平板型数字减影血管造影系统与传统影像增强器系统剂量优化对比研究
发布时间：2019-06-20 04:33
【摘要】：目的 探讨影响平板型数字减影血管造影系统（FPD DSA）成像质量与辐射剂量的因素，并与传统影像增强器型数字减影血管造影系统（TV/II DSA）进行对比，比较两者在成像质量和辐射剂量之间的优劣，提出满足临床要求的剂量优化方案，并对优化方案进行验证。 材料与方法 利用Solidose剂量仪监测DSA体模的表面入射剂量率，使用rad-check剂量仪监测散射线照射量率，使用分辨率测试卡、CDRAD2.0体模等评价成像质量，分别研究万东CGO-3000（影像增强器型）和万东CGO-2100（平板探测器型）DSA系统的设备设置对照射剂量及成像质量的影响；对比分析上述研究结果，总结出综合剂量优化方案；最后对剂量优化方案的优化效果进行Monte Carlo程序验证。 结果 DSA系统的设备设置(附加滤过、影像探测器尺寸、几何放大、透视方式、照射野、透视条件、摄影条件以及旋转角度)对成像质量、表面入射剂量和散射线照射量都有不同程度的影响。比较两种不同的血管造影系统，在相同mAs和kV条件下，表面剂量率均随设定值的增加呈线性增加，但FPD DSA的增幅低于TV/II DSA系统，低剂量情况下成像质量高于TV/II DSA系统。机架旋转角度在RAO25、CRA30、CRA40、RAO-CRA30、RAO-CRA35，FPD系统表面剂量率略高于增强器系统，这与FPD方形视野的四角在旋转过程中的重叠有关。利用Monte Carlo程序进行验证时，全身器官有效剂量和皮肤剂量明显下降，使用剂量优化方案可有效降低介入检查时的DAP。 结论 DSA系统中的附加滤过大小、影像增强器尺寸、几何放大、透视方式、照射野、透视条件及摄影条件都会对成像质量和照射剂量产生影响；对比CGO-3000系统，CGO-2100系统在相同设备条件设置相同的情况下能够获得更高的图像分辨率和血管检测能力，并且能够不同程度降低受照者及操作者的辐射剂量。另外，，平板探测器的应用中，RAO、CRA、RAO-CRA等旋转角度对辐射剂量有一定影响，因此，在实际操作中，机架旋转角度应尽量选择能获得较高成像质量同时又具有较小辐射剂量的角度，以降低受照者接受的辐射剂量。
[Abstract]:Objective to investigate the factors affecting the imaging quality and radiation dose of (FPD DSA) digital subtraction angiography system, and compare them with the traditional image enhancer digital subtraction angiography system (TV/II DSA), compare the advantages and disadvantages between imaging quality and radiation dose, put forward a dose optimization scheme to meet the clinical requirements, and verify the optimization scheme. Materials and methods the surface incident dose rate of DSA phantom was monitored by Solidose dosimeter, the scattered radiation exposure rate was monitored by rad-check dosimeter, and the imaging quality was evaluated by resolution test card and CDRAD2.0 phantom. The effects of radiation dose and imaging quality of Wandong CGO-3000 (image enhancer) and Wandong CGO-2100 (plate detector) DSA systems were studied respectively. The comprehensive dose optimization scheme is summarized by comparing and analyzing the above research results. Finally, the optimization effect of the dose optimization scheme is verified by Monte Carlo program. Results the equipment setting of DSA system (additional filtering, image detector size, geometric amplification, perspective mode, irradiation field, perspective condition, photography condition and rotation angle) had different effects on imaging quality, surface incident dose and scattered ray exposure. Compared with the two different angiography systems, under the same mAs and kV conditions, the surface dose rate increased linearly with the increase of the set value, but the increase of FPD DSA was lower than that of TV/II DSA system, and the imaging quality was higher than that of TV/II DSA system at low dose. The dose rate of the frame rotation angle on the surface of the RAO25,CRA30,CRA40,RAO-CRA30,RAO-CRA35,FPD system is slightly higher than that of the intensifier system, which is related to the overlap of the four corners of the FPD square field in the rotation process. When verified by Monte Carlo program, the effective dose of whole body organ and skin dose decreased obviously, and the DAP. during interventional examination could be effectively reduced by using dose optimization scheme. Conclusion the additional filtration size, image intensifier size, geometric amplification, perspective mode, irradiation field, perspective conditions and photographic conditions in DSA system all have effects on imaging quality and dose. Compared with CGO-3000 system, CGO-2100 system can obtain higher image resolution and vascular detection ability under the same equipment conditions, and can reduce the radiation dose of subjects and operators to varying degrees. In addition, in the application of flat panel detector, the rotation angle such as RAO,CRA,RAO-CRA has certain influence on the radiation dose. Therefore, in practical operation, the rotation angle of the frame should try its best to select the angle which can obtain higher imaging quality and have a smaller radiation dose, so as to reduce the radiation dose accepted by the exposed person.
【学位授予单位】：泰山医学院
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：R816.2
本文编号：2502933
[Abstract]:Objective to investigate the factors affecting the imaging quality and radiation dose of (FPD DSA) digital subtraction angiography system, and compare them with the traditional image enhancer digital subtraction angiography system (TV/II DSA), compare the advantages and disadvantages between imaging quality and radiation dose, put forward a dose optimization scheme to meet the clinical requirements, and verify the optimization scheme. Materials and methods the surface incident dose rate of DSA phantom was monitored by Solidose dosimeter, the scattered radiation exposure rate was monitored by rad-check dosimeter, and the imaging quality was evaluated by resolution test card and CDRAD2.0 phantom. The effects of radiation dose and imaging quality of Wandong CGO-3000 (image enhancer) and Wandong CGO-2100 (plate detector) DSA systems were studied respectively. The comprehensive dose optimization scheme is summarized by comparing and analyzing the above research results. Finally, the optimization effect of the dose optimization scheme is verified by Monte Carlo program. Results the equipment setting of DSA system (additional filtering, image detector size, geometric amplification, perspective mode, irradiation field, perspective condition, photography condition and rotation angle) had different effects on imaging quality, surface incident dose and scattered ray exposure. Compared with the two different angiography systems, under the same mAs and kV conditions, the surface dose rate increased linearly with the increase of the set value, but the increase of FPD DSA was lower than that of TV/II DSA system, and the imaging quality was higher than that of TV/II DSA system at low dose. The dose rate of the frame rotation angle on the surface of the RAO25,CRA30,CRA40,RAO-CRA30,RAO-CRA35,FPD system is slightly higher than that of the intensifier system, which is related to the overlap of the four corners of the FPD square field in the rotation process. When verified by Monte Carlo program, the effective dose of whole body organ and skin dose decreased obviously, and the DAP. during interventional examination could be effectively reduced by using dose optimization scheme. Conclusion the additional filtration size, image intensifier size, geometric amplification, perspective mode, irradiation field, perspective conditions and photographic conditions in DSA system all have effects on imaging quality and dose. Compared with CGO-3000 system, CGO-2100 system can obtain higher image resolution and vascular detection ability under the same equipment conditions, and can reduce the radiation dose of subjects and operators to varying degrees. In addition, in the application of flat panel detector, the rotation angle such as RAO,CRA,RAO-CRA has certain influence on the radiation dose. Therefore, in practical operation, the rotation angle of the frame should try its best to select the angle which can obtain higher imaging quality and have a smaller radiation dose, so as to reduce the radiation dose accepted by the exposed person.
【学位授予单位】：泰山医学院
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：R816.2
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