三维超声图像融合技术对肝脏的影响因素

目的 探讨三维超声图像融合技术的影响因素,以获取最佳图像融合效果。方法 纳入10名健康志愿者进行肝脏三维超声容积图像,采用基于肝脏血管树三维超声图像融合技术,对肝脏右前叶进行图像自动融合。于平静呼气末、平卧位、容积角度90°采集图像,设为对照图像,观察呼吸时相、体位、扫查切面和容积角度对该技术成功率和配准误差的影响。结果 对照图像融合成功率达100%(10/10),中位配准误差为1.22 mm(0.57~1.88 mm);变换呼吸相、容积角度、体位及切面均不同程度降低了图像融合成功率,以体位[40.00%(4/10)]和容积角度[30.00%(3/10)]为著(P均<0.05),变换体位和切面明显提高了中位配准误差[3.01(2.59~4.49)、2.74(1.66~4.30),P均<0.05]。结论 于同一呼吸相、同一体位、相同切面及采集最大容积角度下,三维超声图像融合技术能够获得最佳的融合效果。

Influencing factors in liver on three-dimensional ultrasound single-modality images fusion technology

Objective To explore influencing factors on three-dimensional ultrasound (3D-US) images fusion technology and to obtain ideal fusion effection. Methods 3D-US volumetric images of right hepatic anterior segment from 10 healthy volunteers were acquired and 3D-US automatic registrations based on hepatic vessel were performed in every pair of images. Control images were collected at the end of the breath under hyperthesis with volumetric scanning angle of 90°. The impact of the influencing factors including breathing, posture, intercostal and volumetric scanning angle on the technical success rate and accuracy of 3D-US automatic registrations were observed. Results In control images, the technical success rate was 100% (10/10) and median registration error distance was 1.22 mm (0.57-1.88 mm). The technical success rates were affected by each above influencing factor in different degrees, especially position and volumetric scanning angle (40.00%[4/10] and 30.00% [3/10], both P<0.05). Change of posture and intercostal increased median registration error distanc (3.01 [2.59-4.49], 2.74 [1.66-4.30], both P<0.05]. Conclusion Under the condition of the same breath, the same position, the same intercostal and maximum volumetric scanning angle, 3D-US single-modality images fusion technology can obtain the ideal fused effectiveness.