| 何斌,郭濴,杨瑞静,刘红明,王鹏程.自适应统计迭代重建在儿童颞骨低剂量CT扫描中的应用研究[J].中华放射医学与防护杂志,2016,36(7):544-547 |
| 自适应统计迭代重建在儿童颞骨低剂量CT扫描中的应用研究 |
| Application of adaptive statistical iterative reconstruction in low dose temporal bone CT scan of children |
| 投稿时间：2016-02-04 |
| DOI：10.3760/cma.j.issn.0254-5098.2016.07.014 |
| 中文关键词: 儿童 颞骨 辐射剂量 评价研究 |
| 英文关键词:Children Temporal bone Radiation dose Evaluation research |
| 基金项目: |
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| 中文摘要: |
| 目的 对比宝石高分辨CT及64排容积CT扫描的辐射剂量，评价自适应统计迭代重建技术（ASiR）对儿童颞骨低剂量扫描的价值。方法 将60例因先天性耳聋的患儿按照性别、年龄及就诊顺序分为A组和B组，每组30例。A组采用Discovery HD CT 750行低剂量颞骨CT扫描，预设噪声指数（NI）为12，使用自适应流计迭代重建（ASiR）对原始图像进行后处理重建，ASiR权重值设为40％。B组采用Lightspeed VCT 64进行扫描，NI为8，使用滤波反向投影（FBP）对图像进行重建。分别记录各组CT扫描的最大电流、最小电流及容积CT剂量指数（CTDIvol），测量并记录有效剂量及临近颞骨密度相对较均匀的脑组织客观噪声，同时评价和记录图像的主观图像质量。使用SPSS 18.0统计软件对各组数据进行统计学分析。结果 A组的平均管电流和CTDIvol值分别为（110.40±21.72） mA和（26.43±3.48） mGy，B组分别为（168.56±24.36） mA 和（39.66±4.17） mGy，两组比较差异有统计学意义（t=-9.76、-13.31， P < 0.05）。两组患儿临近颞骨密度相对较均匀的脑组织NI分别为：A组（33.13±2.68）、B组 （33.79±2.93），两组间差异无统计学意义（P > 0.05）。A、B两组图像主观评分分别为 （4.06±0.03）和（4.05±0.03）；两组比较差异无统计学意义（P > 0.05）。 结论 在获得同样质量图像的前提下，与GE Lightspeed VCT 64的FBP方法相比，GE Discovery HD CT 750采用40％ASiR方法并提高4个单位NI值的扫描方案可有效减低儿童颞骨CT扫描的辐射剂量。 |
| 英文摘要: |
| Objective To evaluate clinical use of adaptive statistical iterative reconstruction (ASiR) method in low-dose scan on children temporal bone by comparison of radiation dose delivered by GE Discovert HD CT 750 scan and GE Lightspeed VCT64 scan.Method Sixty patients with congenital deafness were divided into two groups according to gender, age (each N=30).Group a received low-dose CT scan on temporal bone by GE Discovery HDCT 750 (preset NI=12), and the original images were reconstructed with ASiR (weighted value=40%). Group B received CT scan by GE Lightspeed VCT 64 (preset NI=8), and the original images were reconstructed with filter back projection (FBP). Data were collected and analysed using the SPSS 18.0 software. Resultes The mean value of electric current of average tube and CTDIvol were significantly different between group A and B [(110.40±21.72) mA vs. (168.56±24.36) mA, and (26.43±3.48) mGy vs. (39.66±4.17) mGy, respectively (t=-9.76,-3.31,P<0.05)]. The noise index was (33.13±2.68) in group A and (33.79±2.93) in group B respectively, and the results had no statistical significance (P > 0.05). Subjective scores of the images were (4.06±0.03) and (4.05±0.03), with no statistical significance either (P > 0.05). ConclusionsOn a condition of achieving same image quality, CT scan program using GE Discovery HD CT 750 with 40% ASiR reconstruction and 4 units NI value enhancement could effectively reduce radiation dose on children's temporal bone compared to FBP method using GE Lightspeed VCT 64. |
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