Zobrazeno 1 - 10
of 62
pro vyhledávání: '"D. Lazos"'
Publikováno v:
Medical physics. 39(6Part6)
Purpose: To evaluate and compare the performance of the imaging systems of two linear accelerators, used in radiation therapy. The study includes the following imaging components: electronic portal imaging device(EPID), kilovoltage projection imaging
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aadb8032b74a4ddbc57d76bcf6a8ffe7
https://pubmed.ncbi.nlm.nih.gov/28517576
https://pubmed.ncbi.nlm.nih.gov/28517576
Autor:
D Lazos, Jeffrey F. Williamson
Publikováno v:
Medical Physics. 39:5639-5651
Purpose: The purposes of this study is to measure the low frequency drop (LFD) of the modulation transfer function (MTF), associated with the long tails of the detector point spread function (PSF) of an on-board flat panel imager and study its impact
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09f9d11955cd123886c86a17bb3a5f54
https://doi.org/10.1118/1.4747260
https://doi.org/10.1118/1.4747260
Publikováno v:
IEEE Transactions on Information Technology in Biomedicine. 4:76-79
A software data generation tool, intended to be used in radiographic applications, has been developed. The application integrates a phantom design module and an imaging simulator. Phantoms can be described either as a set of geometrical objects or vo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8fb3fbcb9835a7e965e37eb8cd55fd5
https://doi.org/10.1109/4233.826863
https://doi.org/10.1109/4233.826863
Autor:
D Lazos, Yuichi Motai, Damodar Pokhrel, Elisabeth Weiss, Jeffrey F. Williamson, Martin J. Murphy, Dorin A. Todor
Publikováno v:
IFMBE Proceedings ISBN: 9783642034725
Purpose: To experimentally validate a new algorithm for reconstructing the 3D positions of implanted brachytherapy seeds from intraoperatively acquired 2D cone-beam CT sinogram projections. Methods and materials: The iterative forward projection matc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f9626fec88578390f076de47657ad3b
https://doi.org/10.1007/978-3-642-03474-9_87
https://doi.org/10.1007/978-3-642-03474-9_87
Publikováno v:
SPIE Proceedings.
Fast and accurate modeling of cone-beam CT (CBCT) x-ray projection data can improve CBCT image quality either by linearizing projection data for each patient prior to image reconstruction (thereby mitigating detector blur/lag, spectral hardening, and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::297ea9872ca7b4b33c68b69e6e5350ce
https://doi.org/10.1117/12.772873
https://doi.org/10.1117/12.772873
Publikováno v:
SPIE Proceedings.
The large contribution of scatter to cone-beam computed tomography (CBCT) x-ray projections significantly degrades image quality, both through streaking and cupping artifacts and by loss of low contrast boundary detectability. The goal of this invest
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3d0c015c285e6e742eefd0f710f2d55a
https://doi.org/10.1117/12.713610
https://doi.org/10.1117/12.713610
Publikováno v:
Computer methods and programs in biomedicine. 70(3)
This paper presents a software simulation package of the entire X-ray projection radiography process including beam generation, absorber structure and composition, irradiation set up, radiation transport through the absorbing medium, image formation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f951b1f4b737fffee23115382b954208
https://pubmed.ncbi.nlm.nih.gov/12581556
https://pubmed.ncbi.nlm.nih.gov/12581556
Autor:
Louis B. Harrison, R. Ambrose, N. Shah, Waleed F. Mourad, Barry S. Rosenstein, Daniel Shasha, Rania A. Shourbaji, P Mobit, J. Dolan, D. Lazos
Publikováno v:
International Journal of Radiation Oncology*Biology*Physics. 84:S357-S358
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e1b76bf520925250c4983a0b0b3b95dc
https://doi.org/10.1016/j.ijrobp.2012.07.944
https://doi.org/10.1016/j.ijrobp.2012.07.944
Publikováno v:
Studies in health technology and informatics. 68
This paper presents a software simulation package of the entire X-ray projection radiography process including beam generation, absorber structure and composition, irradiation set up, radiation transport through the absorbing medium and image formati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::67d7c10d97e44829ea5a955c6bd6c498
https://pubmed.ncbi.nlm.nih.gov/10724913
https://pubmed.ncbi.nlm.nih.gov/10724913
Publikováno v:
Medical Physics. 36:2812-2813
Purpose: In the course of developing projection‐space preprocessing algorithms for improving on‐board CBCTCT number accuracy and uniformity, a persistent, prominent circular band artifact (CBA) with asymmetric illumination shadows was discovered.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42419d0a14a5e49d21475f1cfbe4cd9e
https://doi.org/10.1118/1.3182678
https://doi.org/10.1118/1.3182678