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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

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A Comparison of Mammographic X-Ray Spectra

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

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Dose Reduction Potential Of Carbon-Fiber Material In Diagnostic Radiology

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

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Photon energy distribution of some typical diagnostic x-ray beams

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

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Investigation of energy responses of germanium detectors and correction of measured spectra by means of Monte Carlo simulation

Autor: H P, Chan, C T, Chen, K, Doi, T R, Fewell, R E, Shuping

Publikováno v: Radiation research. 99(3)

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=pmid________::339f2fb3fa1687846329d102c0735fcc
https://pubmed.ncbi.nlm.nih.gov/6473707

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