Zobrazeno 1 - 10
of 64
pro vyhledávání: '"William Swindell"'
Autor:
William Swindell, Steve Webb, Mohammad Amin Mosleh-Shirazi, J R N Symonds-Tayler, Philip M. Evans, Mike Partridge
Publikováno v:
Medical Physics. 25:2333-2346
The design, construction, and performance evaluation of an electronic portal imaging device (EPID) are described. The EPID has the same imaging geometry as the current mirror-based systems except for the x-ray detection stage, where a two-dimensional
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fa7d218a57ac2bbfe073f9d55fbd0319
https://doi.org/10.1118/1.598443
https://doi.org/10.1118/1.598443
Optimization of the scintillation detector in a combined 3D megavoltage CT scanner and portal imager
Publikováno v:
ResearcherID
A parametric study is described leading to the optimization of a custom-made scintillation detector with a relatively high quantum efficiency (QE) for megavoltage photons and light output toward a remote lens. This detector allows low-dose portal ima
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::34d36b0c7925bdf35cdf14ac6f8994ff
https://doi.org/10.1118/1.598377
https://doi.org/10.1118/1.598377
Publikováno v:
ResearcherID
A method of using electronic portal imaging (EPI) for transit dosimetry is described. In this method, a portal image of the treatment field is first aligned with a digitally reconstructed radiograph (DRR) to geometrically relate the computed tomograp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87aadf67ce8710a762ab042663c27f1c
https://doi.org/10.1118/1.597719
https://doi.org/10.1118/1.597719
Publikováno v:
Medical Physics. 22:1405-1411
We have studied the usefulness of both pre‐ and post‐ADC frame summing for the purpose of reducing the effect of quantum noise and digitizationnoise in portal imaging systems. The study is based on the fluorescent‐screen video‐camera type of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e15e9f09b3ca0a95c1302351f7eb82e7
https://doi.org/10.1118/1.597618
https://doi.org/10.1118/1.597618
Publikováno v:
Radiotherapy and Oncology. 35:151-160
A portal imaging system has been used, in conjunction with a movie measurement technique to measure set-up errors for 15 patients treated with radiotherapy of the pelvis and for 12 patients treated with radiotherapy of the brain. The pelvic patients
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20545a53616259dd4bf20cd0ffba9507
https://doi.org/10.1016/0167-8140(95)01536-p
https://doi.org/10.1016/0167-8140(95)01536-p
Publikováno v:
Physics in Medicine and Biology. 39:2091-2098
In this note it is shown that for a fixed integral dose to the planning target volume, the highest tumour control probability (TCP) arises when the dose is spatially uniform. This 'uniform dose theorem' is proved both for (i) a specific TCP model bas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6af8134008f840b4b24509276c9cf958
https://doi.org/10.1088/0031-9155/39/11/018
https://doi.org/10.1088/0031-9155/39/11/018
Publikováno v:
The British Journal of Radiology. 66:833-838
The problem of using information from the analysis of megavoltage images to adjust patient set-up has been addressed. In the case of rotational corrections it has been assumed that the treatment head is to be adjusted, although for gantry angles of 0
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::19fc6ccdfb2e660e476bcdb9f3d5f254
https://doi.org/10.1259/0007-1285-66-789-833
https://doi.org/10.1259/0007-1285-66-789-833
Autor:
R. Coles, Christine Rawlings, J. Dyer, William Swindell, E. J. Morton, J. Gildersleve, Z. R. Xiao, M. Ferraro, Philip M. Evans
Publikováno v:
The British Journal of Radiology. 65:701-709
In this paper we describe software facilities for enabling patient positioning studies using the megavoltage imaging system developed at the Royal Marsden Hospital and Institute of Cancer Research. The study focuses on the use of the system for three
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b8f86fd85c0e387f158b692d18875dc
https://doi.org/10.1259/0007-1285-65-776-701
https://doi.org/10.1259/0007-1285-65-776-701
Publikováno v:
Medical Physics. 18:855-866
This study investigates factors associated with the imaging of a patient using a high‐energy radiotherapy treatment beam. Both single‐stage (e.g., solid‐state detector) and two‐stage (e.g., scintillation screen plus TV) systems are considered
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::da33cdde5424e0c751880128077379e9
https://doi.org/10.1118/1.596735
https://doi.org/10.1118/1.596735
Publikováno v:
The British Journal of Radiology. 64:747-750
During the simulation of an external-beam X-ray radiotherapy treatment, a low-energy X-ray source (tube voltage ≈ 50–100 kVp) is used to irradiate the patient and the transmitted intensities are recorded either by X-ray film or an X-ray image int
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::070eaa627bad8a2aed73ab05815229f9
https://doi.org/10.1259/0007-1285-64-764-747
https://doi.org/10.1259/0007-1285-64-764-747