| 龚启慧,吕发金,张志伟,姜雪,葛冰.轨道同步扫描对头颈部体模CT血管造影柔性减影图像质量和辐射剂量的影响[J].中国医学影像技术,2022,38(5):770~774 |
| 轨道同步扫描对头颈部体模CT血管造影柔性减影图像质量和辐射剂量的影响 |
| Impact of orbital synchronized scanning on imaging quality and radiation dose of deformable subtraction CT angiography on head and neck phantom |
| 投稿时间：2021-10-19 修订日期：2022-02-14 |
| DOI：10.13929/j.issn.1003-3289.2022.05.031 |
| 中文关键词: 头部 颈 体层摄影术,X线计算机 减影技术 辐射剂量 轨道同步 体模,显像术 |
| 英文关键词:head neck tomography, X-ray computed subtraction technique radiation dosage orbital synchronized phantoms, imaging |
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| 中文摘要: |
| 目的 观察轨道同步扫描对头颈部体模CT血管造影(CTA)柔性减影图像质量和辐射剂量的影响。方法 对PBU-60型头颈部体模行不同参数下轨道同步、不同步CT扫描。平扫采用5组参数:A~D组管电压均为100 kV,管电流分别为300、150、80、40 mA;E组管电压80 kV,管电流50 mA。分别注入浓度为6.7 mgI/ml(低)、11.7 mgI/ml(中)、16.7 mgI/ml(高)的碘对比剂美普尔后行增强扫描,以Carotid软件进行减影,比较C3横突(C3横突层面)、枕骨基底部(下颌头层面)、顶骨(上矢状窦层面)及骨旁软组织的CT值及标准差(SD)值。对容积再现重组图像质量进行主观评级,观察显示完整性;统计辐射剂量。结果 轨道同步扫描在C3横突层面、下颌头层面及上矢状窦层面所获软组织CT值和SD值均低于轨道不同步扫描,所获C3横突和枕骨基底部骨的CT值和SD值均低于不同步扫描(P均＜0.001);各层面软组织及骨CT值在A、B、C组间及C、D组间差异及相邻2组间各层面软组织及骨SD值差异均无统计学意义(P均＞0.05),其余组间两两比较差异均有统计学意义(P均＜0.05)。不同扫描参数下,轨道同步扫描图像的主观评价级别均优于轨道不同步扫描(Z=-2.39、P=0.02)。轨道同步及不同步扫描时,低浓度软管在E组图像中均不可见,其余组体模2条软管在各扫描参数图像中均完整、光滑显示。轨道同步与不同步扫描时,A~E组辐射剂量均逐渐降低。相同扫描参数下,轨道同步与不同步扫描的容积CT剂量指数(CTDIvol)相同,而前者的剂量长度乘积(DLP)和有效剂量(ED)分别较后者降低3.8 mGy·cm和0.01 mSv。结论 轨道同步扫描可提高头颈部体模CTA柔性减影图像质量,并在一定程度上降低辐射剂量。 |
| 英文摘要: |
| Objective To observe the impact of orbital synchronized scanning on imaging quality and radiation dose of deformable subtraction CT angiography (CTA) based on head and neck phantom.Methods A PBU-60 head and neck phantom was scanned with different parameters under orbital synchronized and non-synchronized models. Plain scanning were performed using 5 groups of parameters, the voltage of group A—D was all 100 kV, with the current of 300, 150, 80 and 40 mA, respectively, of group E was 80 kV, with the tube current of 50 mA. After injection of low (6.7 mgI/ml), medium (11.7 mgI/ml) and high (16.7 mgI/ml) concentrations of contrast agent into 3 hoses, enhanced scans were performed. Then the data were subtracted with Carotid software. The CT values and standard deviation (SD) values were compared among C3 transverse process (C3 transverse process level), occipital base (mandibular head level), parietal bone (superior sagittal sinus level) and parietal soft tissue. The imaging quality of volume rendering was subjectively rated, and the integrity of tube display was observed, the radiation dose was counted.Results Under orbital synchronized scanning, CT and SD values of soft tissue at level of C3 transverse process, mandibular head and superior sagittal sinus were lower than those under orbital non-synchronized scanning, and CT and SD values of transverse process of C3 and occipital base were lower than those under orbital non-synchronized scanning (all P＜0.001). Under orbital synchronized scanning, CT values of soft tissue and bone at all levels were not significant different among group A, B and C as well as between group C and D (all P＞0.05), SD values of soft tissue and bone at all levels were not significant different between each 2 adjacent groups (all P＞0.05), while pairwise comparison of other groups showed significant differences (all P＜0.05). Under all parameters, the subjective evaluation results of images obtained with orbital synchronized scanning were better than those with orbital non-synchronized scanning (Z=-2.39, P=0.02). The low-concentration hose was invisible in group E under both scanning models, and the other 2 hoses in the other groups showed completely and smoothly. The radiation dose decreased gradually from group A to E under both scanning models. Under the same parameters, the volume CT dose index (CTDIvol) of orbital synchronized and non-synchronized scanning remained the same, while the dose-length product (DLP) and effective dose (ED) of the former were 3.8 mGy·cm and 0.01 mSv lower than those of the latter.Conclusion Orbital synchronized scanning could improve imaging quality of deformable subtraction head and neck CTA and reduce radiation dose to some extent on phantom. |
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