Zobrazeno 1 - 10
of 16
pro vyhledávání: '"John L. Couch"'
Publikováno v:
Medical Physics. 9:722-732
The artifact in computed tomography (CT) images due to cyclic projection errors, such as errors due to periodic fluctuations in x-ray intensity, is derived and verified by computer simulation. Depending upon the relative phase of the error between pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3b524562cd5691cd048935a45b7b725
https://doi.org/10.1118/1.595118
https://doi.org/10.1118/1.595118
Autor:
Dennis L. Parker, Kristian R. Peschmann, Edmund C. Wang, Vernon Smith, John L. Couch, Massao Jimbo
Publikováno v:
Medical Physics. 9:531-539
The mathematical coupling of various types of measurement errors to image artifacts in conventional computed tomography geometries is derived. Primarily treated are errors which occur at a fixed radius, simple harmonic error fluctuations, and random
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f6fc7798269a1ecd64b5220b39e7e575
https://doi.org/10.1118/1.595105
https://doi.org/10.1118/1.595105
Publikováno v:
Computers and Biomedical Research. 13:333-349
A complete system of hardware and software is described, which permits determination of the three-dimensional shape of animal cell colonies. The cells are photographed by light scattered through an angle of approximately 45° during passage through t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f693eeb2e72716f334315f8c1aeec41
https://doi.org/10.1016/0010-4809(80)90026-9
https://doi.org/10.1016/0010-4809(80)90026-9
Autor:
Philip C. Hanawalt, John L. Couch
Publikováno v:
Biochemical and Biophysical Research Communications. 29:779-784
Mutants of E. coli blocked in normal semiconservative DNA replication above 42°C have been isolated by Bonhoeffer and Schaller (1965) and by Rasmussen and Weywadt (1967) . Bonhoeffer (1966) found that stimulated incorporation of P32 into DNA occurre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::589c084933890d6adaa36649941fc848
https://doi.org/10.1016/0006-291x(67)90287-2
https://doi.org/10.1016/0006-291x(67)90287-2
Autor:
Hiroaki Nakayama, John L. Couch
Publikováno v:
Journal of Bacteriology. 114:228-232
Thymineless death has been studied in four different Thy(-) strains of Escherichia coli by using various assay methods including conventional plating techniques as well as one performed entirely in liquid medium. Plating on L agar resulted in a great
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03ee84b775d7de7ca46a1e5d2ab2131a
https://doi.org/10.1128/jb.114.1.228-232.1973
https://doi.org/10.1128/jb.114.1.228-232.1973
Autor:
William B. Herrmannsfeldt, Sandy Napel, Roy E. Rand, Dennis L. Parker, Douglas P. Boyd, John L. Couch, Kristian R. Peschmann
Publikováno v:
SPIE Proceedings.
During the first decade of CT scanner development, continuous progress has been made in scanning speed and resolution. This trend is expected to continue in the next decade as new source and detector technologies are introduced. CT has the theoretica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eace6c897b17a69f878acaf481f3a4c1
https://doi.org/10.1117/12.934506
https://doi.org/10.1117/12.934506
Publikováno v:
SPIE Proceedings.
The sampling geometry for conventional, multidetector, computed tomography is illustrated in terms of the Radon transformation for both rotate-rotate (3rd generation fan beam) and rotate-stationary (4th generation fan beam) scanners. By deriving an e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::999f20c309eb7653a0a90c939fdf253e
https://doi.org/10.1117/12.931820
https://doi.org/10.1117/12.931820
Publikováno v:
SPIE Proceedings.
Limited-angle computed tomography was studied in a project to develop algorithms for a limited-angle scanner. Both the ART algorithm and an orthogonal function algorithm were investigated. The artifact produced by the different methods was very simil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::223a4c2405c7e36c26037fa48714b2b0
https://doi.org/10.1117/12.934510
https://doi.org/10.1117/12.934510
Autor:
Douglas P. Boyd, Sandy Napel, Sholom M. Ackelsberg, Roy E. Rand, Kristian R. Peschmann, Robert G. Gould, John L. Couch, Robert Alei
Publikováno v:
Applied optics. 24(23)
Lacking temporal resolution prevents routine application of computed tomography (CT) for diagnosis of the heart and blood flow. On the other hand, diseases of the heart and vessels pose the number one health problem in the western world. Many researc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fee576741a31eba4f569463e2d3a156f
https://pubmed.ncbi.nlm.nih.gov/18224161
https://pubmed.ncbi.nlm.nih.gov/18224161
Autor:
John L. Couch, Philip C. Hanawalt
Publikováno v:
Analytical biochemistry. 41(1)
A method has been developed for quantitatively estimating the contribution of pools of thymine derivatives to the DNA synthesized by bacteria grown in the presence of the analog 5-bromouracil. A 3′-nucleotide digest of the DNA synthesized during a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6702e29c4975396ff9dccb33de6e0ce3
https://pubmed.ncbi.nlm.nih.gov/5578553
https://pubmed.ncbi.nlm.nih.gov/5578553