Results 71 to 80 of about 1,779,765 (198)

Calcul de dose à partir d’images Cone Beam CT : état de l’art

, 2018
National audienceIn external beam radiotherapy, the dose planning is currently based on computed tomography (CT) images. A relation between Hounsfield numbers and electron densities (or mass densities) is necessary for dose calculation taking ...
Lafond, C., Henry, O., M. Céleste, N. Périchon, Acosta, Oscar, Simon, A., A. Simon, Barateau, A., O. Henry, Céleste, M., Périchon, N., S. Couespel, R. de Crevoisier, C. Lafond, Couespel, S., A. Barateau, O. Acosta, Crevoisier, R., De, Crevoisier, R.,   +18 more
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Fast 4D cone-beam CT from 60 s acquisitions

Physics and Imaging in Radiation Oncology, 2018
Background & purpose: Four dimensional Cone beam CT (CBCT) has many potential benefits for radiotherapy but suffers from poor image quality, long acquisition times, and/or long reconstruction times. In this work we present a fast iterative reconstruction
David C. Hansen, Thomas Sangild Sørensen   +1 more
doaj   +1 more source

FDK Half-Scan with a Heuristic Weighting Scheme on a Flat Panel Detector-Based Cone Beam CT (FDKHSCW)

International Journal of Biomedical Imaging, 2006
A cone beam circular half-scan scheme is becoming an attractive imaging method in cone beam CT since it improves the temporal resolution. Traditionally, the redundant data in the circular half-scan range is weighted by a central scanning plane-dependent ...
Dong Yang, Ruola Ning
doaj   +1 more source

Measurement of the MTF of a Cone-Beam Breast Computed Tomography laboratory scanner.

, 2009
In the framework of the realization of dedicated Cone-Beam Breast Computed Tomography (CBBCT) apparatus we report the MTF characterization of our prototype having the best performance in terms of detector pixel size and X ray focal spot than any other ...
RUSSO, PAOLO, METTIVIER, GIOVANNI
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Cone Beam CT Study of Temporal Crest Canal

Journal of Dentistry, 2018
Statement of the Problem: It is crucial for clinicians to be certain about the location of mandibular canal and determine any anatomical variants relevant to it. The temporal crest canal (TCC) is a rare anatomical variant of mandibular canal that lack of
Mahvash Hasani , Shoaleh Shahidi , Shahrzad Alsadat Shamszade   +2 more
doaj  

Suppression Method for Cone-Beam CT Artifact Based on FDK Compensation and Dual-Source Weighting

CT Lilun yu yingyong yanjiu
The Feldkamp-Davis-Kress (FDK) algorithm has the advantages of a simple structure, fast calculation speed, and high reconstruction quality, and it remains the mainstream algorithm for cone-beam computed tomography (CBCT) analytical reconstruction ...
Ronglin XIANG, Li ZHANG
doaj   +1 more source

GPU-Based 3D Cone-Beam CT Image Reconstruction for Large Data Volume

International Journal of Biomedical Imaging, 2009
Currently, 3D cone-beam CT image reconstruction speed is still a severe limitation for clinical application. The computational power of modern graphics processing units (GPUs) has been harnessed to provide impressive acceleration of 3D volume image ...
Xing Zhao, Jing-jing Hu, Peng Zhang
doaj   +1 more source

Hybrid operating room with ceiling mounted imaging system assisted pre-operative and intra-operative lung nodule localization for thoracoscopic resections: a 5-year case series

Journal of Cardiothoracic Surgery
Background Video-assisted thoracoscopic (VATS) lung resections are increasingly popular and localization techniques are necessary to aid resection. We describe our experience with hybrid operating room (OR) cone-beam computed tomography (CT) assisted pre-
Audrey Qi Xin Chia, Apoorva Gogna, Angela Maria Takano Pena, Vishnu Vemula Sri Sai, Sivanathan Chandramohan, Shaun Ju Min Xavier Chan, Boon-Hean Ong   +6 more
doaj   +1 more source

Triple-source saddle-curve cone-beam photon counting CT image reconstruction: A simulation study

Zeitschrift für Medizinische Physik
Purpose: The most common detector material in the PC CT system, cannot achieve the best performance at a relatively higher photon flux rate. In the reconstruction view, the most commonly used filtered back projection, is not able to provide sufficient ...
Lin Xin, Weihai Zhuo, Qian Liu, Tianwu Xie, Habib Zaidi   +4 more
doaj   +1 more source

Spiral Cone-beam CT - Successes with Spiral Scans

, 2014
X-ray computed tomography (CT) is instrumental in medicine, industry and homeland security, which depicts internal structures of an object from its shadows projected in a fan-beam or cone-beam from an x-ray source along a appropriate trajectory.
Wang, Ge
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