| 高留刚,金莲,倪昕晔.16-bit CT图像读取金属植入物CT值的应用[J].中国医学影像技术,2016,32(6):953~956 |
| 16-bit CT图像读取金属植入物CT值的应用 |
| Application of 16-bit CT image in reading CT values of metallic implants |
| 投稿时间：2015-09-25 修订日期：2015-11-19 |
| DOI：10.13929/j.1003-3289.2016.06.036 |
| 中文关键词: 体层摄影术,X线计算机 金属植入物 放射疗法 CT值 |
| 英文关键词:Tomography, X-ray computed Metal implant Radiotherapy CT value |
| 基金项目:江苏省自然基金(BK20151181)。 |
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| 中文摘要: |
| 目的 探讨16-bit CT图像在读取金属植入物CT值中的应用价值。方法 于模体中间分别插入一圆柱形铝棒、钛合金棒和不锈钢棒,对模体进行CT扫描,对图像重建获得12-bit和16-bit CT图像。分析并比较3种金属棒的12-bit和16-bit图像及其CT值。结果 对于同种金属棒,12-bit图像和16-bit图像显示效果基本相同。铝棒周围未显示出伪影;钛合金棒周围有较明显的放射状伪影;不锈钢棒周围有严重伪影。3种金属棒内部的显示无明显差异。12-bit和16-bit图像中,铝棒的最大CT值分别为2 159 HU和2 150 HU,平均CT值分别为2 026 HU、2 021 HU;钛合金棒的最大CT值分别为3 071 HU和6 950 HU,平均CT值分别为3 071 HU、5 957 HU;不锈钢棒的最大CT值分别为3 071 HU和12 060 HU,平均CT值分别为3 071 HU、9 397 HU。结论 16-bit的CT图像能够显示体内金属植入物的CT值分布,分辨出铝、钛合金或不锈钢的金属植入物。 |
| 英文摘要: |
| Objective To explore the application value of 16-bit image in reading CT values of metallic implants. Methods The phantom with aluminium bar, stainless steel bar and titanium bar were scanned with CT, respectively. 12-bit and 16-bit images were obtained using image reconstruction. CT values in three kinds of metal bar in 12-bit and 16-bit image were compared and analyzed. Results For the same kind of metal bar, 12-bit image and 16-bit images displayed almost the same. There were no artifacts around the aluminium bar, several artifacts around the titanium bar, more artifacts around the stainless steel. There were no obvious difference of internal images among the three kinds of metal bar. In 12-bit and 16-bit images, maximum CT values of the aluminium bar were 2159 HU and 2150 HU, and average values were 2026 HU and 2021 HU, respectively; maximum CT values of the titanium bar were 3071 HU and 6950 HU, and average values were 3071 HU and 5957 HU, respectively; maximum CT values of the stainless steel bar were 3071 HU and 12060 HU, and average values were 3071 HU and 9397 HU, respectively. Conclusion 16-bit CT images can display the distribution of CT value of metal implant in the body, and distinguish aluminium, stainless steel or titanium implants. |
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