| 余玲,刘斌,汪洁,陈坚,刘文冬.不同重建方法和成像方式在提高CT尿路造影图像质量中应用[J].中国医学影像技术,2016,32(12):1919~1923 |
| 不同重建方法和成像方式在提高CT尿路造影图像质量中应用 |
| Application of different reconstruction method and imaging technology in improving CT urography imaging quality |
| 投稿时间：2016-05-27 修订日期：2016-10-17 |
| DOI：10.13929/j.1003-3289.2016.12.031 |
| 中文关键词: 体层摄影术,X线计算机 宝石能谱成像 图像处理,计算机辅助 |
| 英文关键词:Tomography, X-ray computed Gemstone spectral imaging Image processing, computer-assisted |
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| 摘要点击次数: 1562 |
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| 中文摘要: |
| 目的 目的探讨滤波反投影（FBP）、自适应统计迭代重建（ASiR）、能谱成像（85 keV）及呋塞米改良法在提高CT尿路造影（CTU）图像质量中的应用价值。方法 对40例患者常规CTU扫描后，采用能谱CT行排泄期扫描，常规扫描方式下排泄期图像分别利用FBP、ASiR 30%重建，能谱成像选择85 keV时的图像。对同期32例患者采用呋塞米改良法CTU成像，采用FBP法重建。根据不同的扫描模式和重建算法，分为传统FBP组、传统ASiR组、能谱组和改良组。观察并分析4组图像，测量并比较硬化性伪影明显层面肾盏旁硬化性伪影和输尿管连续性评分及肾脏的噪声、SNR、CNR。结果 传统FBP组、传统ASiR组和能谱组患者输尿管连续性评分差异无统计学意义（χ2=3.42，P=0.49），改良组输尿管连续性评分明显优于传统FBP组（χ2=24.30，P<0.05）。4组肾盏旁硬化性伪影评分、噪声、SNR、CNR比较差异均有统计学意义（P均<0.01），且传统ASiR组、能谱组、改良组肾盏旁硬化性伪影评分两两比较差异均有统计学意义（P均<0.05），组间两两比较SD、SNR、CNR差异均有统计学意义（P均<0.05）。与传统FBP组噪声比较，传统ASiR组降低约16.00%，能谱组降低约51.13%，改良组降低约27.11%；与传统FBP组SNR比较，传统ASiR组增加约21.11%，能谱组增加约42.01%，改良组增加约77.31%；与传统FBP组CNR相比，传统ASiR组增加约21.01%，能谱组增加约39.00%，改良组增加约53.02%。结论 改良法降低CTU硬化伪影效果最佳，其次为能谱成像（85 keV）。能谱CTU降低噪声效果最佳，其次为改良法及ASiR。改良法对输尿管连续性显影效果最好。 |
| 英文摘要: |
| Objective To assess the application value of filtered back projection (FBP), adaptive statistical iterative (ASiR), gemstone spectral imaging (GSI; 85 keV) and Furosemide improved method in improving urography (CTU) image quality. Methods After conventional CTU, 40 patients underwent GSI for exeretory phase scan. Then raw data were reconstructed with FBP and ASIR 30% for conventional CTU, and 85 keV for GSI. Thirty-two patients underwent improved method CTU, the FBP reconstruction was used. According different technology and reconstruction method, all images were divided into traditional FBP, traditional ASiR, GSI and improved group. Then the scores of beam hardening artifacts (BHA) of renal calyx and the continuity of ureter, and the SD, CNR, SNR were recorded and evaluated. Results The score of continuity ureter among traditional FBP, traditional ASiR and GSI groups had no statistical significance (χ2=3.42, P=0.49), which in improved group was higher than that in traditional FBP (χ2=24.30, P<0.05). BHA and SD, SNR, CNR had statistical difference among the 4 groups (all P<0.01), and BHA between each other in traditional ASiR, GSI and improved groups had statistical difference (all P<0.05), there were statistical differences between each other in the SD, SNR, CNR of the 4 groups (all P<0.05). Compared with traditional FBP group, the SD reduced by 16.00%, 51.13% and 27.11%, the SNR increased by 21.11%, 42.01% and 77.31%, the CNR increased by 21.01%, 39.00% and 53.02% in traditional ASiR, GSI and improved groups. Conclusion The improved method is superiority to other methods in reducing the BHA, and the next is GSI (85 keV). The GSI is the most preponderant method in reducing SD, and the improved method and ASiR are also better. Improved method is superiority to other methods in displaying the continuity of ureter. |
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