scholarly journals Combining Ultrasound Pulse-Echo and Transmission Computed Tomography for Quantitative Imaging the Cortical Shell of Long-Bone Replicas

2017 ◽  
Vol 4 ◽  
Author(s):  
Matthew P. Shortell ◽  
Marwan A. M. Althomali ◽  
Marie-Luise Wille ◽  
Christian M. Langton
Keyword(s):  
Computed Tomography ◽  
Quantitative Imaging ◽  
Long Bone ◽  
Transmission Computed Tomography ◽  
Cortical Shell ◽  
Pulse Echo ◽  
Ultrasound Pulse

Transient Prealbumin- Associated Hyperthyroxinemia in TSH-Producing Pituitary Adenoma

1990 ◽  
Vol 29 (01) ◽  
pp. 40-43 ◽  
Author(s):  
W. Langsteger ◽  
P. Költringer ◽  
P. Wakonig ◽  
B. Eber ◽  
M. Mokry ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Case Report ◽  
Pituitary Adenoma ◽  
Thyroid Hormones ◽  
Protein Binding ◽  
Alpha Subunit ◽  
Normal Range ◽  
Thyroxine Binding Globulin ◽  
Free Thyroid Hormones ◽  
Transmission Computed Tomography

This case report describes a 38-year-old male who was hospitalized for further clarification of clinically mild hyperthyroidism. His increased total hormone levels, the elevated free thyroid hormones and the elevated basal TSH with blunted response to TRH strongly suggested a pituitary adenoma with inappropriate TSH incretion. Transmission computed tomography showed an intrasellar expansion, 16 mm in diameter. The neoplastic TSH production was confirmed by an elevated alpha-subunit and a raised molar alpha-sub/ATSH ratio. However, T4 distribution on prealbumin (PA, TTR), albumin (A) and thyroxine binding globulin (TBG) showed a clearly increased binding to PA (39%), indicating additional prealbumin-associated hyperthyroxinemia. The absolute values of PA, A and TBG were within the normal range. After removal of the TSH-producing adenoma, basal TSH, the free thyroid hormones and T4 binding to prealbumin returned to normal. Therefore, the prealbumin-associated hyperthyroxinemia had to be interpreted as a transitory phenomenon related to secondary hyperthyroidism (T4 shift from thyroxine binding globulin to prealbumin) rather than a genetically conditioned anomaly of protein binding.

Correlation between the direction of the interventricular septum estimated with transmission computed tomography and the initial QRS vectors

1984 ◽  
Vol 17 (4) ◽  
pp. 401-407 ◽  
Author(s):  
Naoki Kawai ◽  
Iwao Sotobata ◽  
Shoji Noda ◽  
Mitsuhiro Okada ◽  
Teruo Kondo ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Interventricular Septum ◽  
Transmission Computed Tomography

scholarly journals A study of the progression of damage in an axially loaded Branta leucopsis femur using X-ray computed tomography and digital image correlation

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3416 ◽  
Author(s):  
Zartasha Mustansar ◽  
Samuel A. McDonald ◽  
William Irvin Sellers ◽  
Phillip Lars Manning ◽  
Tristan Lowe ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Time Lapse ◽  
Image Correlation ◽  
Long Bone ◽  
Barnacle Goose ◽  
3D Images ◽  
X Ray ◽  
X Ray Computed

This paper uses X-ray computed tomography to track the mechanical response of a vertebrate (Barnacle goose) long bone subjected to an axial compressive load, which is increased gradually until failure. A loading rig was mounted in an X-ray computed tomography system so that a time-lapse sequence of three-dimensional (3D) images of the bone’s internal (cancellous or trabecular) structure could be recorded during loading. Five distinct types of deformation mechanism were observed in the cancellous part of the bone. These were (i) cracking, (ii) thinning (iii) tearing of cell walls and struts, (iv) notch formation, (v) necking and (vi) buckling. The results highlight that bone experiences brittle (notch formation and cracking), ductile (thinning, tearing and necking) and elastic (buckling) modes of deformation. Progressive deformation, leading to cracking was studied in detail using digital image correlation. The resulting strain maps were consistent with mechanisms occurring at a finer-length scale. This paper is the first to capture time-lapse 3D images of a whole long bone subject to loading until failure. The results serve as a unique reference for researchers interested in how bone responds to loading. For those using computer modelling, the study not only provides qualitative information for verification and validation of their simulations but also highlights that constitutive models for bone need to take into account a number of different deformation mechanisms.

scholarly journals Quantitative imaging of gold nanoparticle distribution in a tumor-bearing mouse using benchtop x-ray fluorescence computed tomography

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Nivedh Manohar ◽  
Francisco J. Reynoso ◽  
Parmeswaran Diagaradjane ◽  
Sunil Krishnan ◽  
Sang Hyun Cho
Keyword(s):  
Computed Tomography ◽  
Gold Nanoparticle ◽  
Quantitative Imaging ◽  
Tumor Bearing Mouse ◽  
X Ray ◽  
Nanoparticle Distribution ◽  
Tumor Bearing

scholarly journals Modelling the physics in the iterative reconstruction for transmission computed tomography

2013 ◽  
Vol 58 (12) ◽  
pp. R63-R96 ◽  
Author(s):  
Johan Nuyts ◽  
Bruno De Man ◽  
Jeffrey A Fessler ◽  
Wojciech Zbijewski ◽  
Freek J Beekman
Keyword(s):  
Computed Tomography ◽  
Iterative Reconstruction ◽  
Transmission Computed Tomography

Evaluation of a Combined Transmission and Scattering Approach to Composition Imaging of Industrial Samples

1991 ◽  
Vol 35 (B) ◽  
pp. 1235-1241
Author(s):  
T. H. Prettyraan ◽  
R. P. Gardner ◽  
J. C. Russ ◽  
K. Verghese
Keyword(s):  
Computed Tomography ◽  
Attenuation Coefficient ◽  
Dual Energy ◽  
Linear Attenuation Coefficient ◽  
Energy Transmission ◽  
Transmission Computed Tomography ◽  
Coefficient Distribution ◽  
Industrial Samples ◽  
The Given

Composition imaging of industrial samples has been reported using dual energy and multiple energy transmission computed tomography [1,2]. The simplest approach utilizes monoenergetic sources to obtain tomographs of a sample at two different energies. Each tomograph represents the linear attenuation coefficient distribution of the sample at the given source energy.

Abstract B15: Computed tomography for quantitative imaging of live cancer cells with isotropic 3D spatial resolution

2017 ◽  
Author(s):  
Laimonas Kelbauskas ◽  
Rishabh M. Shetty ◽  
Bin Cao ◽  
Kuo-Chen Wang ◽  
Dean Smith ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cancer Cells ◽  
Spatial Resolution ◽  
Quantitative Imaging
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