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低劑量CT圖像全變分深度展開(kāi)去噪網(wǎng)絡(luò )
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中北大學(xué) 信息與通信工程學(xué)院

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山西省基礎研究計劃項目:202303021211148,202103021224204,20210302124403;山西省回國留學(xué)人員科研資助項目(2021-111)


Deep Total Variation Denoising Network for Low-Dose CT Images
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    摘要:

    對低劑量CT圖像去噪進(jìn)行了研究,分析了神經(jīng)網(wǎng)絡(luò )去噪在偽影抑制中計算性能低、泛化性不足的問(wèn)題。采用各向異性全變分深度展開(kāi)去噪網(wǎng)絡(luò ),新方法結合圖像相鄰體素的邊緣特性,引入各向異性TV正則項保留圖像結構信息,避免各向同性TV導致的邊緣模糊,并通過(guò)Chambolle-Pock算法求解數學(xué)模型,適配深度展開(kāi)到卷積神經(jīng)網(wǎng)絡(luò )。此外,結合像素注意力機制進(jìn)行網(wǎng)絡(luò )優(yōu)化,捕捉圖像中的重要細節。經(jīng)實(shí)驗測試,基于Mayo 2016數據集,該方法在圖像去噪效果上優(yōu)于傳統方法及其他先進(jìn)網(wǎng)絡(luò )模型,在PSNR、SSIM和VIF等指標上表現更優(yōu),滿(mǎn)足低劑量CT圖像高質(zhì)量重建的需求。

    Abstract:

    A study was conducted on denoising low-dose CT images, analyzing the issues of low computational performance and insufficient generalization in neural network denoising for artifact suppression. An Anisotropic Total Variation Deep Unfolding Denoising Network was adopted, with the new method incorporating the edge characteristics of adjacent voxels by introducing an anisotropic TV regularization term to preserve the structural information of images and avoid edge blurring caused by isotropic TV. The Chambolle-Pock algorithm was employed to solve the mathematical model, adapting it for deep unfolding into convolutional neural networks. Additionally, a pixel attention mechanism was integrated for network optimization to capture important image details. Experimental tests based on the Mayo 2016 dataset demonstrated that this method outperforms traditional methods and other advanced network models in image denoising, showing superior performance in PSNR, SSIM, and VIF metrics. This method meets the requirements for high-quality reconstruction of low-dose CT images.

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吳涵,張鵬程,桂志國,劉祎.低劑量CT圖像全變分深度展開(kāi)去噪網(wǎng)絡(luò )計算機測量與控制[J].,2024,32(12):229-235.

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歷史
  • 收稿日期:2024-05-28
  • 最后修改日期:2024-07-09
  • 錄用日期:2024-07-09
  • 在線(xiàn)發(fā)布日期: 2024-12-24
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