Photoacoustic image improvement based on a combination of sparse coding and filtering

被引:14
作者
Najafzadeh, Ebrahim [1 ,2 ]
Farnia, Parastoo [1 ,2 ]
Lavasani, Saeedeh N. [2 ,3 ]
Basij, Maryam [4 ]
Yan, Yan [4 ]
Ghadiri, Hossein [1 ,5 ]
Ahmadian, Alireza [1 ,2 ]
Mehrmohammadi, Mohammad [4 ,6 ]
机构
[1] Univ Tehran Med Sci, Fac Med, Med Phys & Biomed Engn Dept, Tehran, Iran
[2] Univ Tehran Med Sci, Res Ctr Biomed Technol & Robot, Imam Khomeini Hosp Complex, Tehran, Iran
[3] Shahid Beheshti Univ Med Sci, Fac Med, Dept Biomed Engn & Med Phys, Tehran, Iran
[4] Wayne State Univ, Dept Biomed Engn, Detroit, MI 48201 USA
[5] Univ Tehran Med Sci, Res Ctr Mol & Cellular Imaging, Tehran, Iran
[6] Wayne State Univ, Dept Elect & Comp Engn, Detroit, MI 48202 USA
关键词
photoacoustic imaging; signal denoising; sparse coding; total variation; filtering; signal-to-noise ratio; CARBON NANOTUBES; TOMOGRAPHY; MICROSCOPY; SIGNAL;
D O I
10.1117/1.JBO.25.10.106001
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Significance: Photoacoustic imaging (PAI) has been greatly developed in a broad range of diagnostic applications. The efficiency of light to sound conversion in PAI is limited by the ubiquitous noise arising from the tissue background, leading to a low signal-to-noise ratio (SNR), and thus a poor quality of images. Frame averaging has been widely used to reduce the noise; however, it compromises the temporal resolution of PAI. Aim: We propose an approach for photoacoustic (PA) signal denoising based on a combination of low-pass filtering and sparse coding (LPFSC). Approach: LPFSC method is based on the fact that PA signal can be modeled as the sum of low frequency and sparse components, which allows for the reduction of noise levels using a hybrid alternating direction method of multipliers in an optimization process. Results: LPFSC method was evaluated using in-silico and experimental phantoms. The results show a 26% improvement in the peak SNR of PA signal compared to the averaging method for in-silico data. On average, LPFSC method offers a 63% improvement in the image contrast-to-noise ratio and a 33% improvement in the structural similarity index compared to the averaging method for objects located at three different depths, ranging from 10 to 20 mm, in a porcine tissue phantom. Conclusions: The proposed method is an effective tool for PA signal denoising, whereas it ultimately improves the quality of reconstructed images, especially at higher depths, without limiting the image acquisition speed. (C) The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License.
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页数:16
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