本文選題：體層攝影術(shù)　切入點(diǎn)：X線計(jì)算機(jī)　出處：《中國醫(yī)學(xué)影像技術(shù)》2017年02期

【摘要】：目的探討濾波反投影(FBP)、混合迭代重建(iDose~4)和基于模型的迭代重建(IMR)技術(shù)對低劑量雙下肢CTA圖像質(zhì)量的影響。方法對56例成年患者行雙下肢CTA掃描,分別用FBP、iDose~4和IMR方法重建,測量下肢各段血管(腹主動(dòng)脈分叉處、髂總動(dòng)脈分叉處、股動(dòng)脈近端、股動(dòng)脈中段和乆動(dòng)脈近端)的CT值、圖像噪聲及對比噪聲比(CNR),并采用4分法對3組圖像質(zhì)量分別進(jìn)行主觀評分。結(jié)果 FBP、iDose~4和IMR重建圖像的下肢各段血管平均CT值分別為(511.07±195.05)HU、(492.63±178.74)HU、(487.63±197.20)HU,三者間差異無統(tǒng)計(jì)學(xué)意義(F=1.175,P0.05)。圖像噪聲分別為(76.24±20.85)HU、(39.16±11.75)HU、(13.09±2.55)HU,三者間差異有統(tǒng)計(jì)學(xué)意義(F=1 460.000,P0.05)。CNR分別為6.35±3.14、12.97±5.10、33.83±15.85,三者間差異有統(tǒng)計(jì)學(xué)意義(F=646.122,P0.05)。圖像質(zhì)量主觀評分IMR(3.75±0.46)、FBP(1.39±0.51)、iDose~4(2.61±0.81)差異有統(tǒng)計(jì)學(xué)意義(χ2=476.79,P0.05),膝關(guān)節(jié)以上、下段動(dòng)脈可診斷率IMR(98.66%)明顯高于FBP(1.34%)、iDose~4(56.70%),差異均有統(tǒng)計(jì)學(xué)意義(χ2=427.9,P0.05)。結(jié)論行低輻射劑量雙下肢CTA掃描時(shí),相比FBP和iDose~4,IMR可以顯著降低圖像噪聲,提高圖像質(zhì)量,且能滿足診斷要求。
[Abstract]:Objective to investigate the effects of filtered backprojection (FBP), mixed iterative reconstruction (IMR) and model-based iterative reconstruction (IMR) on the quality of low dose CTA images of lower extremities. Methods 56 adult patients were scanned with CTA of both lower extremities and reconstructed by FBPX iDose4 and IMR respectively. Ct values of lower extremity blood vessels (abdominal aorta bifurcation, common iliac artery bifurcation, proximal femoral artery, middle femoral artery and proximal femoral artery) were measured. The image noise and contrast noise ratio were compared. The image quality of the three groups was evaluated by the method of 4 points. Results the average CT values of the lower extremity vessels in the reconstructed images of IMR and FBP were 492.63 鹵178.74HUA 487.63 鹵1977.63 鹵197.20HUU, respectively. There was no significant difference among the three groups. The image noise was 76.24 鹵20.85hou (39.16 鹵11.75hou) 13.09 鹵2.55Hu, and the difference among them was statistically significant (6.35 鹵3.146.97 鹵5.10v 33.83 鹵15.85, respectively). The subjective score of image quality was 1.39 鹵0.561 鹵0.51% (蠂 2 476.79), the difference was statistically significant (蠂 2 476.79), the knee joint was above 0. 05% (蠂 2 476.79), and there was a significant difference among them (蠂 2 476.79%, P 0. 05 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05, P 0. 05). The diagnostic rate of lower segmental artery was significantly higher than that of FBP 1.34 and iDose 46.70. The difference was statistically significant (蠂 2 / 427.9 / P 0.05N). Conclusion compared with FBP and iDose 4IMR, low radiation dose CTA can significantly reduce image noise, improve image quality and meet the diagnostic requirements.
【作者單位】： 南京醫(yī)科大學(xué)附屬蘇州醫(yī)院放射科;
【分類號】：R816.2

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本文編號：1655093