scholarly journals Nasofrontal Outflow Tract Visibility in Computed Tomography Imaging of Frontal Sinus Fractures

2013 ◽  
Vol 6 (4) ◽  
pp. 237-239 ◽  
Author(s):  
Kevin Bush ◽  
Menno Huikeshoven ◽  
Nathan Wong
Keyword(s):  
Computed Tomography ◽  
Frontal Sinus ◽  
Ct Imaging ◽  
Outflow Tract ◽  
Slice Thickness ◽  
Computed Tomography Imaging ◽  
Tomography Imaging ◽  
Multiple Factors ◽  
Frontal Sinus Fracture ◽  
Sagittal Slice

The choice of frontal sinus fracture treatment is based on multiple factors, one of which is injury to the nasofrontal outflow tract (NFOT). Computed tomography (CT) imaging of the NFOT can play an important role in the decision process. We sought to assess the visibility of the NFOT on CT scans in frontal sinus fractures. Patients with frontal sinus fractures (including the posterior table) receiving a CT scan from April 1st 2001 to December 31st 2009 were included. Scans were retrospectively assessed for available views (axial, coronal, and sagittal), slice thickness, inclusion of the anatomical NFOT region in the scanned area, and visibility of the NFOT. A total of 170 patients were included. In majority (71%) of patients NFOT was visible on one or more views, whereas in 33% ( N = 56) of patients had three complete views (complete anatomical NFOT region scanned in three views). In this subgroup, the ability to assess the NFOT increased to 89%. When selecting patients with three complete views of ≤ 2 mm slice thickness ( N = 47), the ability to assess the NFOT increased to 96%. In conclusion, when assessing the NFOT using CT imaging, having three complete views (axial, coronal, and sagittal) and a ≤ 2 mm slice thickness greatly increases the NFOT visibility.

scholarly journals Frontal sinus outflow tract evaluation by sagittal computed tomography in frontal sinus fracture

2013 ◽  
Vol 44 (2) ◽  
pp. 209-213
Author(s):  
Mohammad Waheed El-Anwar ◽  
Hosam Nabil Almassry ◽  
Inas Elfiki ◽  
Ghada Abdulmonaem
Keyword(s):  
Computed Tomography ◽  
Frontal Sinus ◽  
Outflow Tract ◽  
Frontal Sinus Fracture

Large-scale synthesis of PEGylated lutetium hydroxycarbonates as nanoparticulate contrast agents for X-ray CT imaging

2015 ◽  
Vol 39 (1) ◽  
pp. 589-594 ◽  
Author(s):  
Zhaogui Ba ◽  
Yumin Zhang ◽  
Junpei Wei ◽  
Jiwu Han ◽  
Zhenqiang Wang ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contrast Agents ◽  
High Performance ◽  
Large Scale ◽  
Ct Imaging ◽  
Systemic Toxicity ◽  
Computed Tomography Imaging ◽  
X Ray ◽  
Tomography Imaging ◽  
X Ray Computed

PEGylated lutetium hydroxycarbonate nanoparticles have been prepared via a large-scale strategy and successfully used as high-performance contrast agents for X-ray computed tomography imaging with neglectable systemic toxicity.

Synthesis of PEGylated low generation dendrimer-entrapped gold nanoparticles for CT imaging applications

Nanoscale ◽  
2014 ◽  
Vol 6 (9) ◽  
pp. 4521-4526 ◽  
Author(s):  
Hui Liu ◽  
Han Wang ◽  
Yanhong Xu ◽  
Mingwu Shen ◽  
Jinglong Zhao ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Gold Nanoparticles ◽  
Ct Imaging ◽  
Computed Tomography Imaging ◽  
Tomography Imaging

PEGylated low generation dendrimers can be used as templates to form gold nanoparticles for efficient computed tomography imaging applications.

scholarly journals A Voxel-Based Assessment of Noise Properties in Computed Tomography Imaging with the ASiR-V and ASiR Iterative Reconstruction Algorithms

2021 ◽  
Vol 11 (14) ◽  
pp. 6561
Author(s):  
Patrizio Barca ◽  
Daniela Marfisi ◽  
Chiara Marzi ◽  
Sabino Cozza ◽  
Stefano Diciotti ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Noise Reduction ◽  
Iterative Reconstruction ◽  
Reduction Potential ◽  
Ct Imaging ◽  
Reconstruction Algorithms ◽  
Computed Tomography Imaging ◽  
Tomography Imaging ◽  
First Time

Given the inherent characteristics of nonlinearity and nonstationarity of iterative reconstruction algorithms in computed tomography (CT) imaging, this study aimed to perform, for the first time, a voxel-based characterization of noise properties in CT imaging with the ASiR-V and ASiR algorithms as compared with conventional filtered back projection (FBP). Multiple repeated scans of the Catphan-504 phantom were carried out. CT images were reconstructed using FBP and ASiR/ASiR-V with different blending levels of reconstruction (20%, 40%, 60%, 80%, 100%). Noise maps and their nonuniformity index (NUI) were obtained according to the approach proposed by the report of AAPM TG-233. For the homogeneous CTP486 module, ASiR-V/ASiR allowed a noise reduction of up to 63.7%/52.9% relative to FBP. While the noise reduction values of ASiR-V-/ASiR-reconstructed images ranged up to 33.8%/39.9% and 31.2%/35.5% for air and Teflon contrast objects, respectively, these values were approximately 60%/50% for other contrast objects (PMP, LDPE, polystyrene, acrylic, Delrin). Moreover, for all contrast objects but air and Teflon, ASiR-V showed a greater noise reduction potential than ASiR when the blending level was ≥40%. While noise maps of the homogenous CTP486 module showed only a slight spatial variation of noise (NUI < 5.2%) for all reconstruction algorithms, the NUI values of iterative-reconstructed images of the nonhomogeneous CTP404 module increased nonlinearly with blending level and were 19%/15% and 6.7% for pure ASiR-V/ASiR and FBP, respectively. Overall, these results confirm the potential of ASiR-V and ASiR in reducing noise as compared with conventional FBP, suggesting, however, that the use of pure ASiR-V or ASiR might be suboptimal for specific clinical applications.

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