D W Townsend
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Explore the profile of D W Townsend including associated specialties, affiliations and a list of published articles.
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62
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1643
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Recent Articles
41.
Townsend D, Geissbuhler A, Defrise M, Hoffman E, Spinks T, Bailey D, et al.
IEEE Trans Med Imaging
. 1991 Jan;
10(4):505-12.
PMID: 18222855
A fully 3-D reconstruction algorithm has been developed to reconstruct data from a 16 ring PET camera (a Siemens/CTI 953B) with automatically retractable septa. The tomograph is able to acquire...
42.
Bailey D, Jones T, Spinks T, Gilardi M, Townsend D
IEEE Trans Med Imaging
. 1991 Jan;
10(3):256-60.
PMID: 18222825
The noise-equivalent count-rate (NEC) performance of a neuro-positron emission tomography (PET) scanner has been determined with and without interplane septa on uniform cylindrical phantoms of differing radii and in human...
43.
Townsend D, Defrise M, Geissbuhler A, Spinks T, Jones T
Prog Clin Biol Res
. 1991 Jan;
363:139-54.
PMID: 1988969
No abstract available.
44.
Townsend D, Defrise M, Geissbuhler A, Spinks T, Bailey D, Gilardi M, et al.
Med Prog Technol
. 1991 Jan;
17(3-4):223-8.
PMID: 1839854
Emission scan data acquired by a multi-ring PET camera operated with septa retracted must be corrected for (1) geometrical and detector sensitivity variations between the different lines of response (normalisation),...
45.
Townsend D
Ciba Found Symp
. 1991 Jan;
163:57-69; discussion 69-75.
PMID: 1815896
The absolute sensitivity of a state-of-the-art, commercial neuroPET tomograph with interplane septa is about 0.5%. This poor utilization of the available photons could be improved by increasing the intrinsic efficiency...
46.
Vilensky J, Gankiewicz E, Townsend D
Am J Phys Anthropol
. 1990 Mar;
81(3):429-39.
PMID: 2327483
Changes in the values of certain locomotor parameters were analyzed over a range of speeds for five immature vervet monkeys sampled at 6 month intervals over approximately a 3 year...
47.
Vilensky J, Wilson P, Gankiewicz E, Townsend D
J Mot Behav
. 1989 Dec;
21(4):429-56.
PMID: 15136255
Limb movements during air-stepping were analyzed in three neonatal vervet monkeys over a three-week period. The movements had similar temporal organization both across animals and across time. For example, the...
48.
Defrise M, Townsend D, Clack R
Phys Med Biol
. 1989 May;
34(5):573-87.
PMID: 2787913
Three-dimensional medical image reconstruction for both transmission and emission tomography has traditionally decomposed the problem into a set of two-dimensional reconstructions on parallel transverse sections. There is, however, increasing interest...
49.
Coburn S, Townsend D
In Vivo
. 1989 May;
3(3):215-23.
PMID: 2519856
Several improvements have been incorporated into a previously described compartmental model of vitamin B6 metabolism in order to expand the application of the model to non-steady state conditions such as...
50.
Coburn S, Mahuren J, WOSTMANN B, Snyder D, Townsend D
J Nutr
. 1989 Feb;
119(2):181-8.
PMID: 2918389
In previous work identification of urinary metabolites of 4'-deoxypyridoxine which had been oxidized in the 5'-position and long-term dilution of labeled urinary metabolites with unlabeled molecules suggested possible microbial contributions....