| 夏振营,宋文艳,吴丹,孙君,王杏.基于IMR联合256层iCT低剂量扫描评估慢性鼻窦炎的可行性研究[J].中国医学影像技术,2020,36(6): |
| 基于IMR联合256层iCT低剂量扫描评估慢性鼻窦炎的可行性研究 |
| The feasibility study on the assessment of chronic sinusitis based on IMR combined with 256-slice iCT low-dose scan |
| 投稿时间：2019-05-10 修订日期：2020-06-14 |
| DOI： |
| 中文关键词: 体层摄影术，x线计算机 全模型迭代重建 鼻窦 低剂量 |
| 英文关键词:Tomography X-ray computed iterative model reconstruction paranasal sinus low dose |
| 基金项目:无 |
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| 摘要点击次数: 2003 |
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| 中文摘要: |
| 目的 探讨IMR迭代算法联合256层iCT低剂量扫描评估慢性鼻窦炎的可行性。 方法 对20例临床拟诊断为慢性鼻窦炎的患者先后分别行标准剂量和低剂量鼻窦CT检查。根据Dose Right指数和重建算法的不同分为；SD-FBP组、LD-IMR-L1组、LD-IMR-L2组及LD-IMR-L3组。记录不同扫描方案下CT容积剂量指数(CTDIvol)、剂量长度乘积(DLP)并计算有效剂量(ED),测量图像的客观噪声值,对图像噪声、伪影、窦口鼻道复合体解剖结构及病变显示情况进行评估并进行统计学分析。 结果 四组图像的平均噪声值从小到大依次为：SD-FBP组、LD-IMR-L3组、LD-IMR-L2组、LD-IMR-L1组。LD-IMR-L3组与SD-FBP组相比,差异无统计学意义。LD-IMR-L2组、LD-IMR-L1组与SD-FBP组相比,差异有统计学意义。LD-IMR各组在伪影及病变的显示上的评分较SD-FBP组无明显区别,均满足了诊断需求； LD-IMR各组在解剖结构细节的显示上较SD-FBP组欠清晰,但评分均在3分以上,均能满足诊断的需求。低剂量组CTDIvol、DLP、ED较常规剂量组分别减少89.20％、89.37％和89.36％。 结论 IMR迭代重建低剂量鼻窦CT在有效降低辐射剂量的条件下,可满足窦口鼻道复合体解剖结构的显示及慢性鼻窦炎的诊断需求。 |
| 英文摘要: |
| Objective The purpose is to investigate the feasibility of the assessment of chronic sinusitis by IMR iterative algorithm combined with 256-slice iCT low-dose scan. Methods Twenty patients clinically diagnosed with chronic sinusitis were examined with conventional dose CT scan and low-dose CT scan. According to the difference of Dose Right index and reconstruction algorithm, we collected four groups of data: SD-FBP group, LD-IMR-L1 group, LD-IMR-L2 group and LD-IMR-L3 group. The CT volumetric dose index (CTDIvol), the dose length product (DLP) and the effective dose (ED) were recorded under different scanning schemes. The objective noise value of the image was also measured. The differences of image noise, artifacts, anatomical structures of the ostiomeatal complex and lesion display were analyzed with statistically. Results The four groups were arranged in a descending order by the average noise value: SD-FBP group, LD-IMR-L3 group, LD-IMR-L2 group, LD-IMR-L1 group. There was no significant difference between the LD-IMR-L3 group and the SD-FBP group. The average noise value of LD-IMR-L2 group and the SD-FBP group were significantly different, as well as the LD-IMR-L1 group and the SD-FBP group. The scores of the artifacts and lesion display of the LD-IMR groups were not significantly different from those of the SD-FBP group, which would satisfy the diagnostic requirements. The display of anatomical details was less clear in the LD-IMR groups than that in the SD-FBP group. However, the scores in the LD-IMR groups are all above 3 points, which would satisfy the diagnostic requirements. The CTDIvol, DLP, and ED in the low-dose group were reduced by 89.20%, 89.37% and 89.36%, respectively, compared with the conventional dose group. Conclusion IMR iterative reconstruction of low-dose sinus CT can meet the requirements of displaying the important bone structure of the ostiomeatal complex. It can also satisfy the diagnosis requirements of chronic sinusitis under the condition of reducing the radiation dose effectively. |
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