| 杨德武,隋岩,刘康,牛延涛.器官剂量调制技术对鼻窦CT图像质量和辐射剂量的影响[J].中华放射医学与防护杂志,2022,42(3):230-234 |
| 器官剂量调制技术对鼻窦CT图像质量和辐射剂量的影响 |
| Effects of organ dose modulation technique on image quality and radiation dose in sinus CT scanning |
| 投稿时间：2021-10-10 |
| DOI：10.3760/cma.j.cn112271-20211010-00407 |
| 中文关键词: 器官剂量调制技术 鼻窦 眼晶状体 辐射防护 图像质量 |
| 英文关键词:Organ dose modulation Sinus Eye lens Radiation protection Image quality |
| 基金项目: |
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| 摘要点击次数: 2020 |
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| 中文摘要: |
| 目的 探讨器官剂量调制（ODM）技术行鼻窦CT扫描时对图像质量和眼晶状体辐射剂量的影响。方法 应用GERevolutionevoCT对头部拟人模体进行扫描，不开启ODM为对照组，开启ODM为观察组。通过调整管电压（140、120、100 kV）、噪声指数（N17、N18）、螺距（准直宽度20 cm时0.531、0.969；准直宽度40 mm时0.516、0.984）、等扫描参数，分别采集24个序列图像。记录鼻窦组织前（A）、左（L）、后（P）、右（R）4个方向管电流（mA）值、容积CT剂量指数（CTDIvol）和剂量长度乘积（DLP），计算感兴趣区（ROI）的CT值均值（AV）、标准差（SD）、信噪比（SNR）、对比度噪声比（CNR）和影像品质因子（FOM）。采用双盲法对图像的边缘清晰度、软组织层次、噪声、伪影进行3分制主观评分。结果 不同扫描条件组合下观察组的辐射剂量低于对照组，且观察组鼻窦组织A方向的管电流低于对照组，组间差异有统计学意义（t=2.28，P<0.05）；观察组L、P、R方向管电流和CTDIvol、DLP数值与对照组比较差异，无统计学意义（P>0.05）；两组图像的SD、SNR、CNR、FOM之间差异无统计学意义（P>0.05）；两组图像的边缘清晰度、软组织层次、噪声、伪影的主观评分之间差异无统计学意义（P>0.05）。结论 使用ODM技术行鼻窦部CT扫描可获得满足诊断的图像质量，有效地降低眼晶状体的辐射剂量，符合辐射防护最优化原则。 |
| 英文摘要: |
| Objective To investigate the effects of organ dose modulation (ODM) on image quality and radiation dose to lens during sinus CT scanning. Methods The GE Revolution EVO CT was used to scan the anthropomorphic head with ODM turned off as the control group and ODM turned on as the observation group. With different parameter combinations of tube voltage (140, 120, 100 kV), noise index (N17, N18), pitch (0.531, 0.969 at 20 cm collimation width, 0.516, 0.984 at 40 mm collination width), 24 series of images were acquired respectively. The tube current (mA) valuesat the anterior (A), left (L), posterior (P) and right (R) positions, volume CT dose index (CTDIvol) and dose length product (DLP) were recorded. Average CT values (AV), standard deviation (SD), signal-to-noise ratio (SNR), contrast to noise ratio (CNR) and image quality factor (FOM) of ROI were calculated. Double blind method was used to evaluate the edge sharpness, soft tissue level, noise and artifact on a subjective scale of 3 points. Results For the combinations of different scanning parameters, the radiation dose of the observation group was lower than that of the control group. The tube current attheposition A for the observation group was lower than that of the control group, and the difference was statistically significant (t=2.28, P<0.05). The differences oftube currentsatposotions of L, P and R,CTDIvol and DLP values in twogroupswere not statistically significant (P>0.05). There were no significant differences in SD, SNR, CNR and FOM between the two groups of images (P>0.05). There were no significant differences in the subjective scores of edge sharpness, soft tissue gradation, noise and artifacts between the two groups (P>0.05). ODM technique can effectively reduce the radiation dose of eye lens without decompromising the image quality, which could meet the requirements of diagnosis, and accord with the principle of radiological protection optimization. |
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