Background and objective

To study the radiation dose and image quality on the use of full-field organ dose modulation (ODM) on cervical-thoracic-abdominal-pelvic contrast-enhanced computed tomography (CT) scanning on female chemotherapy patients.

Methods

Eighty female chemotherapy patients undergoing cervical-thoracic-abdominal-pelvic contrast-enhanced CT were prospectively enrolled and randomly divided into two groups: group A and group B, each with 40 patients. Full-field ODM technique was used on group A and regular scanning patterns were used on group B. We calculated and recorded the signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), subjective scores, mean tube currents of the anterior, left, posterior, and right aspects of the thyroid, breast, and ovary layers of all the images. The CT dose index volume (CTDIvol) and dose-length product (DLP) of each patient were recorded and the effective radiation dose (ED) was calculated. The above data were statistically analyzed.

Results

There were no statistically significant differences in the SNR, CNR, and image quality scores of the thyroid, breast, and ovary layers of groups A and B during the arterial and venous phases (P > 0.05). The tube current on the anterior, left, posterior, and right aspects of the thyroid, breast, and ovary layers during the arterial and venous phases (thyroid: 324.46 ± 53.2 and 327.97 ± 61.34; breast: 243.13 ± 50.04 and 248.32 ± 60.33; ovary: 332.28 ± 71.50 and 339.78 ± 76.69; respectively) of group A were (statistically) significantly lower than those of group B (thyroid: 407.60 ± 96.81 and 402.73 ± 90.15; breast: 313.00 ± 106.68 and 315.20 ± 106.73; ovary: 457.78 ± 106.56 and 459.63 ± 106.27; respectively) (P < 0.05). The respective mean CTDIvol and DLP in group A were 22% and 24% lower than those of group B. The mean EDs of the neck, chest, and abdominal-pelvic region in group A were 19.3%, 21.4%, and 26.4% lower than those of group B, respectively (P < 0.05).

Conclusion

The use of ODM can reduce radiation dose of female chemotherapy patients undergoing cervical-thoracic-abdominal-pelvic contrast-enhanced CT, especially radiation-sensitive organs, while maintaining overall image quality.

中文翻译：

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全视野器官剂量调制技术在颈胸腹部造影对比计算机断层扫描中的应用

背景和目标

要研究在女性化疗患者的颈胸腹盆腔对比增强计算机断层扫描（CT）扫描中使用全视野器官剂量调制（ODM）的辐射剂量和图像质量。

方法

前瞻性纳入了80例行颈胸腹盆腔对比增强CT扫描的女性化疗患者，并将其随机分为两组：A组和B组，每组40例。A组采用全场ODM技术，B组采用常规扫描模式。我们计算并记录了信噪比（SNR），对比噪声比（CNR），主观评分，平均显像管所有图像的甲状腺，乳腺和卵巢层的前，左，后和右方面的电流。记录每位患者的CT剂量指数体积（CTDIvol）和剂量长度乘积（DLP），并计算有效辐射剂量（ED）。对以上数据进行统计分析。

结果

在动脉和静脉阶段，A组和B组的甲状腺，乳腺和卵巢层的SNR，CNR和图像质量得分在统计学上无显着差异（P  > 0.05）。在动脉和静脉期，甲状腺，乳腺和卵巢层的前，左，后和右面的管电流（甲状腺：324.46±53.2和327.97±61.34；乳房：243.13±50.04和248.32±60.33； A组的卵巢：332.28±71.50和339.78±76.69;（统计学上）显着低于B组（甲状腺：407.60±96.81和402.73±90.15;乳房：313.00±106.68和315.20±106.73;卵巢：457.78 P分别为±106.56和459.63±106.27; <0.05）。A组的平均CTDIvol和DLP分别比B组低22％和24％。A组的颈部，胸部和腹部骨盆区域的平均ED降低了19.3％，21.4％和26.4％分别高于B组（P  <0.05）。

结论

ODM的使用可以减少接受宫颈-胸-腹-盆腔对比增强CT扫描的女性化疗患者的放射剂量，尤其是放射敏感器官，同时保持整体图像质量。