CAJ | 학술논문

目的：通过动态心脏和冠状动脉体模，评价高清扫描（HD）和能谱成像（GSI）对冠状动脉支架内径的显示能力。方法将5支不同规格的冠状动脉支架置于心脏动态体模（心率设定为60次/min）制成冠状动脉支架模型。分别进行HD、GSI和标准（S）扫描3种冠状动脉CT造影（CCTA）扫描方式。数据传输至AW工作站，分别对HD图像、60～140 keV的9组单能量图像和S图像进行后处理和指标测量，包括信噪比（SNR）、对比噪声比（CNR）、支架内径显示值和显示率。比较3种扫描模式的差别和一致性。结果3种扫描模式的SNR值存在差别（P<0.05），而CNR值的差别则无统计学意义（P>0.05）。HD的支架内径显示率（0.85±0.06）明显高于其他2种扫描模式（GSI为0.40±0.16、0.48±0.13、0.50±0.14、0.51±0.13、0.45±0.05、0.52±0.13、0.53±0.13、0.53±0.13、0.53±0.13，S为0.53±0.14，均P<0.05）。HD扫描模式的内径最接近支架实际的内径。结论心率60次/min时，3种扫描模式客观评价图像质量无明显差别；HD模式对于支架的内径显示率明显高于GSI和S模式，其结果与支架实际内径之间具有更好的一致性。
목적：통과동태심장화관상동맥체모，평개고청소묘（HD）화능보성상（GSI）대관상동맥지가내경적현시능력。방법장5지불동규격적관상동맥지가치우심장동태체모（심솔설정위60차/min）제성관상동맥지가모형。분별진행HD、GSI화표준（S）소묘3충관상동맥CT조영（CCTA）소묘방식。수거전수지AW공작참，분별대HD도상、60～140 keV적9조단능량도상화S도상진행후처리화지표측량，포괄신조비（SNR）、대비조성비（CNR）、지가내경현시치화현시솔。비교3충소묘모식적차별화일치성。결과3충소묘모식적SNR치존재차별（P<0.05），이CNR치적차별칙무통계학의의（P>0.05）。HD적지가내경현시솔（0.85±0.06）명현고우기타2충소묘모식（GSI위0.40±0.16、0.48±0.13、0.50±0.14、0.51±0.13、0.45±0.05、0.52±0.13、0.53±0.13、0.53±0.13、0.53±0.13，S위0.53±0.14，균P<0.05）。HD소묘모식적내경최접근지가실제적내경。결론심솔60차/min시，3충소묘모식객관평개도상질량무명현차별；HD모식대우지가적내경현시솔명현고우GSI화S모식，기결과여지가실제내경지간구유경호적일치성。
Objective To compare the displayed inner diameter of coronary stent by high definition(HD)and gem?stone spectral imaging(GSI)using dynamic cardiac and coronary artery phantom. Methods Five different types of coro?nary stents(internal diameter, 3.10 mm±0.55 mm;strut thickness, 0.12 mm±0.04 mm)were placed into a pulsating cardiac phantom(ALPHA 1-VT PC, Fuyo Corporation, Japan). The stent phantom was scanned by 3 systems, gemstone spectral im?aging(GSI), spiral scan(S)and HD. All the spectral imaging data were analyzed using GSI viewer to reconstruct the VMS (monochromic spectral) images(60-140 keV). Image noise(N), signal-to-noise ratio(SNR), contrast-to-noise ratio(CNR) and inner diameter were compared between images acquired through these 3 systems. Results SNRs in images of S and HD were higher than that of GSI(P<0.05),while there were no significant differences in CNRs among images of GSI, S and HD(P>0.05). The visible diameter(%)measurements of HD(0.85 ± 0.06)was significant higher than that of the other 2 scan systems and most close to the width of those stent’s actual size.(GSI:0.40±0.16, 0.48±0.13, 0.50±0.14, 0.51±0.13, 0.45±0.05,0.52±0.13, 0.53±0.13, 0.53±0.13, 0.53±0.13, S:0.53±0.14, P<0.05). Conclusion There was no significant dif?ferences in image quality among the images acquired by these 3 systems when the heart rate was set to 60 beats per min. Comparing to GSI and S, HD can produce best represent images to the known inner diameter of coronary stent.