双能 CT 头部和颈部成像中生理盐水冲洗技术的效果：使用虚拟单能量成像改善图像质量和减少静脉伪影。

Effect of a saline flush technique for head and neck imaging in dual-energy CT: improvement of image quality and perivenous artefact reduction using virtual monochromatic imaging.

机构信息

Department of Radiation Oncology, Osaka International Cancer Institute, Osaka, Japan.

Department of Radiation Oncology, Osaka International Cancer Institute, Osaka, Japan; Department of Medical Physics and Engineering, Osaka University Graduate School of Medicine, Suita, Japan.

出版信息

Clin Radiol. 2019 Oct;74(10):805-812. doi: 10.1016/j.crad.2019.06.010. Epub 2019 Jul 15.

DOI:10.1016/j.crad.2019.06.010

PMID:31320111

Abstract

AIM

To evaluate the effect of the saline flush (SF) technique on the depiction of lesions and the reduction of perivenous artefacts in the head and neck region using dual-energy computed tomography (CT) with virtual monochromatic imaging (VMI).

MATERIALS AND METHODS

Fifty patients with head and neck cancer were divided into two groups: group A, without a SF and group B, with a 30-ml SF. All images were acquired using fast kilovolt-switching CT (Revolution HD, GE Healthcare, Milwaukee, WI, USA). Contrast-to-noise ratios (CNRs) of the lesions were calculated at VMI energy levels ranging from 40 to 80 keV. Subjective analysis of overall image quality, delineation of lesions, and perivenous artefacts was conducted by two reviewers at both VMI energy level 40 keV and the optimal energy level (which showed optimal CNR by objective analysis).

RESULTS

Optimal energy level was 63 keV for group A and 61 keV for group B. At VMI energy levels ranging from 40 to 80 keV, the CNR was higher for group B. The highest subjective overall image quality was shown for group B at the optimal energy level (subjective image quality mean value, 3.40). Subjective delineation of lesions was comparable. The perivenous artefact score was significantly higher for group B (2.44 versus 2.74 [p<0.05] at 40 keV, 3.20 versus 3.46 [p<0.05] at the optimal energy level).

CONCLUSION

The SF technique results in an improvement of lesion CNR and a reduction of perivenous artefacts in VMI using duel-energy CT, especially at 40 keV.

摘要

目的

使用双能 CT 虚拟单能量成像（VMI）评估盐水冲洗（SF）技术对头颈部病变显示和减少静脉周围伪影的影响。

材料和方法

将 50 例头颈部癌症患者分为两组：A 组不进行 SF，B 组进行 30ml SF。所有图像均使用快速千伏切换 CT（Revolution HD，GE Healthcare，密尔沃基，WI，美国）采集。在 VMI 能量水平 40 至 80keV 范围内计算病变的对比噪声比（CNR）。两位审阅者在 VMI 能量水平 40keV 和最佳能量水平（通过客观分析显示最佳 CNR）进行整体图像质量、病变勾画和静脉周围伪影的主观分析。

结果

A 组最佳能量水平为 63keV，B 组为 61keV。在 VMI 能量水平 40 至 80keV 范围内，B 组的 CNR 更高。B 组在最佳能量水平下显示出最高的整体图像质量（主观图像质量平均值为 3.40）。病变勾画的主观效果相当。静脉周围伪影评分 B 组明显更高（40keV 时为 2.44 对 2.74[p<0.05]，最佳能量水平时为 3.20 对 3.46[p<0.05]）。