Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Charles P. Herbst"'
Autor:
Charles Petrus Herbst, Gerhard H Fick
Publikováno v:
South African Journal of Radiology, Vol 16, Iss 2, Pp 50-54 (2012)
Lately, South Africa’s regulatory framework for electromagnetic medical devices has come under considerable pressure. In this article the legislative framework and regulatory infrastructure are scrutinized, by looking at how the legislature has giv
Externí odkaz:
https://doaj.org/article/1de0668fb72646919f50d01012e44c96
Autor:
A. van Aswegen, H. du Raan, Mattheus G. Lötter, Charles P. Herbst, J.A. van Staden, William Rae
Publikováno v:
Physica Medica. 27:11-20
Transmission sources used for image attenuation correction, allowing image quantification, are collimated to reduce scatter. We propose the same effect can be achieved for an uncollimated source by increasing source to patient distance. The aim was t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::48753c2336144dd3b904e81532425bc8
https://doi.org/10.1016/j.ejmp.2010.01.004
https://doi.org/10.1016/j.ejmp.2010.01.004
Publikováno v:
Physics in Medicine and Biology. 52:N329-N337
This note proposes the use of a standard inkjet printer to produce radioactive (99m)Tc phantoms that can be used for routine quality control of gamma cameras. The amount of activity that will be deposited on paper per unit area was predicted and comp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df7e2c0b086322062c75c7898d21b1ff
https://doi.org/10.1088/0031-9155/52/15/n02
https://doi.org/10.1088/0031-9155/52/15/n02
Autor:
Charles P. Herbst, Anita Conradie
Publikováno v:
Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB). 32(10)
As hospitalized neonates are radiosensitive and often require numerous X-rays, institutions should investigate the optimal beam parameter combinations to deliver diagnostically acceptable quality images at the lowest possible entrance surface dose (E
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb2899f0e84e51368ea7cd17483d5984
https://pubmed.ncbi.nlm.nih.gov/27542577
https://pubmed.ncbi.nlm.nih.gov/27542577
Autor:
Charles P. Herbst, A. C. Otto, Mattheus G. Lötter, A. van Aswegen, T. N. van der Walt, H. du Raan, P. D. du Toit
Publikováno v:
Medical Physics. 27:1523-1534
Image degradation during single photon emission computed tomography (SPECT) due to attenuation and Compton scatter of photons can cause clinical image artifacts and will also result in inaccurate quantitative data. Therefore attenuation correction me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c1eb61edc738e3ae78d5d512d4d8c30
https://doi.org/10.1118/1.599018
https://doi.org/10.1118/1.599018
Autor:
H.C. Oosthuizen, Charles P. Herbst
Publikováno v:
Physica Medica. 31:S8-S9
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::588fc941f1581d1a4ab49aef0a1d0593
https://doi.org/10.1016/j.ejmp.2015.07.115
https://doi.org/10.1016/j.ejmp.2015.07.115
Autor:
Mattheus G. Lötter, P. Hendrik Pretorius, Andries van Aswegen, Hanlie Naudé, Charles P. Herbst
Publikováno v:
Physics in Medicine and Biology. 41:1059-1066
Several methods exist to eliminate the contribution of scattered photons during imaging. One of these, the channel ratio (CR) scatter correction technique, uses the change in the ratio of counts from two symmetrical adjacent energy windows straddling
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8209cfabdbece5700aa1ffb4acf8c0a6
https://doi.org/10.1088/0031-9155/41/6/009
https://doi.org/10.1088/0031-9155/41/6/009
Publikováno v:
South African Journal of Radiology, Vol 13, Iss 4 (2009)
SA Journal of Radiology; Vol 13, No 4 (2009)
SA Journal of Radiology; Vol 13, No 4 (2009)
Background. Mammography aims to obtain mammograms of the best possible image quality with the least possible radiation dose. Theoretically, an increase in breast compression gives a reduction in thickness without changing the density, resulting in im
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9658c98df5ed02d892701b237f965df6
https://sajr.org.za/index.php/sajr/article/view/486
https://sajr.org.za/index.php/sajr/article/view/486
Autor:
William Rae, H. du Raan, J.A. van Staden, Mattheus G. Lötter, Charles P. Herbst, A. van Aswegen
Publikováno v:
IFMBE Proceedings ISBN: 9783642038785
Scattered photons can be a problem in transmission computed tomography (TCT) when employing an uncollimated transmission source. As an uncollimated transmission source can generate many scatter events in the transmission data, accurate scatter correc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::95400cda3bc07f6ba87ab774e2387792
https://doi.org/10.1007/978-3-642-03879-2_218
https://doi.org/10.1007/978-3-642-03879-2_218
Publikováno v:
IFMBE Proceedings ISBN: 9783642038785
The aim of this research was to optimise the Computed Radiography (CR) system at Universitas Hospital by establishing baseline exposure levels for an Automatic Ex- posure Control (AEC) system and to investigate the relation- ship between the CR reade
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::241b683940c24cc9dd737807d223d0c8
https://doi.org/10.1007/978-3-642-03879-2_71
https://doi.org/10.1007/978-3-642-03879-2_71