| 蒋骏,黄美萍,梁长虹,等.iDose重建技术在先天性心脏病低剂量CT成像中的应用[J].中华放射医学与防护杂志,2014,34(4):306-309.Jiang Jun,Huang Meiping,Liang Changhong,et al.Application of iDose in low-dose CT cardiac imaging in patients with congenital heart disease[J].Chin J Radiol Med Prot,2014,34(4):306-309 |
| iDose重建技术在先天性心脏病低剂量CT成像中的应用 |
| Application of iDose in low-dose CT cardiac imaging in patients with congenital heart disease |
| 投稿时间：2013-06-22 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.04.018 |
| 中文关键词: 先天性心脏病 体层摄影术,X射线计算机 迭代重建技术 低剂量 |
| 英文关键词:Congenital heart disease Tomography, X-ray computed Iterative reconstruction Low-dose |
| 基金项目:国家“十二五”科技支撑计划项目（2011BAI11B22）；广东省科技支撑计划项目（2009B030801257，2006B36030026） |
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| 中文摘要: |
| 目的 探讨迭代重建技术（iDose）在先天性心脏病低剂量CT成像中的应用价值。 方法 将88例临床诊断为先天性心脏病或者先天性心脏病术后的患儿用随机数字表法分成4组，进行以体重为基础的常规X射线剂量（A组）及降低X射线剂量（B组：降低30%；C组：降低50%；D组：降低70%）前瞻性心电触发轴扫模式CT血管造影（CTA）检查，所有数据均分别采用滤波反投影（FBP）、iDose2级、iDose4级、iDose6级重建，测量升主动脉根部及肺动脉主干噪声，对图像质量进行评分，并对4组结果进行比较。 结果 A、B、C、D 4组内iDose6级重建组图像噪声最低，FBP重建组图像噪声最高，且iDose6级重建组与其余3个重建组图像噪声的差异有统计学意义（P<0.05）。用iDose6级重建后D组病例的主观评分均在3分或以上，D组用iDose6级处理后的图像主观评分与A组用FBP处理后的相当。D组患者的有效辐射剂量为（0.65±0.43）mSv。 结论 应用iDose迭代重建技术可降低噪声，提高图像质量，其中用iDose6级处理在同等条件下效果最好。在先天性心脏病CT成像中，用iDose6级重建可以降低70%的辐射剂量进行扫描。 |
| 英文摘要: |
| Objective To evaluate the value of iterative reconstruction (iDose) in low-dose CT cardiac imaging in patients with congenital heart disease (CHD). Methods Eighty-eight consecutive CHD patients referred for preoperative or post-operative CT were randomly diveded into 4 groups and undergone a prospective ECG-gated MDCT angiography with protocol A (routine low-dose depending on patient weight), B (30% of A), C (50%), and D (70%D), respectively. Filtered back projection (FBP) and grades 2,4, 6 of iDose were used for all reconstruction. Noises were measured at the root of ascending aorta and main pulmonary artery. Image qualities were graded (scale from one to five) and compared among 4 groups. Results The lowest image noise was measured in images reconstructed with grade 6 of iDose(P<0.05) while the highest one was measured in that with FBP in all groups. The subjective scores in Group D with iDose 6 reconstruction were no less than 3. The subjective score in Group D with iDose 6 was similar to that in Group A with FBP. Effective radiation dose in group D was (0.65±0.43)mSv. Conclusion Using iDose technique would reduce noise and improve image quality effectively. Grade 6 of iDose might be the best choice and would reduce effective dose by 70% in MDCT angiography in CHD patients. |
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