Results 41 to 50 of about 177,511 (317)

3D Analytic Cone-Beam Reconstruction for Multiaxial CT Acquisitions

International Journal of Biomedical Imaging, 2009
A conventional 3rd generation Computed Tomography (CT) system with a single circular source trajectory is limited in terms of longitudinal scan coverage since extending the scan coverage beyond 40 mm results in significant cone-beam artifacts.
Zhye Yin, Bruno De Man, Jed Pack
doaj   +1 more source

Geometry Calibration of a Modular Stereo Cone-Beam X-ray CT System

Journal of Imaging, 2021
Compared to single source systems, stereo X-ray CT systems allow acquiring projection data within a reduced amount of time, for an extended field-of-view, or for dual X-ray energies. To exploit the benefit of a dual X-ray system, its acquisition geometry
Van Nguyen, Joaquim G. Sanctorum, Sam Van Wassenbergh, Joris J. J. Dirckx, Jan Sijbers, Jan De Beenhouwer   +5 more
doaj   +1 more source

A Hybrid Approach to Reduce Cone-Beam Artifacts for a Circular Orbit Cone-Beam CT System

IEEE Access, 2018
In a cone-beam computed tomography (CT) system, the Feldkamp, Davis, and Kress (FDK) algorithm produces cone-beam artifacts due to insufficient object sampling in the missing cone region of frequency space.
Shinkook Choi, Jinsung Kim, Jongduk Baek
doaj   +1 more source

Visual enhancement of Cone-beam CT by use of CycleGAN.

Medical Physics (Lancaster), 2019
PURPOSE Cone-beam computed tomography (CBCT) offers advantages over conventional fan-beam CT in that it requires a shorter time and less exposure to obtain images.
S. Kida, S. Kaji, K. Nawa, T. Imae, T. Nakamoto, S. Ozaki, T. Ohta, Y. Nozawa, K. Nakagawa   +8 more
semanticscholar   +1 more source

Feasibility of MV CBCT-based treatment planning for urgent radiation therapy: dosimetric accuracy of MV CBCT-based dose calculations. [PDF]

, 2015
Unlike scheduled radiotherapy treatments, treatment planning time and resources are limited for emergency treatments. Consequently, plans are often simple 2D image-based treatments that lag behind technical capabilities available for nonurgent ...
Fogh, Shannon E, Held, Mareike, Morin, Olivier, Pouliot, Jean, Sneed, Penny K   +4 more
core   +1 more source

Bone Densitometric Analysis using Cone Beam Computed Tomography (Cone Beam CT) and Computed Tomography (CT): Establishing the Correlation between Predicted and Actual Values

Advanced Biomedical Research
Background: One of the major drawbacks of cone beam computed tomography (cone beam CT) is that unlike CT, the gray density values obtained from cone beam CT are relative, and not absolute as obtained in the case of CT.
Rashmit Kumar, Kurian Punnoose, Meenakumari Chikkanna, Srikanth Gunturu, Mosa Mohammad Alrifai, Abdulghani Saeed Al Zahrani, J. Suresh Babu, C. Swarnalatha, Abhishek Singh Nayyar   +8 more
doaj   +1 more source

Concrescence: Cone-Beam Computed Tomography Imaging Perspective

Case Reports in Dentistry, 2016
Concrescence is a form of twinning, formed by the confluence of cementum of two teeth at the root level. The diagnosis of concrescence has largely relied on the conventional 2D imaging.
Ali Zakir Syed, LeelaSubhashini Choudary Alluri, Dhiraj Mallela, Troy Frazee   +3 more
doaj   +1 more source

Improved adaptive radiotherapy to adjust for anatomical alterations during curative treatment for locally advanced lung cancer

Physics and Imaging in Radiation Oncology, 2021
Anatomical changes during chemoradiation for lung cancer may decrease dose to the target or increase dose to organs at risk. To assess our ability to identify clinically significant anatomical alterations, we followed 67 lung cancer patients by daily ...
Maria Moksnes Bjaanæs, Erlend Peter Skaug Sande, Øyvind Loe, Christina Ramberg, Tove Mette Næss, Andreas Ottestad, Lotte V. Rogg, Jørund Graadal Svestad, Vilde Drageset Haakensen   +8 more
doaj   +1 more source

Weight-bearing cone-beam CT

Skeletal radiology, 2022
Weight bearing CT (WBCT) of the lower extremity is gaining momentum in evaluation of the foot/ankle and knee. A growing number of international studies use WBCT, which is promising for improving our understanding of anatomy and biomechanics during natural loading of the lower extremity. However, we believe there is risk of excessive enthusiasm for WBCT
Brinch, Signe, Wellenberg, Ruud H. H., Boesen, Mikael Ploug, Maas, Mario, Johannsen, Finn Elkjær, Nybing, Janus Uhd, Turmezei, Tom, Streekstra, Geert J., Hansen, Philip   +8 more
openaire   +1 more source

C-arm orbits for metal artifact avoidance (MAA) in cone-beam CT

Physics in Medicine and Biology, 2020
Metal artifacts present a challenge to cone-beam CT (CBCT) image-guided surgery, obscuring visualization of metal instruments and adjacent anatomy—often in the very region of interest pertinent to the imaging/surgical tasks. We present a method to reduce
Pengwei Wu, N. Sheth, A. Sisniega, A. Uneri, R. Han, R. Vijayan, Prasad Vagdargi, B. Kreher, H. Kunze, G. Kleinszig, S. Vogt, Sheng-Fu L Lo, Nicholas Theodore, J. Siewerdsen   +13 more
semanticscholar   +1 more source