Effect of projection number on slice image quality of micro-CT system

2009 ◽  
Author(s):  
Zheng Fang ◽  
Hui Gong ◽  
Guang Yang ◽  
Tianxu Zhang
Keyword(s):  
Image Quality ◽  
Micro Ct ◽  
Ct System ◽  
Slice Image

Assessment of image quality parameters of a novel micro-CT system compared to a conventional CT geometry

2018 ◽  
Author(s):  
Nazila Saeidnezhad ◽  
Kunal Kumar ◽  
Bernhard H. Müller ◽  
Christoph Hoeschen ◽  
Oleg Tischenko
Keyword(s):  
Image Quality ◽  
Quality Parameters ◽  
Micro Ct ◽  
Ct System ◽  
Conventional Ct

scholarly journals Development of Limited-Angle Iterative Reconstruction Algorithms with Context Encoder-Based Sinogram Completion for Micro-CT Applications

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4458 ◽  
Author(s):  
Shih-Chun Jin ◽  
Chia-Jui Hsieh ◽  
Jyh-Cheng Chen ◽  
Shih-Huan Tu ◽  
Ya-Chen Chen ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Iterative Reconstruction ◽  
Micro Ct ◽  
Reconstruction Algorithms ◽  
Generative Adversarial Network ◽  
Adversarial Network ◽  
Novel Approach ◽  
Ct System ◽  
Limited Angle

Limited-angle iterative reconstruction (LAIR) reduces the radiation dose required for computed tomography (CT) imaging by decreasing the range of the projection angle. We developed an image-quality-based stopping-criteria method with a flexible and innovative instrument design that, when combined with LAIR, provides the image quality of a conventional CT system. This study describes the construction of different scan acquisition protocols for micro-CT system applications. Fully-sampled Feldkamp (FDK)-reconstructed images were used as references for comparison to assess the image quality produced by these tested protocols. The insufficient portions of a sinogram were inpainted by applying a context encoder (CE), a type of generative adversarial network, to the LAIR process. The context image was passed through an encoder to identify features that were connected to the decoder using a channel-wise fully-connected layer. Our results evidence the excellent performance of this novel approach. Even when we reduce the radiation dose by 1/4, the iterative-based LAIR improved the full-width half-maximum, contrast-to-noise and signal-to-noise ratios by 20% to 40% compared to a fully-sampled FDK-based reconstruction. Our data support that this CE-based sinogram completion method enhances the efficacy and efficiency of LAIR and that would allow feasibility of limited angle reconstruction.

scholarly journals Evaluation of the effect of filters on reconstructed image quality from cone beam CT system

2021 ◽  
Vol 11 (1) ◽  
pp. 35-47
Author(s):  
Ngoc Ha Bui ◽  
Tien Hung Bui ◽  
Thuy Duong Tran ◽  
Kim Tuan Tran ◽  
Ngoc Toan Tran
Keyword(s):  
Image Quality ◽  
Cone Beam Ct ◽  
Three Dimensional ◽  
Reconstruction Algorithm ◽  
Reconstructed Image ◽  
Cone Beam ◽  
Spatial Filters ◽  
Dimensional Reconstruction ◽  
Ct System

: 3D Filtered Back Projection (FBP) is a three-dimensional reconstruction algorithm usually used in Cone Beam Computed Tomography (CBCT) system. FBP is one of the most popular algorithms due to its reconstruction is fast while quality of the result is acceptable. It can also handle a more considerable amount of data with same computer performance with other algorithms. However, the quality of a reconstructed image by the FBP algorithm strongly depends on spatial filters and denoising filters applied to projections. In this paper an evaluation of the reconstructed image quality of the CBCT system by using different denoising filters and spatial filters to find out the best filters for the CBCT system is performed. The result shows that, there is a significantly decrease of the noise of projection with the combination of Median and Gaussian filters. The reconstructed image has high resolution with Cosine filter and becomes more sharpen with Hanning filter.

scholarly journals The impact of spectral filtration on image quality in micro-CT system

2016 ◽  
Vol 17 (1) ◽  
pp. 301-315 ◽  
Author(s):  
Liqiang Ren ◽  
Muhammad U Ghani ◽  
Di Wu ◽  
Bin Zheng ◽  
Yong Chen ◽  
...  
Keyword(s):  
Image Quality ◽  
Micro Ct ◽  
Spectral Filtration ◽  
Ct System ◽  
The Impact

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

Organ doses and subjective image quality of indirect digital panoramic radiography

2001 ◽  
Vol 30 (6) ◽  
pp. 308-313 ◽  
Author(s):  
F Gijbels ◽  
G Sanderink ◽  
C Bou Serhal ◽  
H Pauwels ◽  
R Jacobs
Keyword(s):  
Image Quality ◽  
Panoramic Radiography ◽  
Organ Doses ◽  
Subjective Image Quality ◽  
Digital Panoramic Radiography
Sign in / Sign up

Export Citation Format

Share Document