【摘要】：目的 探討影響平板型數(shù)字減影血管造影系統(tǒng)（FPD DSA）成像質(zhì)量與輻射劑量的因素，并與傳統(tǒng)影像增強(qiáng)器型數(shù)字減影血管造影系統(tǒng)（TV/II DSA）進(jìn)行對(duì)比，比較兩者在成像質(zhì)量和輻射劑量之間的優(yōu)劣，提出滿足臨床要求的劑量優(yōu)化方案，并對(duì)優(yōu)化方案進(jìn)行驗(yàn)證。 材料與方法 利用Solidose劑量儀監(jiān)測DSA體模的表面入射劑量率，使用rad-check劑量儀監(jiān)測散射線照射量率，使用分辨率測試卡、CDRAD2.0體模等評(píng)價(jià)成像質(zhì)量，分別研究萬東CGO-3000（影像增強(qiáng)器型）和萬東CGO-2100（平板探測器型）DSA系統(tǒng)的設(shè)備設(shè)置對(duì)照射劑量及成像質(zhì)量的影響；對(duì)比分析上述研究結(jié)果，總結(jié)出綜合劑量優(yōu)化方案；最后對(duì)劑量優(yōu)化方案的優(yōu)化效果進(jìn)行Monte Carlo程序驗(yàn)證。 結(jié)果 DSA系統(tǒng)的設(shè)備設(shè)置(附加濾過、影像探測器尺寸、幾何放大、透視方式、照射野、透視條件、攝影條件以及旋轉(zhuǎn)角度)對(duì)成像質(zhì)量、表面入射劑量和散射線照射量都有不同程度的影響。比較兩種不同的血管造影系統(tǒng)，在相同mAs和kV條件下，表面劑量率均隨設(shè)定值的增加呈線性增加，但FPD DSA的增幅低于TV/II DSA系統(tǒng)，低劑量情況下成像質(zhì)量高于TV/II DSA系統(tǒng)。機(jī)架旋轉(zhuǎn)角度在RAO25、CRA30、CRA40、RAO-CRA30、RAO-CRA35，F(xiàn)PD系統(tǒng)表面劑量率略高于增強(qiáng)器系統(tǒng)，這與FPD方形視野的四角在旋轉(zhuǎn)過程中的重疊有關(guān)。利用Monte Carlo程序進(jìn)行驗(yàn)證時(shí)，全身器官有效劑量和皮膚劑量明顯下降，使用劑量優(yōu)化方案可有效降低介入檢查時(shí)的DAP。 結(jié)論 DSA系統(tǒng)中的附加濾過大小、影像增強(qiáng)器尺寸、幾何放大、透視方式、照射野、透視條件及攝影條件都會(huì)對(duì)成像質(zhì)量和照射劑量產(chǎn)生影響；對(duì)比CGO-3000系統(tǒng)，CGO-2100系統(tǒng)在相同設(shè)備條件設(shè)置相同的情況下能夠獲得更高的圖像分辨率和血管檢測能力，并且能夠不同程度降低受照者及操作者的輻射劑量。另外，，平板探測器的應(yīng)用中，RAO、CRA、RAO-CRA等旋轉(zhuǎn)角度對(duì)輻射劑量有一定影響，因此，在實(shí)際操作中，機(jī)架旋轉(zhuǎn)角度應(yīng)盡量選擇能獲得較高成像質(zhì)量同時(shí)又具有較小輻射劑量的角度，以降低受照者接受的輻射劑量。
[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.
【學(xué)位授予單位】：泰山醫(yī)學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：R816.2

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本文編號(hào)：2502933