An Adaptive Medical Ultrasound Images Despeckling Method Based on Deep Learning
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摘要:
针对传统医学超声图像去斑方法的不足,该文提出一种自适应多曝光融合框架和前馈卷积神经网络模型图像去斑方法。首先,制作超声图像训练数据集;然后,提出一种自适应增强因子的多曝光融合框架,增强图像进行有效特征提取;最后,通过网络训练去斑模型并获得去斑后的图像。实验结果表明,该文较已有的方法,能更有效地滤除医学超声图像中的斑点噪声并更多的保留图像细节。
Abstract:Considering the shortage of traditional medical ultrasound image despeckle methods, an adaptive multi-exposure fusion framework and feedforward convolutional neural network model image despeckle method is proposed. Firstly, an ultrasound image training data set is produced. Then, a multi-exposure fusion framework with adaptive enhancement factors is proposed to enhance the image for effective feature extraction.Finally, a speckle model is trained through the network and a speckle image is obtained. Experimental results show that, compared with the existing methods, this paper can more effectively remove speckle noise in medical ultrasound images and retain more image details.
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表 1 模拟斑点肝脏超声图像1不同方法PSNR结果(dB)
方法 斑点噪声的标准差σ 0.5 0.6 0.7 0.8 0.9 BI-DTCWT 35.4225 33.8461 32.5368 31.4265 30.3688 NPSM 34.5827 32.9573 31.5366 30.3250 29.2056 NL-means 34.9289 34.1934 33.3554 32.5658 31.6134 BM3D 36.1701 35.7552 35.2485 34.8951 34.2035 Local_entropy_qsp 36.7812 36.1083 35.4363 35.0726 34.5014 DnCNN 35.7701 35.8394 35.8180 35.6769 35.3885 本文方法 36.7203 36.7139 36.6025 36.3568 35.9492 表 4 模拟斑点肝脏超声图像2不同方法
$\beta $ 结果方法 斑点噪声的标准差σ 0.5 0.6 0.7 0.8 0.9 BI-DTCWT 0.7078 0.6359 0.5612 0.5099 0.4661 NPSM 0.6830 0.6197 0.5479 0.4990 0.4517 NL-means 0.7191 0.6761 0.6037 0.5449 0.4899 BM3D 0.8030 0.7950 0.7826 0.7683 0.7355 Local_entropy_qsp 0.8263 0.8090 0.7787 0.7567 0.7384 DnCNN 0.9286 0.9238 0.9156 0.9029 0.8812 本文方法 0.9394 0.9325 0.9217 0.9653 0.8836 表 2 模拟斑点肝脏超声图像2不同方法PSNR结果(dB)
方法 斑点噪声的标准差σ 0.5 0.6 0.7 0.8 0.9 BI-DTCWT 31.0477 29.5409 28.0856 27.4342 26.2056 NPSM 31.5374 30.0985 28.6745 27.6699 26.6843 NL-means 32.7360 31.7539 30.4860 29.5105 28.4174 BM3D 33.8786 33.3096 32.5436 32.0199 31.2079 Local_entropy_qsp 34.3157 33.2426 32.1706 31.5329 30.8599 DnCNN 34.9760 35.0382 34.8497 34.3851 33.6562 本文方法 35.9280 35.9170 35.6289 35.0301 34.1677 表 3 模拟斑点肝脏超声图像1不同方法
$\beta $ 结果方法 斑点噪声的标准差σ 0.5 0.6 0.7 0.8 0.9 BI-DTCWT 0.6416 0.5611 0.4823 0.4291 0.3846 NPSM 0.5972 0.5154 0.4352 0.3817 0.3393 NL-means 0.4522 0.4102 0.3564 0.3262 0.2949 BM3D 0.5969 0.5820 0.5685 0.5477 0.5016 Local_entropy_qsp 0.6540 0.6287 0.5991 0.5842 0.5621 DnCNN 0.7803 0.7726 0.7595 0.7393 0.7106 本文方法 0.8128 0.8011 0.7831 0.7564 0.7208 表 5 真实斑点超声图像不同方法ENL结果
方法 ENL等效视数值 BI-DTCWT 61.2209 NPSM 64.6016 NL-means 109.5584 BM3D 93.4877 Local_entropy_qsp 79.1016 DnCNN 132.9184 本文方法 134.3287 表 6 50张真实斑点超声图像不同方法ENL平均值比较
方法 ENL等效视数值平均值 BI-DTCWT 75.5182 NPSM 75.5941 NL-means 110.6393 BM3D 110.9127 Local_entropy_qsp 93.7911 DnCNN 140.3622 本文方法 147.0689 -
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