Abstract:
:Low-dose computed tomography reconstruction is an important issue in the medical imaging domain. Sparse-view has been widely studied as a potential strategy. Compressed sensing (CS) method has shown great potential to reconstruct high-quality CT images from sparse-view projection data. Nonetheless, low-contrast structures tend to be blurred by the total variation (TV, L1-norm of the gradient image) regularization. Moreover, TV will produce blocky effects on smooth and edge regions. To overcome this limitation, this study has proposed an iterative image reconstruction algorithm by combining L1 regularization and smoothed L0 (SL0) regularization. SL0 is a smooth approximation of L0 norm and can solve the problem of L0 norm being sensitive to noise. To evaluate the proposed method, both qualitative and quantitative studies were conducted on a digital Shepp-Logan phantom and a real head phantom. Experimental comparative results have indicated that the proposed L1/SL0-POCS algorithm can effectively suppress noise and artifacts, as well as preserve more structural information compared to other existing methods.
journal_name
Biomed Mater Engjournal_title
Bio-medical materials and engineeringauthors
Qi H,Chen Z,Guo J,Zhou Ldoi
10.3233/BME-151437subject
Has Abstractpub_date
2015-01-01 00:00:00pages
S1389-98eissn
0959-2989issn
1878-3619pii
BME1437journal_volume
26 Suppl 1pub_type
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
pub_type: 杂志文章
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journal_title:Bio-medical materials and engineering
pub_type: 杂志文章,评审
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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更新日期:2014-01-01 00:00:00
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journal_title:Bio-medical materials and engineering
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doi:10.3233/BME-2012-0697
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journal_title:Bio-medical materials and engineering
pub_type: 杂志文章,评审
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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journal_title:Bio-medical materials and engineering
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