Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Huaiqun Guan"'
Publikováno v:
International Journal of Biomedical Imaging, Vol 2013 (2013)
Tetrahedron beam computed tomography (TBCT) performs volumetric imaging using a stack of fan beams generated by a multiple pixel X-ray source. While the TBCT system was designed to overcome the scatter and detector issues faced by cone beam computed
Externí odkaz:
https://doaj.org/article/99a86522ca4b42d1a1d499bd7acc87ea
Autor:
Kim, Joshua1,2 (AUTHOR), Huaiqun Guan3 (AUTHOR), Gersten, David4 (AUTHOR), Tiezhi Zhang1,2,4 (AUTHOR) tiezhi.zhang@beaumont.edu
Publikováno v:
International Journal of Biomedical Imaging. 2013, p1-14. 14p. 6 Black and White Photographs, 1 Diagram, 5 Graphs.
Publikováno v:
Medical Physics. 39:5111-5117
R600 phantom and a head phantom were acquired by a Varian 2100EX LINAC with a low-Z (Al) target and low energy x-ray beam (2.5 MeV) at a low-dose level and at a high-dose level. The projections were then processed by minimizing the PWLS objective fun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::29a63c203dbf1956d8099686713b4196
https://doi.org/10.1118/1.4737116
https://doi.org/10.1118/1.4737116
Publikováno v:
Medical Physics. 38:4066-4072
Purpose: A statistical projection restoration algorithm based on the penalized weighted least-squares (PWLS) criterion can substantially improve the image quality of low-dose CBCTimages. The performance of PWLS is largely dependent on the choice of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::07c595581602f0320e3d5e39b35c0fe4
https://doi.org/10.1118/1.3600696
https://doi.org/10.1118/1.3600696
Autor:
Huaiqun Guan
Publikováno v:
Medical Physics. 37:3738-3743
Purpose To propose an attenuation integral digital imaging (AIDI) technique for the treatment portal verification of conventional and intensity-modulated radiotherapy (IMRT). Methods In AIDI technique, an open in air fluence image Io and a patient fl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1cc692c8903d4da5284e4e474bfc1ec2
https://doi.org/10.1118/1.3447729
https://doi.org/10.1118/1.3447729
Publikováno v:
Medical Physics. 37:244-248
Purpose: Cone beam CT is increasingly being used for daily patient positioning verification during radiation therapy treatments. The daily use of CBCT could lead to accumulated patient doses higher than the older technique of weekly portal imaging. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4d37cbe5bd5ec947693434e742d893c9
https://doi.org/10.1118/1.3271582
https://doi.org/10.1118/1.3271582
Autor:
Huaiqun Guan, Hang Dong
Publikováno v:
Physics in Medicine and Biology. 54:6239-6250
This study is to evaluate the dose calculation accuracy using Varian's cone-beam CT (CBCT) for pelvic adaptive radiotherapy. We first calibrated the Hounsfield Unit (HU) to electron density (ED) for CBCT using a mini CT QC phantom embedded into an IM
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c522c3b62aa5d313cf712751fc31b7a
https://doi.org/10.1088/0031-9155/54/20/013
https://doi.org/10.1088/0031-9155/54/20/013
Publikováno v:
Medical Physics. 30:2675-2685
A fuzzy logic technique was applied to optimize the weighting factors in the objective function of an inverse treatment planning system for intensity-modulated radiation therapy (IMRT). Based on this technique, the optimization of weighting factors i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3f2b45df792801b874137606f38070e4
https://doi.org/10.1118/1.1600739
https://doi.org/10.1118/1.1600739
Publikováno v:
IEEE Transactions on Medical Imaging. 18:355-358
The authors investigated the use of the kinestatic charge detector (KCD) combined with the multilevel scheme algebraic reconstruction technique (MLS-ART) for X-ray computer tomography (CT) reconstruction. The KCD offers excellent detective quantum ef
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d583b346650a30fa2b0aeb8d184f2fd
https://doi.org/10.1109/42.768844
https://doi.org/10.1109/42.768844
Autor:
Yunping Zhu, Huaiqun Guan
Publikováno v:
Physics in Medicine and Biology. 43:2925-2937
Although electronic portal imaging devices (EPIDs) are efficient tools for radiation therapy verification, they only provide images of overlapped anatomic structures. We investigated using a fluorescent screen/CCD-based EPID, coupled with a novel mul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f10351fc0d40d7884bd26f2c8f0341e8
https://doi.org/10.1088/0031-9155/43/10/018
https://doi.org/10.1088/0031-9155/43/10/018