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KMID : 1131320140160020129
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Journal of Korean Society of Computed Tomographic Technology
2014 Volume.16 No. 2 p.129 ~ p.138
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Optimization study of CT brain angiography for discovery of CT restenosis of intracranial stent(Phantom study)
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Lee Seong-Hyeon
Lee Hyun-Woo
Na Jung-Ju
Kim Chang-Nam
Kim Ki-Won
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Abstract
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Purpose : To study various scan conditions to facilitate the inspection of restenosis using the follow up of CT brain angiography of patient with stent inserted in intracraniuml.
Material and Methods : Aquillion One of as CT scanner was used and parameters of a tube current (200,250,300 mAs) a tube voltage (80, 100, 120, 135 kVp) was applied to the PH-3 Angiographic CT Head Phantom with wingspan 3 mm stent inserted in intracranial MCA (Middle Cerebral Artery) M2. FBP (Filtered Back Projection), IR (Iterative Reconstruction) of the STD (Standard) and STR (Strong) by changing the scan as reconstruction algorithms were used. Stent were compared by dividing cases between parallel to the X axis and the Z axis of Gantry. qualitative analysis and quantitative analysis about image evaluation was performed, divided in parts to non stenosis and parts to 50% stenosis in stent. Qualitative analysis using PACS was performed by four three radiological technologists. Quantitative analysis was performed, with HU value measured in parts to non stenosis and parts stenosis with ROI drawn 3 times. Statistical evaluation was performed by Origin and Sigmaplot, about reproducibility of parts to non stenosis and parts stenosis, the relationship between X-ray beam and the direction of the stent and the relationship between dose and image quality.
Results : Measured data were confirmed that the it was normal distribution through Shapiro-Wilk Test. Statistical evaluation by Sigmaplot was adopted at the significance level of the null hypothesis 5% that image quality about case of parallel to X-axis is superior than that of the parallel to Z-axis. The algorithm-specific assessment showed the non-stenosis Recon FBP (P <0.0001), STD (P <0.0001), STR (P <0.0001), stenosis FBP (P = 0.000127), STD (P = 0.000236), STR (P = 0.0001) about case of parallel to X-axis. Thus, AIDR 3D STR of IR Recons process was useful for the discovery of stenosis and conditions (kVp, mAs, DLP) for a minimum dose were 100 kVp, 300 mAs, 621.8 mGyㆍ㎝, respectively.
Conclusion : In follow-up inspection after stent inserted, if parameters in case of the parallel to X-axis are 100 kVp, 300 mAs and STR of the IR reconstruction, parameters in case of the parallel to z-axis are 120 kVp, 200 mAs dose and FBP reconstruction (p <0.0001), low dose and high quality of image can be obtained and tracking of restenosis will be facilitated.
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KEYWORD
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CT Brain angiography, Restenosis, Intracranial Stent
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