R D Stewart
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Explore the profile of R D Stewart including associated specialties, affiliations and a list of published articles.
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Articles
245
Citations
1327
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Recent Articles
1.
Schuemann J, McNamara A, Warmenhoven J, Henthorn N, Kirkby K, Merchant M, et al.
Radiat Res
. 2018 Nov;
191(1):76-92.
PMID: 30407901
Our understanding of radiation-induced cellular damage has greatly improved over the past few decades. Despite this progress, there are still many obstacles to fully understand how radiation interacts with biologically...
2.
Kirkby C, Ghasroddashti E, Poirier Y, Tambasco M, Stewart R
Med Phys
. 2017 May;
39(7Part4):4645-4646.
PMID: 28516659
When performed daily, cone beam CT (CBCT) images can accumulate radiation dose to non-negligible levels. Because kV x-rays have a larger relative biological effectiveness (RBE) than its MV x-rays, the...
3.
Kirkby C, Ghasroddashti E, Poirier Y, Tambasco M, Stewart R
Phys Med Biol
. 2013 Aug;
58(16):5693-704.
PMID: 23899567
Due to the higher LET of kilovoltage (kV) radiation, there is potential for an increase in relative biological effectiveness (RBE) of absorbed doses of radiation from kV cone beam computed...
4.
Holdsworth C, Corwin D, Stewart R, Rockne R, Trister A, Swanson K, et al.
Phys Med Biol
. 2012 Nov;
57(24):8271-83.
PMID: 23190554
We demonstrate a patient-specific method of adaptive IMRT treatment for glioblastoma using a multiobjective evolutionary algorithm (MOEA). The MOEA generates spatially optimized dose distributions using an iterative dialogue between the...
5.
Schollnberger H, Stewart R, Mitchel R
Int J Low Radiat
. 2012 Feb;
3(2/3):135-142.
PMID: 22318364
In vitro studies show that protective tumour-reducing effects occur for low dose rates (mGy per minute). To account for these phenomena, we have previously developed stochastic and deterministic multi-stage cancer...
6.
Maciver R, Stewart R, Backer C, Tsao S, Harrington D, Mavroudis C
Braz J Med Biol Res
. 2010 Jan;
43(2):206-10.
PMID: 20084330
The atrioventricular (AV) node is permanently damaged in approximately 3% of congenital heart surgery operations, requiring implantation of a permanent pacemaker. Improvements in pacemaker design and in alternative treatment modalities...
7.
Schollnberger H, Stewart R, Mitchel R, Hofmann W
Nonlinearity Biol Toxicol Med
. 2009 Mar;
2(4):317-52.
PMID: 19330150
A multistage cancer model that describes the putative rate-limiting steps in carcinogenesis is developed and used to investigate the potential impact on cumulative lung cancer incidence of the hormesis mechanisms...
8.
Schollnberger H, Stewart R, Mitchel R
Dose Response
. 2008 Jul;
3(4):508-18.
PMID: 18648628
A stochastic two-stage cancer model with clonal expansion was used to investigate the potential impact on human lung cancer incidence of some aspects of the hormesis mechanisms suggested by Feinendegen...
9.
Stewart R, Fermin I, Opper M
IEEE Trans Neural Netw
. 2008 Feb;
13(6):1557-62.
PMID: 18244552
The seeded region growing (SRG) algorithm is a fast robust parameter-free method for segmenting intensity images given initial seed locations for each region. The requirement of predetermined seeds means that...
10.
Green H, Duhamel T, Stewart R, Tupling A, Ouyang J
Am J Physiol Endocrinol Metab
. 2008 Jan;
294(4):E761-7.
PMID: 18230697
The early plasticity of vastus lateralis Na(+)-K(+)-ATPase to the abrupt onset of prolonged submaximal cycling was studied in 12 untrained participants (Vo(2 peak) 44.8 +/- 2.0 ml x kg(-1) x...