Space carving and filtered back-projection as preconditioners for proton computed tomography reconstruction

2012 ◽  
Author(s):  
Blake Schultze ◽  
Micah Witt ◽  
Keith E. Schubert ◽  
Robert F. Hurley ◽  
Vladimir Bashkirov ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Back Projection ◽  
Filtered Back Projection ◽  
Space Carving ◽  
Proton Computed Tomography ◽  
Tomography Reconstruction ◽  
Computed Tomography Reconstruction

scholarly journals Evaluation and Clinical Application of a Commercially Available Iterative Reconstruction Algorithm for CBCT-Based IGRT

2019 ◽  
Vol 18 ◽  
pp. 153303381882305 ◽  
Author(s):  
Weihua Mao ◽  
Chang Liu ◽  
Stephen J. Gardner ◽  
Farzan Siddiqui ◽  
Karen C. Snyder ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Quality Assurance ◽  
Image Quality ◽  
Cone Beam Computed Tomography ◽  
Reconstruction Algorithm ◽  
Cone Beam ◽  
Back Projection ◽  
Filtered Back Projection ◽  
Tomography Reconstruction ◽  
Computed Tomography Reconstruction

Purpose: We have quantitatively evaluated the image quality of a new commercially available iterative cone-beam computed tomography reconstruction algorithm over standard cone-beam computed tomography image reconstruction results. Methods: This iterative cone-beam computed tomography reconstruction pipeline uses a finite element solver (AcurosCTS)-based scatter correction and a statistical (iterative) reconstruction in addition to a standard kernel-based correction followed by filtered back-projection-based Feldkamp-Davis-Kress cone-beam computed tomography reconstruction. Standard full-fan half-rotation Head, half-fan full-rotation Head, and standard Pelvis cone-beam computed tomography protocols have been investigated to scan a quality assurance phantom via the following image quality metrics: uniformity, HU constancy, spatial resolution, low contrast detection, noise level, and contrast-to-noise ratio. An anthropomorphic head phantom was scanned for verification of noise reduction. Clinical patient image data sets for 5 head/neck patients and 5 prostate patients were qualitatively evaluated. Results: Quality assurance phantom study results showed that relative to filtered back-projection-based cone-beam computed tomography, noise was reduced from 28.8 ± 0.3 HU to a range between 18.3 ± 0.2 and 5.9 ± 0.2 HU for Full-Fan Head scans, from 14.4 ± 0.2 HU to a range between 12.8 ± 0.3 and 5.2 ± 0.3 HU for Half-Fan Head scans, and from 6.2 ± 0.1 HU to a range between 3.8 ± 0.1 and 2.0 ± 0.2 HU for Pelvis scans, with the iterative cone-beam computed tomography algorithm. Spatial resolution was marginally improved while results for uniformity and HU constancy were similar. For the head phantom study, noise was reduced from 43.6 HU to a range between 24.8 and 13.0 HU for a Full-Fan Head and from 35.1 HU to a range between 22.9 and 14.0 HU for a Half-Fan Head scan. The patient data study showed that artifacts due to photon starvation and streak artifacts were all reduced, and image noise in specified target regions were reduced to 62% ± 15% for 10 patients. Conclusion: Noise and contrast-to-noise ratio image quality characteristics were significantly improved using the iterative cone-beam computed tomography reconstruction algorithm relative to the filtered back-projection-based cone-beam computed tomography method. These improvements will enhance the accuracy of cone-beam computed tomography-based image-guided applications.

Two-dimensional noise reconstruction in proton computed tomography using distance-driven filtered back-projection of simulated projections

2018 ◽  
Vol 63 (21) ◽  
pp. 215009 ◽  
Author(s):  
Martin Rädler ◽  
Guillaume Landry ◽  
Simon Rit ◽  
Reinhard W Schulte ◽  
Katia Parodi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Two Dimensional ◽  
Back Projection ◽  
Filtered Back Projection ◽  
Proton Computed Tomography

scholarly journals Aneurysm Arising at the Origin of a Duplicated Middle Cerebral Artery

2021 ◽  
pp. 446-450
Author(s):  
Jean Roch Alliez ◽  
Luis Manera
Keyword(s):  
Computed Tomography ◽  
Subarachnoid Haemorrhage ◽  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
World Federation ◽  
Treatment Procedure ◽  
3D Computed Tomography ◽  
Ruptured Aneurysms ◽  
Tomography Reconstruction ◽  
Computed Tomography Reconstruction

A duplicated middle cerebral artery (DMCA) is a common anomaly. However, aneurysms arising from the origin of a DMCA are extremely rare. A 22-year-old female was admitted to our hospital with a World Federation of Neurosurgical Societies grade 2 subarachnoid haemorrhage. Four-vessel angiography revealed a DMCA and an aneurysm arising from the origin of this artery. The aneurysm was successfully treated by embolization, and the patient was discharged 2 weeks later. Ruptured aneurysms arising from the origin of a DMCA can be successfully treated by embolization. These aneurysms are small and 3D-computed tomography reconstruction is mandatory to detect them. It is important to preserve the DMCA during the treatment procedure.

scholarly journals Temporal sparsity exploiting nonlocal regularization for 4D computed tomography reconstruction

2016 ◽  
Vol 24 (2) ◽  
pp. 207-219 ◽  
Author(s):  
Daniil Kazantsev ◽  
Enyu Guo ◽  
Anders Kaestner ◽  
William R. B. Lionheart ◽  
Julian Bent ◽  
...  
Keyword(s):  
Computed Tomography ◽  
4D Computed Tomography ◽  
Tomography Reconstruction ◽  
Computed Tomography Reconstruction ◽  
Nonlocal Regularization
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