Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Ralph E. Shuping"'
Autor:
Ralph E. Shuping, Philip F. Judy
Publikováno v:
Medical Physics. 5:491-496
Lack of resolution (unsharpness) can reduce contrast in diagnostic radiography if the proper conditions of magnification and unsharpness are met. To describe this phenomenon, a modification of the contrast reduction factor (CRF) was introduced which
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2c2bdab2bb4eecf41e20210b543eb661
https://doi.org/10.1118/1.594459
https://doi.org/10.1118/1.594459
Autor:
Thomas R. Fewell, Ralph E. Shuping
Publikováno v:
Radiology. 128:211-216
X-ray spectra produced by mammographic systems are compared to spectra from conventional diagnostic x-ray systems. Some systems use special anode materials and beam filters to produce x-ray spectra more suitable for mammography. The data show that th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::405175b55a7ec0b0cce3852776318607
https://doi.org/10.1148/128.1.211
https://doi.org/10.1148/128.1.211
Autor:
Robert A. Phillips, Thomas R. Fewell, Ralph E. Shuping, Richard R. Gross, Charles K. Showalter
Publikováno v:
Application of Optical Instrumentation in Medicine VIII.
A significant portion of the dose received by a patient during a radiographic x -ray examination results from absorption of the beam in the various patient support structures through which the beam must pass. New materials are becomingavailable that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89839188beab4bffd54f7aee1c229eb5
https://doi.org/10.1117/12.958932
https://doi.org/10.1117/12.958932
Autor:
Thomas R. Fewell, Ralph E. Shuping
Publikováno v:
Medical physics. 4(3)
A high-purity germanium spectrometer system was used to determine primary x-ray spectra over the 45--90-kVp region. Methods were devised for producing and examining spectra stimulating diagnostic conditions without operating the x-ray generator at hi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3e76431cc3f977945416b6a0b9ec3f60
https://pubmed.ncbi.nlm.nih.gov/882052
https://pubmed.ncbi.nlm.nih.gov/882052
Autor:
Ralph E. Shuping, Philip F. Judy
Publikováno v:
Medical physics. 4(3)
The energy which must be absorbed in a CaWO4 x-ray intensifying screen to produce unit net opetical density on a film has been evaluated by measurement and calculation for a screen-film system over a range of beam qualities (1.4--7.4 mm A1 HVL) spann
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7492d5e24e5aace886933cda1da3ccd6
https://pubmed.ncbi.nlm.nih.gov/882059
https://pubmed.ncbi.nlm.nih.gov/882059
Publikováno v:
Radiation Research. 99:443
A Monte Carlo program was developed which determines the energy response of X-ray detectors of various "nested" sizes simultaneously. Twenty-one planar germanium detectors with cylindrical crystals were chosen, which are commercially available for X-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::562f3654421e1ae34091262a90ccaaa1
https://doi.org/10.2307/3576321
https://doi.org/10.2307/3576321