scholarly journals Reconstruction Method for Nonconcyclic Dual-Source Circular Cone-Beam CT with a Large Field of View

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Ming Chen ◽  
Gang Li ◽  
Weiwei Qi ◽  
Jing Zou ◽  
Yong-guo Zheng
Keyword(s):  
Ct Scanning ◽  
Ct Images ◽  
Circular Cone ◽  
Field Of View ◽  
Cone Beam ◽  
Large Field ◽  
Reconstruction Method ◽  
Dual Source Ct ◽  
Dual Source ◽  
Scanning Geometry

In industrial computed tomography (CT), it is often required to inspect large objects whose size is beyond a reconstructed field of view (FOV). Some multiscan modes have been developed to acquire the complete CT projection data for a larger object using small panel detectors. In this paper, we give a non-concyclic dual-source circular cone-beam scanning geometry based on the idea of multiscan modes and propose a backprojection-filtration-based (BPF) reconstruction algorithm without data rebinning. Since the FOV calculated according to this nonconcyclic dual-source circular CT scanning geometry is larger than cardiac dual-source CT scanning geometry, our method can reconstruct larger horizontal slices (i.e., the slices perpendicular to rotation axis) than cardiac dual-source CT. The quality of CT images is expected to be superior to those obtained using larger panel detectors. The simulation results have indicated that CT images obtained by the proposed method are satisfying.

Analysis of left atrial appendix by dual-source CT coronary angiography: Morphologic classification and imaging by volume rendered CT images

2011 ◽  
Vol 80 (3) ◽  
pp. e346-e350 ◽  
Author(s):  
Bekir Erol ◽  
Musturay Karcaaltincaba ◽  
Kudret Aytemir ◽  
Nurdan Cay ◽  
Tuncay Hazirolan ◽  
...  
Keyword(s):  
Coronary Angiography ◽  
Left Atrial ◽  
Ct Images ◽  
Ct Coronary Angiography ◽  
Dual Source Ct ◽  
Dual Source ◽  
Morphologic Classification

Dual-Source CT Images of a Thrombosed Mechanical Mitral Prosthesis

2011 ◽  
Vol 26 (3) ◽  
pp. 300-301
Author(s):  
Cezary Kepka ◽  
Maksymilian P. Opolski ◽  
Jerzy Lichomski ◽  
Patrycjusz Stoklosa
Keyword(s):  
Ct Images ◽  
Dual Source Ct ◽  
Mitral Prosthesis ◽  
Dual Source

Bildrekonstruktion mit vollem „Field-of-View“ in der schnellen dual-source CT

2012 ◽  
Vol 184 (S 01) ◽  
Author(s):  
AH Mahnken ◽  
T Allmendinger ◽  
M Sedlmair ◽  
SD Reinartz ◽  
C Kuhl ◽  
...  
Keyword(s):  
Field Of View ◽  
Dual Source Ct ◽  
Dual Source

Role of cone-beam computed tomography with a large field of view in Goldenhar syndrome

2018 ◽  
Vol 153 (2) ◽  
pp. 269-277 ◽  
Author(s):  
Cosimo Nardi ◽  
Luisa De Falco ◽  
Valeria Selvi ◽  
Chiara Lorini ◽  
Linda Calistri ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Field Of View ◽  
Cone Beam ◽  
Large Field ◽  
Goldenhar Syndrome

MTF characterization in 2D and 3D for a high resolution, large field of view flat panel imager for cone beam CT

2014 ◽  
Author(s):  
Jainil Shah ◽  
Steve D. Mann ◽  
Martin P. Tornai ◽  
Michelle Richmond ◽  
George Zentai
Keyword(s):  
High Resolution ◽  
Cone Beam Ct ◽  
Field Of View ◽  
Cone Beam ◽  
Large Field ◽  
Flat Panel ◽  
2D And 3D

scholarly journals Advanced Noise-Optimized Dual-Energy Virtual Monochromatic Imaging vs. Conventional 120-kVp CT Imaging: Image Quality Assessment

2021 ◽  
Author(s):  
Adnan Honardari ◽  
Ahmad Bitarafan-Rajabi ◽  
Razieh Solgi ◽  
Mahsa Shakeri ◽  
Kiara Rezaei-Kalantari ◽  
...  
Keyword(s):  
Image Quality ◽  
Noise Reduction ◽  
Contrast Material ◽  
Ct Images ◽  
Dual Energy ◽  
Image Noise ◽  
Dual Source Ct ◽  
Ct Number ◽  
Dual Source ◽  
Improvement Ratio

Purpose: This study aimed at evaluating the image quality characteristics of advanced noise-optimized and traditional virtual monochromatic images compared with conventional 120-kVp images from second-generation Dual-Source CT. Materials and Methods: For spiral scans six syringes filled with diluted iodine contrast material (1, 2, 5, 10, 15, 20 mg I/ml) were inserted into the test phantom and scanned with a second-generation dual-source CT in both single-energy (120-kVp) and dual-energy modes. Images set contain conventional single-energy 120-kVp, and virtual monochromatic were reconstructed with energies ranging from 40 to 190-keV in 1-keV steps. An energy-domain noise reduction algorithm was applied and the mean CT number, image noise, and iodine CNR were calculated. Results: The iodine CT number of conventional 120-kVp images compared with monochromatic of 40-, 50-, 60- and 70-keV images showed increase. The improvement ratio of image noise on Advanced Virtual Monochromatic Images (AVMIs) compared with the Traditional Virtual Monochromatic Images (TVMIs) at energies of 40-, 50-, 60, 70-keV was 52.9%, 35.7%, 8.1%, 2.1%, respectively. At AVMIs from 75- to 190-keV, the image noise value was less than conventional 120-kVp images. CNR improvement ratio at 20 mg/ml of iodinated contrast material for TVMIs and AVMIs compared to 120-kVp CT images and AVMIs compared to TVMI was 18.3% and 56.3%, 32.1% respectively. Conclusion: Both TVMIs (in energies ranging from 54 to 71-keV) and AVMIs (in energies ranging from 40 to 74-keV) represent improvement in the iodine contrast-to-noise ratio than conventional 120-kVp CT images for the same radiation dose. Also, AVMIs compared to TVMIs have been obtained considerable noise reduction and CNR improvement for low-energy virtual monochromatic images. In the present study, we show that virtual monochromatic image and its Advanced version (AVMI) may boost the dual-energy CT advantages by providing higher CNR images in the same exposure value compared to routinely acquired single-energy CT images.

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