Steven I. Pollmann

A novel method to simulate radiographs of 3D printed objects

Maxwell C. Campbell, Steven I. Pollmann, Jaques S. Milner, Emily Lalone et autres

BACKGROUND: 3D printing has a number of applications within medicine and healthcare. In applications involving radiography, the internal infill structure and external geometry of a 3D printed part can produce undesirable artifacts, limiting the full potential of 3D printing as a manufacturing …

ca (code pays fourni par la source)

Performance evaluation of a miniature 14-channel spectrometer for low-cost qPCR

Tamie L. Poepping, Steven I. Pollmann, Lee D. Sikstrom, David W. Holdsworth

Analytic instrumentation for biomedical research is typically too expensive for low-resource settings, which limits research capacity around the world. However, recent developments in ultra-miniature optical instrumentation provide the opportunity to re-think some types of lab equipment, such as quantitative PCR (qPCR) systems. …

INSTRUMENTING KNEE BRACES WITH A LOW-COST AND LOW-POWER WEARABLE SENSOR TO MONITOR ADHERENCE: A PROOF-OF-CONCEPT STUDY

Harvi F. Hart, Steven I. Pollmann, Trevor B. Birmingham, David W. Holdsworth

ca (code pays fourni par la source)

Cost-effective micro-CT system for non-destructive testing of titanium 3D printed medical components

Santiago F. Cobos, Chris J. D. Norley, Steven I. Pollmann, David W. Holdsworth

Micro-CT imaging can be used as an effective method for non-destructive testing (NDT) of metal 3D printed parts-including titanium biomedical components fabricated using laser powder-bed-fusion (LPBF). Unfortunately, the cost of commercially available micro-CT scanners renders routine NDT for biomedical applications prohibitively expensive. …

ca (code pays fourni par la source)

High-dynamic-range micro-CT for nondestructive testing of titanium 3D-printed medical components

Santiago F. Cobos, Chris J. D. Norley, Steven I. Pollmann, David W. Holdsworth

Purpose: Industrial microcomputed tomography (micro-CT) scanners are suitable for nondestructive testing (NDT) of metal, 3D-printed medical components. Typically, these scanners are equipped with high-energy sources that require heavy shielding and costly infrastructure to operate safely, making routine NDT of medical components prohibitively …

ca (code pays fourni par la source)

Reduction of ring artifacts caused by 2D anti-scatter grids in flat-panel CBCT

Santiago F. Cobos, Hristo N. Nikolov, Steven I. Pollmann, David W. Holdsworth

Two-dimensional anti-scatter grids (2D-ASGs) have been developed to selectively capture scattered photons while preserving image signal in flat-panel cone-beam CT systems (CBCT). However, 2D-ASGs affect the response of detector elements underneath grid-septa, producing grid-line artifacts (GLA), which render traditional gain-and-offset corrections ineffective. …

ca (code pays fourni par la source)

Micro-CT imaging technique to characterize diffusion of small-molecules

Tina Khazaee, Chris J. D. Norley, Hristo N. Nikolov, Steven I. Pollmann et autres

Optimization and characterization of small-molecule diffusion are important in the development of drug-delivery systems. For example, the delivery of local antibiotics is an important component of therapy for orthopedic devicerelated infections (ODRI). However, despite its wide use, the exact elution mechanism is …

ca (code pays fourni par la source)

Microcomputed Tomography Is a Precise Method That Allows for Topographical Characterization of Lymph Nodes and Lymphatic Vessels

Dale E. Fournier, Adam M.R. Groh, Shiva M. Nair, Chris J. D. Norley et autres

Background: Surgical excision and/or radiation targeting of regional lymph nodes are an essential component in the clinical management of cancer. Importantly, a more accurate understanding of lymphatic anatomy could enable refinement of present treatment strategies. Given the spatial resolution limitations of contemporary …

ca (code pays fourni par la source)

Extending the dynamic range of biomedical micro-computed tomography for application to geomaterials

Dave Edey, Steven I. Pollmann, Daniel Lorusso, Maria Drangova et autres

BACKGROUND: X-ray computed tomography (CT) can non-destructively examine objects by producing three-dimensional images of their internal structure. Although the availability of biomedical micro-CT offers the increased access to scanners, CT images of dense objects are susceptible to artifacts particularly due to beam …

ca (code pays fourni par la source)

Ectopic spinal calcification associated with diffuse idiopathic skeletal hyperostosis (DISH): A quantitative micro‐ct analysis

Dale E. Fournier, Chris J. D. Norley, Steven I. Pollmann, Christopher S. Bailey et autres

Diffuse idiopathic skeletal hyperostosis (DISH) is a non-inflammatory spondyloarthropathy identified radiographically by calcification of the ligaments and/or entheses along the anterolateral aspect of the vertebral column. The etiology and pathogenesis of calcifications are unknown, and the diagnosis of DISH is currently based …

ca (code pays fourni par la source)

In-vitro comparison of different palatal sites for orthodontic miniscrew insertion: Effect of bone quality and quantity on primary stability

Carine Bourassa, Yara K. Hosein, Steven I. Pollmann, Khadry Galil et autres

ca (code pays fourni par la source)

Micro‐computed tomography: Applications for high‐resolution skeletal density determinations: An example using annually banded crustose coralline algae

P. Chan, Jochen Halfar, Chris J. D. Norley, Steven I. Pollmann et autres

Abstract Warming and acidification of the world's oceans are expected to have widespread consequences for marine biodiversity and ecosystem functioning. However, due to the relatively short record of instrumental observations, one has to rely upon geochemical and physical proxy information stored in …

ca, us (code pays fourni par la source)