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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(P<0.01)。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。
Objective To explore the feasibility of using Care Dose 4D and Care k V to reduce the radiation dose of deep venous and pulmonary CT angiography. Methods Totally 200 cases of lower extremity deep vein CT angiography due to deep venous thrombosis or pulmonary embolism in lower extremities were collected. All patients underwent double-limb CT examination of the entire lower extremity to pulmonary artery. Image post-processing was performed on a Siemens Syngo via workstation, including maximum density projection, multiplanar reconstruction and volume reconstruction. The deep venous thrombosis, pulmonary embolism, vascular variation and related vascular lesions of lower extremities were judged and recorded. Group A (n = 100) Patients using the technique without Care Dose 4D and Care k V and Group B (100 patients) compared the difference in dose between groups A and B. Results CTV examination of lower extremity deep venous showed that pulmonary embolism was found in 43 cases, of which 39 cases were complicated with deep vein thrombosis, 87 cases with deep vein thrombosis, 20 cases with Cockett syndrome, 6 cases with Budd-chiari syndrome, 35 cases with vascular variation and collateral circulation , Venous pressure in 9 cases. The mean effective radiation dose in group B [(491.5 ± 156) m Gy / cm] was significantly lower than that in group A [(1164 ± 451) m Gy / cm] (P <0.01). Conclusion The application of automatic radiation dose adjustment technique (Care Dose 4D and Care k V) in deep venous and pulmonary artery imaging of both lower extremities can significantly reduce the radiation dose while ensuring the deep venous thrombosis, pulmonary embolism and associated collateral circulation in the lower extremities. .