Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Theodore Villafana"'
Publikováno v:
Journal of Nuclear Cardiology. 15:587-594
The teaching of basic science with regard to physics, instrumentation, and radiation safety has been part of nuclear cardiology training since its inception. Although there are clear educational and quality rationale for such, regulations associated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0710ca10a42111767e75e3ba0de40c7
https://doi.org/10.1016/j.nuclcard.2008.05.008
https://doi.org/10.1016/j.nuclcard.2008.05.008
Autor:
Rosemary Gallagher, Patrick N. McDermott, James Vandergrift, Lincoln B. Hubbard, Robert D. Zwicker, Cynthia H. McCollough, Joel E. Gray, Almon S. Shiu, J. Ed Barnes, Arthur Olson, Jeff Kotzan, Bruce J. Gerbi, James Willis, Gary T. Barnes, Jerome A. Meli, Mark S. Rzeszotarski, Marleen M. Moore, Adel A. Mustafa, Michael Dennis, Edward Manny, Arthur Pinkerton, Theodore Villafana, Edward L. Nickoloff, Jonathan Law, Eric E. Klein, Samuel C. Hill, John R. Glover, Ted Fields, Louis Levy, Maynard High, Alain L. Fymat, Phillip C. Berry, Joseph Arcarese, David S. Marsden, David Marsden
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2d2d0e1c34f77ce3658319d6046ab9ca
https://doi.org/10.37206/63
https://doi.org/10.37206/63
Autor:
Edward L. Nickoloff, Gerald Cohen, Caridad Borras, Robert A. Jucius, R. Edward Hendrick, Thomas N. Hangartner, Keith J. Strauss, Robert K. Cacak, Raymond P. Rossi, Robert J. Kriz, Thomas J. Beck, Theodore Villafana, Lawrence N. Rothenberg, Joel E. Gray, Pei-Jan Paul Lin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d21cf7e9a0e995a8463e55ac295029ac
https://doi.org/10.37206/38
https://doi.org/10.37206/38
Publikováno v:
Medical Physics. 9:121-130
There is a major gap in backscatter information for diagnostic x-ray beams. Such information is increasingly needed for dose measurements and calculations, as well as for designing devices and techniques. We have therefore carried out measurements on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec91e0226a4f4b844a47b619389e307a
https://doi.org/10.1118/1.595140
https://doi.org/10.1118/1.595140
Publikováno v:
Radiology. 130:477-484
A method is described for rapid and accurate computation of diagnostic x-ray spectra. Accuracy limitations of Kramers' equation are overcome by providing intensity correction factors derived from published measured data. Use of a parameter based on t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32dad3ad8812beb7dfc0d76ab5978a10
https://doi.org/10.1148/130.2.477
https://doi.org/10.1148/130.2.477
Autor:
Theodore Villafana
Publikováno v:
Acta Radiologica: Therapy, Physics, Biology. 16:281-288
The modulation transfer function of radiologic imaging systems is commonly obtained by determining the line spread function (LSF) of the system and computing its Fourier transform. Ideally, LSF should be obtained with infinitesimally narrow slits. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f8b926b03e8dc565a854d7083c49cef6
https://doi.org/10.3109/02841867709133948
https://doi.org/10.3109/02841867709133948
Publikováno v:
Investigative Radiology. 13:291-297
A new breast phantom has been designed for use in evaluating mammographic system performance. This phantom incorporates simulated calcifications and fibrillar objects in fat, of graded size, to permit measurements of detail visibility. A special meth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::371ca09325ddcb70c4a64af7724cbb20
https://doi.org/10.1097/00004424-197807000-00004
https://doi.org/10.1097/00004424-197807000-00004
Autor:
Theodore Villafana
Publikováno v:
Medical Physics. 5:34-36
Microdensitometers have both spatial and temporal finite responses which may lead to degradation in images being analyzed. These responses may be quantitated in terms of spatial and temporal modulation transfer functions (MTFs). The temporal response
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0c8877c3ee03e1d2ebf9a5882c336fe
https://doi.org/10.1118/1.594402
https://doi.org/10.1118/1.594402
Publikováno v:
Journal of computer assisted tomography. 2(3)
A device was designed that makes possible direct anatomical correlation between the computed tomography scan and radiographic scout films. The acrylic-air groove approach used here eliminates the possibility of producing image degrading artifacts as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65ead4101ec27762be6fac19e1201e06
https://pubmed.ncbi.nlm.nih.gov/263502
https://pubmed.ncbi.nlm.nih.gov/263502
Publikováno v:
Radiology. 150(2)
Estimates of breast dose per view are needed for selection of mammographic techniques and verification of their proper use. However, accurate dosimetry requires standardization of both the methodology and the assumed breast composition. Because sever
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ef3a106d3d4020c0ae4328ca76b0c29
https://pubmed.ncbi.nlm.nih.gov/6691119
https://pubmed.ncbi.nlm.nih.gov/6691119