降低下肢深静脉及肺动脉CT血管成像辐射剂量的CARE DOSE 4D及CARE kV技术探讨

发布时间：2019-06-10 21:51

【摘要】：目的探讨应用Care Dose 4D及Care k V技术降低下肢深静脉及肺动脉CT血管成像辐射剂量的可行性。方法搜集因下肢深静脉血栓或肺动脉栓塞在行下肢深静脉CT血管成像检查者200例,全部患者均在双源CT上完成双下肢至肺动脉全程血管的检查。图像后处理在Siemens Syngo via工作站完成,包括最大密度投影、多平面重组和容积再现法重建,判断并记录下肢深静脉血栓、肺栓塞、血管变异以及相关血管病变情况,其中A组(100例)患者未采用Care Dose 4D及Care k V技术与B组(100例)患者使用该技术,比较A组与B组辐射剂量之间的差异。结果下肢深静脉CTV检查显示肺动脉栓塞43例,其中伴发深静脉血栓39例,下肢深静脉血栓87例,Cockett综合征20例,布加综合征6例,血管变异与侧支循环开放35例,静脉受压9例。B组平均有效辐射剂量[(491.5±156)m Gy/cm]较A组平均有效辐射剂量[(1164±451)m Gy/cm]显著降低(P0.01)。结论采用自动辐射剂量调整技术(Care Dose 4D和Care k V)行双下肢深静脉及肺动脉血管成像可在保证清晰显示下肢深静脉血栓、肺动脉栓塞及伴发侧支循环的同时,显著降低辐射剂量。
[Abstract]:Objective to investigate the feasibility of using Care Dose 4D and Care k V to reduce the radiation dose of CT angiography in deep vein and pulmonary artery of lower extremity. Methods CT angiography of deep vein of lower extremity was performed in 200 patients with deep venous thrombosis or pulmonary embolism of lower extremity. All patients were examined from lower extremity to pulmonary artery on dual-source CT. Image post-processing was performed on Siemens Syngo via workstation, including maximum density projection, multiplanar reconstruction and volume reconstruction, to judge and record deep venous thrombosis, pulmonary embolism, vascular variation and related vascular lesions in the lower extremities. Care Dose 4D and Care k V techniques were not used in group A (n = 100) and group B (n = 100). The difference of radiation dose between group A and group B was compared. Results CTV examination of deep vein of lower extremity showed pulmonary embolism in 43 cases, including 39 cases of deep venous thrombosis, 87 cases of deep venous thrombosis of lower extremity, 20 cases of Cockett syndrome, 6 cases of Budd-Chiari syndrome, 35 cases of vascular variation and collateral circulation opening. The average effective radiation dose in group B [(491.5 卤156m Gy/cm] was significantly lower than that in group A [(1164 卤451m Gy/cm]) (P 0.01). Conclusion the application of automatic radiation dose adjustment technique (Care Dose 4D and Care k V) in deep vein and pulmonary artery angiography of both lower extremities can ensure the clear display of deep venous thrombosis, pulmonary embolism and collateral circulation in lower extremities. The radiation dose was significantly reduced.
【作者单位】：中南大学湘雅医学院附属海口医院放射科;中南大学湘雅医学院附属海口医院血管外科;
【分类号】：R816.2

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