TH-C-103-12: Iterative Reconstruction for Dual Energy CT Using Accelerated Barrier Optimization Compressed Sensing (ABOCS)

2013 ◽  
Vol 40 (6Part33) ◽  
pp. 544-544
Author(s):  
X Dong ◽  
T Niu ◽  
L Zhu
Keyword(s):  
Compressed Sensing ◽  
Iterative Reconstruction ◽  
Dual Energy ◽  
Dual Energy Ct

scholarly journals First experience with combined use of adaptive statistical iterative reconstruction and gemstone spectral imaging in spinal fusion CT images

2015 ◽  
Author(s):  
Fengdan Wang ◽  
Yan Zhang ◽  
Zhengyu Jin ◽  
Richard Zwar
Keyword(s):  
Image Quality ◽  
Iterative Reconstruction ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Metal Artifacts ◽  
Adaptive Statistical Iterative Reconstruction ◽  
Subjective Image Quality ◽  
Gemstone Spectral Imaging ◽  
Statistical Iterative Reconstruction ◽  
Combined Use

Objective. To explore whether the image noises and the metal artifacts could be further managed by the combined use of two technologies, the adaptive statistical iterative reconstruction (ASIR) and the monochromatic imaging generated by gemstone spectral imaging (GSI) dual-energy CT. Materials and Methods. Fifty-one patients with 318 spinal pedicle screws were prospectively scanned with dual energy CT by using fast kV-switching GSI between 80 and 140 kVp. The monochromatic GSI images at 110 keV were reconstructed either without ASIR or with ASIR of various levels (30%, 50%, 70% and 100%). For these five sets of images, both objective and subjective image quality assessments were performed to evaluate the image quality. Results. With objective image quality assessment, the metal artifacts (measured by an artifacts index) significantly decreased when increasing levels of ASIR was utilized (p < 0.001). Moreover, adding ASIR to GSI also decreased the image noise (p < 0.001) and improved the signal-to-noise ratio (SNR, p < 0.001). With subjective image quality analysis, the inter-reader agreements were good, with intra-class correlation coefficients (ICC) of 0.89 to 0.99. Meanwhile, the visualization of the peri-implant soft tissue was improved at higher ASIR levels (p < 0.001). Conclusion. Combined use of ASIR and GSI is shown to decrease the image noise and improve the image quality in post-spinal fusion CT scans. Optimal results were achieved with ASIR levels of over 70%.

Combined use of iterative reconstruction and monochromatic imaging in spinal fusion CT images

2016 ◽  
Vol 58 (1) ◽  
pp. 62-69 ◽  
Author(s):  
Fengdan Wang ◽  
Yan Zhang ◽  
Huadan Xue ◽  
Wei Han ◽  
Xianda Yang ◽  
...  
Keyword(s):  
Image Quality ◽  
Spinal Fusion ◽  
Iterative Reconstruction ◽  
Dual Energy ◽  
Image Noise ◽  
Dual Energy Ct ◽  
Spinal Diseases ◽  
Metal Artifacts ◽  
Monochromatic Imaging ◽  
Combined Use

Background Spinal fusion surgery is an important procedure for treating spinal diseases and computed tomography (CT) is a critical tool for postoperative evaluation. However, CT image quality is considerably impaired by metal artifacts and image noise. Purpose To explore whether metal artifacts and image noise can be reduced by combining two technologies, adaptive statistical iterative reconstruction (ASIR) and monochromatic imaging generated by gemstone spectral imaging (GSI) dual-energy CT. Material and Methods A total of 51 patients with 318 spinal pedicle screws were prospectively scanned by dual-energy CT using fast kV-switching GSI between 80 and 140 kVp. Monochromatic GSI images at 110 keV were reconstructed either without or with various levels of ASIR (30%, 50%, 70%, and 100%). The quality of five sets of images was objectively and subjectively assessed. Results With objective image quality assessment, metal artifacts decreased when increasing levels of ASIR were applied ( P < 0.001). Moreover, adding ASIR to GSI also decreased image noise ( P < 0.001) and improved the signal-to-noise ratio ( P < 0.001). The subjective image quality analysis showed good inter-reader concordance, with intra-class correlation coefficients between 0.89 and 0.99. The visualization of peri-implant soft tissue was improved at higher ASIR levels ( P < 0.001). Conclusion Combined use of ASIR and GSI decreased image noise and improved image quality in post-spinal fusion CT scans. Optimal results were achieved with ASIR levels ≥70%.

Iterative reconstruction for low dose dual energy CT using information-divergence constrained spectral redundancy information

2018 ◽  
Vol 26 (2) ◽  
pp. 311-330 ◽  
Author(s):  
Jiahui Lin ◽  
Hao Zhang ◽  
Jing Huang ◽  
Zhaoying Bian ◽  
Shanli Zhang ◽  
...  
Keyword(s):  
Iterative Reconstruction ◽  
Low Dose ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Information Divergence

Virtual unenhanced imaging of the liver with third-generation dual-source dual-energy CT and advanced modeled iterative reconstruction

2016 ◽  
Vol 85 (7) ◽  
pp. 1257-1264 ◽  
Author(s):  
Carlo N. De Cecco ◽  
Giuseppe Muscogiuri ◽  
U. Joseph Schoepf ◽  
Damiano Caruso ◽  
Julian L. Wichmann ◽  
...  
Keyword(s):  
Iterative Reconstruction ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Third Generation ◽  
Dual Source ◽  
Virtual Unenhanced

scholarly journals Iterative reconstruction for dual energy CT with an average image-induced nonlocal means regularization

2017 ◽  
Vol 62 (13) ◽  
pp. 5556-5574 ◽  
Author(s):  
Houjin Zhang ◽  
Dong Zeng ◽  
Jiahui Lin ◽  
Hao Zhang ◽  
Zhaoying Bian ◽  
...  
Keyword(s):  
Iterative Reconstruction ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Nonlocal Means ◽  
Average Image
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