ISSN 1004-4140
CN 11-3017/P
季文超, 田蔚莉, 刘文亚, 等. 佳能320可变螺距联合迭代重建技术在双下肢CTA血管成像中的运用研究[J]. CT理论与应用研究(中英文), xxxx, x(x): 1-7. DOI: 10.15953/j.ctta.2024.009.
引用本文: 季文超, 田蔚莉, 刘文亚, 等. 佳能320可变螺距联合迭代重建技术在双下肢CTA血管成像中的运用研究[J]. CT理论与应用研究(中英文), xxxx, x(x): 1-7. DOI: 10.15953/j.ctta.2024.009.
JI W C, TIAN W L, LIU W Y, et al. Application of the Canon 320 Row Variable Helical Pitch CTA System Combined with Iterative Reconstruction Technology for Lower Limb Vascular Imaging[J]. CT Theory and Applications, xxxx, x(x): 1-7. DOI: 10.15953/j.ctta.2024.009. (in Chinese).
Citation: JI W C, TIAN W L, LIU W Y, et al. Application of the Canon 320 Row Variable Helical Pitch CTA System Combined with Iterative Reconstruction Technology for Lower Limb Vascular Imaging[J]. CT Theory and Applications, xxxx, x(x): 1-7. DOI: 10.15953/j.ctta.2024.009. (in Chinese).

佳能320可变螺距联合迭代重建技术在双下肢CTA血管成像中的运用研究

Application of the Canon 320 Row Variable Helical Pitch CTA System Combined with Iterative Reconstruction Technology for Lower Limb Vascular Imaging

  • 摘要: 目的:探讨佳能320排CT可变螺距联合迭代重建技术在下肢血管成像中,辐射剂量的变化及对图像质量的影响。方法:连续收集2023年3月至2023年6月就诊的临床疑似下肢动脉血管疾病,并行下肢动脉CT血管成像的患者40例,经由双盲随机分组法归入A组和B组,每组20例。两组均采用造影剂碘帕醇370 mg/mL,设置成120 kV的管电压,借助双筒高压注射器在5 mL/s流率下,经由肘正中静脉(MCV)注入90 mL对比剂,扫描区域是腹主动脉(AA)水平到足尖。其中A组为佳能320排可变螺距技术(VHP)其中腹主动脉至腘窝使用大螺距,腘窝至足跟尖使用小螺距进行扫,采用迭代重建技术重建图像;B组全程扫描使用标准螺距技术,采用滤波反投影法重建图像。比较两组AA、髂总动脉(CIA)、股动脉(CFA)上段、腘动脉4个测量点的主观图像质量、信噪比(SNR)、碘(造影剂)摄入量、对比SNR(CNR)、有效辐射剂量与CT值状况。经由t检验来对比两组间碘摄入量、有效辐射剂量与客观评价指标,经由Mann-Whitney U检验来对比双方主观评分。结果:两组图像在AA、CIA、股动脉上段、腘动脉层面的客观图像质量评价、SNR、CNR对比未见明显区别。两组间血管CT值比较,A组高于B组,并且存在统计学差异。患者辐射剂量比较,A组(9.18±0.36)mGy较B组(18.1±0.00)mGy为显著下调表现。结论:佳能320排可变螺距联合迭代重建技术能够保证图像的质量,并且可使患者的辐射剂量大幅下降,提高了安全性,可以在临床中得到广泛应用。

     

    Abstract: Objectives: To investigate the image quality obtained using the Canon 320 row variable helical pitch (vHP) computed tomography (CT) system combined with iterative reconstruction technology for lower limb angiography and the radiation exposure to patients. Methods: From March 2023 to June 2023, we enrolled 40 patients who were treated at our hospital for suspected arterial vascular disease of the lower limbs. The patients, who all underwent CT angiography of the lower limb arteries, were divided into two groups (A and B; 20 patients/group) through double-blind random grouping. Both groups were treated with 370 mg/ml of the contrast agent iodoparol at a tube voltage of 120 kV. A dual-cylinder high-pressure syringe was used to inject 90 ml of the contrast agent into the median elbow vein at a flow rate of 5 ml/s. The scanning range extended from the level of the abdominal aorta to the toe. For Group A, the Canon 320 row vHP system was used, with a large pitch from the abdominal aorta to the popliteal fossa and a small pitch from the popliteal fossa to the tip of the heel. The images were reconstructed using iterative reconstruction technology. For Group B, conventional pitch technology was used for full scanning and the Filtered BackProjection method for image reconstruction. The subjective image quality, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), CT value, effective radiation exposure, and contrast medium iodine intake at four measuring points of the abdominal aorta and common iliac, upper femoral, and popliteal arteries were compared between the two groups. The t-test was used to compare the objective evaluation index, effective radiation exposure, and contrast agent iodine intake values between the two groups, whereas the Mann-Whitney U test was used to compare the subjective scores. Results: There were no significant differences between the two groups in terms of objectively evaluated image quality, SNR, and CNR of the abdominal aorta and common iliac, upper femoral, and popliteal arteries. Group A had significantly higher vascular CT values than Group B. Moreover, the patients in Group A were significantly less exposed to radiation (9.18 ± 0.36) mGy than those in Group B were (18.1 ± 0.00) mGy. Conclusion: The Canon 320 row vHP system combined with iterative reconstruction technology ensured good image quality and significantly reduced patient exposure to radiation, thereby improving the safety of CTA, and can be widely used in clinical practice.

     

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