.001
基底动脉	CT值	329.79±67.10	1021.79±248.51	670.05±162.20	466.28±105.14	343.62±70.15	267.38±55.53	217.17±43.42
	Z值		-3.881	-2.881	-1.866	-0.776	1.134	2.104
	P值		<0.001	<0.001	<0.001	0.079	0.049	<0.001
	CNR	60.64±11.92	105.35±15.83	90.69±13.88	79.45±14.76	62.17±12.61	49.89±12.76	38.75±10.68
	Z值		-3.782	-2.782	-1.783	-0.454	1.211	2.213
	P值		<0.001	<0.001	<0.001	>0.999	0.007	<0.001
大脑后动脉P1段	CT值	276.71±54.42	831.60±186.92	550.07±112.97	379.63±80.88	276.10±65.77	214.93±43.46	171.89±35.53
	Z值		-3.561	-2.591	-1.576	-0.121	1.409	2.409
	P值		<0.001	<0.001	0.001	>0.999	0.004	<0.001
	CNR	45.87±9.81	89.65±12.01	74.13±11.78	60.92±10.80	46.16±9.79	35.86±9.81	24.71±8.70
	Z值		-3.671	-2.671	-1.647	-0.596	1.261	2.283
	P值		<0.001	<0.001	<0.001	>0.999	<0.001	<0.001
胼胝体压部	CT值	30.44±2.06	37.76±6.86	33.27±5.23	31.04±3.75	30.27±2.15	29.65±1.79	29.30±1.26
	Z值		-3.384	-2.233	-0.919	-0.047	0.872	1.070
	P值		<0.001	<0.001	>0.999	>0.999	>0.999	0.455

位置		CON	40 keV	50 keV	60 keV	70 keV	80 keV	90 keV
颈内动脉C7段	CT值	358.08±72.80	1090.28±227.77	726.65±141.08	515.55±108.10	384.11±74.66	298.35±54.23	242.16±43.56
	Z值		-3.955	-2.955	-1.955	-0.881	1.030	2.030
	P值		<0.001	<0.001	<0.001	0.384	0.122	<0.001
	CNR	56.24±9.90	97.95±13.86	84.70±13.18	73.71±14.15	58.17±10.71	43.83±9.66	35.95±8.63
	Z值		-3.773	-2.773	-1.773	-0.545	1.227	2.227
	P值		<0.001	<0.001	<0.001	>0.999	0.023	<0.001
大脑中动脉M1段	CT值	329.12±63.18	985.43±209.72	657.36±132.62	453.00±89.63	392.40±418.70	260.81±51.12	207.45±37.83
	Z值		-3.750	-2.750	-1.720	-0.606	1.235	2.235
	P值		<0.001	<0.001	<0.001	>0.999	0.022	<0.001
	CNR	53.27±10.80	92.85±15.04	80.61±13.63	67.72±13.05	56.11±10.79	42.83±9.96	34.95±9.23
	Z值		-3.718	-2.718	-1.722	-0.521	1.233	2.233
	P值		<0.001	<0.001	<0.001	>0.999	0.012	<0.001
大脑前动脉A1段	CT值	291.18±60.79	844.34±190.05	575.60±130.46	400.42±90.60	302.27±64.88	231.42±50.53	187.90±39.09
	Z值		-3.712	-2.712	-1.682	-0.439	1.273	2.288
	P值		<0.001	<0.001	<0.001	>0.999	0.015	<0.001
	CNR	49.94±9.56	87.89±13.45	72.47±12.65	61.76±14.63	51.76±10.66	40.97±9.07	32.95±8.68
	Z值		-3.702	-2.702	-1.702	-0.506	1.248	2.261
	P值		<0.001	<0.001	<0.001	>0.999	0.011	<0.001
基底动脉	CT值	329.79±67.10	1021.79±248.51	670.05±162.20	466.28±105.14	343.62±70.15	267.38±55.53	217.17±43.42
	Z值		-3.881	-2.881	-1.866	-0.776	1.134	2.104
	P值		<0.001	<0.001	<0.001	0.079	0.049	<0.001
	CNR	60.64±11.92	105.35±15.83	90.69±13.88	79.45±14.76	62.17±12.61	49.89±12.76	38.75±10.68
	Z值		-3.782	-2.782	-1.783	-0.454	1.211	2.213
	P值		<0.001	<0.001	<0.001	>0.999	0.007	<0.001
大脑后动脉P1段	CT值	276.71±54.42	831.60±186.92	550.07±112.97	379.63±80.88	276.10±65.77	214.93±43.46	171.89±35.53
	Z值		-3.561	-2.591	-1.576	-0.121	1.409	2.409
	P值		<0.001	<0.001	0.001	>0.999	0.004	<0.001
	CNR	45.87±9.81	89.65±12.01	74.13±11.78	60.92±10.80	46.16±9.79	35.86±9.81	24.71±8.70
	Z值		-3.671	-2.671	-1.647	-0.596	1.261	2.283
	P值		<0.001	<0.001	<0.001	>0.999	<0.001	<0.001
胼胝体压部	CT值	30.44±2.06	37.76±6.86	33.27±5.23	31.04±3.75	30.27±2.15	29.65±1.79	29.30±1.26
	Z值		-3.384	-2.233	-0.919	-0.047	0.872	1.070
	P值		<0.001	<0.001	>0.999	>0.999	>0.999	0.455

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