低剂量CT扫描技术联合IMR技术在乳腺癌术前诊断的应用
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摘要
目的探讨低剂量CT扫描技术联合迭代模型重建(IMR)技术在乳腺癌术前中的应用。方法选择2014年12月至2017年11月于我院进行乳腺癌手术的患者60例,均进行CT乳腺和胸部扫描,分别采用模型迭代重建(IMR)技术和滤波反射投影重建(FBP)技术进行图像重建,比较两种技术客观图像质量[感兴趣区内CT值、噪声(SD)值、对比噪声比(CNR)]、主观图像质量[病灶轮廓、伪影、噪声、图像清晰度]。结果 IMR技术乳腺病灶感兴趣区内CT值与FBP技术无显著差异(P>0.05),SD值明显低于FBP技术(P<0.05),CNR明显高于FBP技术(P<0.05)。IMR技术乳腺病灶轮廓、伪影、噪声、图像清晰度评分均明显高于FBP技术(P<0.05)。IMR技术胸部伪影、噪声、图像清晰度评分均明显高于FBP技术(P<0.05)。CT扫描总剂量为(5.21±1.06)mGy,总ED为(2.20±0.41)mSy;乳腺动态扫描总剂量为(1.68±0.49)mGy,ED为(0.63±0.19)mSy。结论低剂量CT扫描技术联合IMR技术具有较好图像质量,对乳腺癌术前评估具有重要临床价值。
Objective To explore the application of low-dose CT scanning combined with iterative model reconstruction(IMR) technique in preoperative diagnosis of breast cancer. Methods A total of 60 cases of breast cancer in our hospital from December 2014 to November 2017 were selected and given CT scanning of breast and chest. Image reconstruction was carried out by using iterative model reconstruction(IMR) and filtered back-projection reconstruction(FBP) respectively. The objective image quality [CT value,noise(SD) value and contrast noise ratio(CNR) of regions of interest] and subjective image quality [lesion contour, artifact, noise and image definition] were compared between the two technologies. Results There was no significant difference in the CT value of breast regions of interest between the IMR technique and the FBP technique(P>0.05),and the SD value was significantly lower than that of the FBP technique(P<0.05) while the CNR was significantly higher than that of the FBP technique(P<0.05). The scores of lesion contour, artifact, noise and image definition of breast by the IMR technique were significantly higher than those by the FBP technique(P<0.05). The scores of artifact,noise and image definition of chest by the IMR technique were significantly higher than those by the FBP technique(P<0.05). The total dose of CT scanning was(5.21±1.06)mGy, and the total ED was(2.20±0.41) mSy. The total dose of breast dynamic scan was(1.68±0.49) mGy, and the ED was(0.63±0.19) mSy. Conclusion Low-dose CT scanning combined with IMR technique has good image quality and has important clinical value in preoperative assessment of breast cancer.
Objective To explore the application of low-dose CT scanning combined with iterative model reconstruction(IMR) technique in preoperative diagnosis of breast cancer. Methods A total of 60 cases of breast cancer in our hospital from December 2014 to November 2017 were selected and given CT scanning of breast and chest. Image reconstruction was carried out by using iterative model reconstruction(IMR) and filtered back-projection reconstruction(FBP) respectively. The objective image quality [CT value,noise(SD) value and contrast noise ratio(CNR) of regions of interest] and subjective image quality [lesion contour, artifact, noise and image definition] were compared between the two technologies. Results There was no significant difference in the CT value of breast regions of interest between the IMR technique and the FBP technique(P>0.05),and the SD value was significantly lower than that of the FBP technique(P<0.05) while the CNR was significantly higher than that of the FBP technique(P<0.05). The scores of lesion contour, artifact, noise and image definition of breast by the IMR technique were significantly higher than those by the FBP technique(P<0.05). The scores of artifact,noise and image definition of chest by the IMR technique were significantly higher than those by the FBP technique(P<0.05). The total dose of CT scanning was(5.21±1.06)mGy, and the total ED was(2.20±0.41) mSy. The total dose of breast dynamic scan was(1.68±0.49) mGy, and the ED was(0.63±0.19) mSy. Conclusion Low-dose CT scanning combined with IMR technique has good image quality and has important clinical value in preoperative assessment of breast cancer.
引文
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[2]郭勇,姜彦,张静,等.低剂量CT扫描结合模型迭代重建术前评估乳腺癌的图像质量研究[J].中国医学影像学杂志,2017, 25(5):360-364.
[3]程强,刘洋,姜彦,等.低管电压联合迭代模型重建技术在肝脏CT增强扫描中的可行性研究[J].中华放射医学与防护杂志,2015, 35(12):95 3-956.
[4]孙艳霞,丁敏.MRI、CT及X线在乳腺癌术前诊断及治疗指导中的应用[J].中国CT和MRI杂志,2017,15(9):43-46.
[5]蒋骏,黄美萍,罗纯,等.迭代重建技术在前门控结合体质量调节管电压管电流心脏C T成像的研究-降低辐射剂量及控制图像质量[J].岭南心血管病杂志,2014, 20(1):93-98.
[6]李婷婷,张永高,高剑波,等.FBP、iDose4和IMR3种重建算法对低剂量胸部CT图像质量的影响[J].实用放射学杂志,2016, 32(5):33-37.
[7]王晓红,谢道海,黄周.模型迭代重组技术在低剂量CT增强中评价胃癌图像质量的可行性[J].临床放射学杂志,2017, 36(11):1690-1694.
[8]周丹静,许建铭,姜彦,等.迭代模型重建技术在低剂量胸部CT双期增强扫描中的可行性[J].中国医学影像技术,2017, 33(5):768-772.
[9]彭徐辉.多层螺旋CT双期增强扫描对乳腺癌及早期淋巴结转移患者的诊断价值[J].实用癌症杂志,2016(2):277-279.
[10]窦欣,龚建平,张伟,等.全模型迭代重建技术联合低管电压MSCT扫描在肾动脉成像中的应用研究[J].临床放射学杂志,2017, 36(4):566-570.