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2001

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Articles 1 - 30 of 44

Full-Text Articles in Biomedical Engineering and Bioengineering

Study Of The Trajectories Of Visually Guided Movement Of Unimanual And Bimanual Tasks, Deepthi Anand Dec 2001

Study Of The Trajectories Of Visually Guided Movement Of Unimanual And Bimanual Tasks, Deepthi Anand

Theses

Restitution of upper limb mobility following stroke is one of the major challenges facing clinicians in the country today. The complexity of performing skilled tasks with fine movements makes restitution of mobility all the more complex for rehabilitation specialists. Although several techniques have been evolved for, limited success with transfer of training from the clinical environment to functional performance clearly indicates a need for research and development in the area of upper extremity rehabilitation.

Bimanual coordination has recently surfaced as a novel and effective way to fast and lasting recovery. The success of bimanually coordinated training encourages a better understanding ...


Thermochemistry Of Vinyl Alcohol And Vinyl Ether Radical And Kinetic Analysis Of Neopentyl Radical Reaction With Molecular Oxygen, Chol-Han Kim Dec 2001

Thermochemistry Of Vinyl Alcohol And Vinyl Ether Radical And Kinetic Analysis Of Neopentyl Radical Reaction With Molecular Oxygen, Chol-Han Kim

Theses

Vinyl alcohols and ethers are important intermediates in low-temperature combustion processes, such as in the initial stages of combustion and in the atmospheric photochemical oxidation of hydrocarbons. Knowledge of the thermodynamic parameters for these species is central to understanding and predicting their reaction pathways, rate constants, and equilibrium constants. The rapid interconversion of conformers and the instability of vinyl alcohols and ethers lead to complexities in studies of these species.

In this work, enthalpy,ΔH°f 298, entropy, S°298, and heat capacities, Cp(T), are determined for vinyl alcohol and vinyl methyl ether and the radicals corresponding to loss ...


An Infrared Device To Measure The Eyeblink For The Study Of Classical Conditioning, Alka Patel Dec 2001

An Infrared Device To Measure The Eyeblink For The Study Of Classical Conditioning, Alka Patel

Theses

The classically conditioned eyeblink response is studied by various groups to study neurological functions. This is a form of associative leaming that has many features to help diagnose and learn about neurological diseases. Electromyogram traditionally is used to detect eyeblinks for this experimentation in human. However, EMG can be expensive and difficult to use. It involves the utilization of electrodes and produces only an indirect measure of eyelid closure. The goal of the project was to develop an infrared device to detect eyeblinks and replace the EMG. The project involved two major components, a hardware and a software component. The ...


A Real Time Frequency Analysis Of The Electroencephalogram Using Labview, Rupal Patel Dec 2001

A Real Time Frequency Analysis Of The Electroencephalogram Using Labview, Rupal Patel

Theses

The use of the Electroencephalogram (EEG) for diagnosis of brain related diseases is becoming a popular technique in the clinical and research environment. To achieve accurate reading of EEG, signal representation and classification becomes extremely important. The goal of this project was to develop a basic software program for acquiring and online processing of the electrical activity recorded from the brain. A program was developed using the LabVIEW programming software by National Instruments. Basic hardware components recorded the EEG signal and a software component divided the data into delta, theta, alpha and beta bands in the frequency domain. Emphasis was ...


Will Voluntary And Educational Programs Meet Environmental Objectives? Evidence From A Survey Of New York Dairy Farms, Gregory L. Poe, Nelson L. Bills, B. C. Bellows, Patricia Crosscombe, Richard K. Koelsch, Michael J. Kreher, Peter Wright Dec 2001

Will Voluntary And Educational Programs Meet Environmental Objectives? Evidence From A Survey Of New York Dairy Farms, Gregory L. Poe, Nelson L. Bills, B. C. Bellows, Patricia Crosscombe, Richard K. Koelsch, Michael J. Kreher, Peter Wright

Biological Systems Engineering: Papers and Publications

This paper presents the results from a survey of New York dairy farms that links manure management practices and farmer willingness to participate in voluntary environmental programs, focusing on those operations that are not automatically designated as Concentrated Animal Feeding Operations. A wide divergence is found between actual and recommended manure management practices on individual dairy farms (high), the apparent ability of farms to divert financial resources to environmental practices (mixed), and the willingness to participate in voluntary programs at various annual costs per cow (low). These findings have policy implications for the USDA/USEPA National Strategy for Animal Feeding ...


Computed Tomography To Assess Pulmonary Injury Associated With Concurrent Chemo-Radiotherapy For Inoperable Non-Small Cell Lung Cancer, Galit Aviram, Edward Yu, Patricia Tai, Michael Lefcoe Nov 2001

Computed Tomography To Assess Pulmonary Injury Associated With Concurrent Chemo-Radiotherapy For Inoperable Non-Small Cell Lung Cancer, Galit Aviram, Edward Yu, Patricia Tai, Michael Lefcoe

Edward Yu

OBJECTIVE: To characterize serial computed tomography (CT) findings of pulmonary injury after a uniform regimen of concurrent chemo-radiotherapy in inoperable non-small cell lung cancer, and to compare the radiation-induced lung toxicity with other concurrent chemo-radiation regimens. METHODS: Twenty-four patients with advanced non-small cell lung cancer received 2 induction cycles of cisplatin and vinblastine, followed by 2 further cycles of cisplatin and vinblastine, concurrent with 60 Gy radiation at 2 Gy per fraction. Radiation-induced lung injury in the acute and chronic phases was assessed by serial CT scans and compared with preradiation baseline scans. Acute radiation pneumonitis was evaluated using the ...


Total Elbow Arthroplasty System, Michael G. Conzemius Oct 2001

Total Elbow Arthroplasty System, Michael G. Conzemius

Iowa State University Patents

A total elbow arthroplasty system, incorporating a humeral component, a radial component and a ball component, may be used as a total elbow replacement in the canine, as well as in other species. The implant of the present invention has an isometric humeral component and an isometric radial component. An isometric ball component having an isometric articular surface is mounted on the radial component. The humeral and radial components have stems for mounting in the medullary canals of the respective bones, which are angled so as to approximate the configuration of the original humerus and radius. The components work together ...


Bme Stats Fall 2001, Department Of Biomedical Engineering, Florida International University Oct 2001

Bme Stats Fall 2001, Department Of Biomedical Engineering, Florida International University

STATS

No abstract provided.


Automated Myocardial Infarction Diagnosis From Ecg, Chen Zhou Oct 2001

Automated Myocardial Infarction Diagnosis From Ecg, Chen Zhou

Doctoral Dissertations

In the present dissertation, an automated neural network-based ECG diagnosing system was designed to detect the presence of myocardial infarction based on the hypothesis that an artificial neural network-based ECG interpretation system may improve the clinical myocardial infarction. 137 patients were included. Among them 122 had myocardial infarction, but the remaining 15 were normal. The sensitivity and the specificity of present system were 92.2% and 50.7% respectively. The sensitivity was consistent with relevant research. The relatively low specificity results from the rippling of the low pass filtering. We can conclude that neural network-based system is a promising aid ...


Modeling Of Deoxy- And Dideoxyaldohexopyranosyl Ring Puckering With Mm3(92), William M. Rockey, Michael K. Dowd, Peter J. Reilly, Alfred D. French Oct 2001

Modeling Of Deoxy- And Dideoxyaldohexopyranosyl Ring Puckering With Mm3(92), William M. Rockey, Michael K. Dowd, Peter J. Reilly, Alfred D. French

Chemical and Biological Engineering Publications

Extensive variations of the ring structures of three deoxyaldohexopyranoses, l-fucose, d-quinovose, and l-rhamnose, and four dideoxyaldohexopyranoses, d-digitoxose, abequose, paratose, and tyvelose, were studied by energy minimization with the molecular mechanics algorithm MM3(92). Chair conformers, 4C1 ind-quinovose and the equivalent 1C4 in l-fucose and l-rhamnose, overwhelmingly dominate in the three deoxyhexoses; in the d-dideoxyhexoses, 4C1 is again dominant, but with increased amounts of 1C4 forms in the α anomers of the three 3,6-dideoxyhexoses, abequose, paratose, and tyvelose and in both α and β anomers of the 2,6-dideoxyhexose d-digitoxose. In general ...


Nutrients In Runoff Following The Application Of Swine Manure To Interrill Areas, John E. Gilley, Bahman Eghball, B. J. Weinhold, Phillip S. Miller Sep 2001

Nutrients In Runoff Following The Application Of Swine Manure To Interrill Areas, John E. Gilley, Bahman Eghball, B. J. Weinhold, Phillip S. Miller

Biological Systems Engineering: Papers and Publications

The P content of swine manure can be reduced through the addition of feed supplements or the use of selected corn hybrids. This study was conducted to compare interrill runoff losses of P and N from three soils following the application of swine manure obtained from selected diets. The soils used in this investigation included a Hersh sandy loam, Pierre silty clay, and Sharpsburg silt loam. Simulated rainfall was applied during both initial and wet runs to a soil pan on which swine manure produced from low phytate corn (LPC), phytase added to the diet (PHY), or a traditional corn ...


Encoding And Storage Components Of Verbal Working Memory As Revealed By A Factorial Design, An Fmri Study, Jason Steffener Aug 2001

Encoding And Storage Components Of Verbal Working Memory As Revealed By A Factorial Design, An Fmri Study, Jason Steffener

Theses

In this fMRI study, the contributions of frontal and posterior brain regions to verbal working memory were investigated. A two-factor design with low and high memory load (2 and 5 letters) and short and long delay (4 and 12 secs.) as factors were used. Based on reports in the literature, we expect activity in the following frontal and parietal brain regions of interest (ROIs): Brodmann areas (BA) 6, 9, 46, 44, 45, 7 and 40. The analysis of collected flvM data involved image processing and statistical analysis methods including realignment, spatial normalization, spatial smoothing, temporal filtering, intensity normalization, statistical tests ...


Role Of Nitric Oxide As A Modulator Of Platelet Dense Granule Release, Clifton Ford Frilot Ii Jul 2001

Role Of Nitric Oxide As A Modulator Of Platelet Dense Granule Release, Clifton Ford Frilot Ii

Doctoral Dissertations

Nitric oxide (NO) has been shown to suppress platelet activation, induce vasodilation, inhibit smooth muscle cell proliferation, and act against infection. Activated platelets generally have opposite effects from these. They secrete platelet-derived growth factor (PDGF), which stimulates smooth muscle growth, serotonin, which is a platelet agonist, and a number of agents that promote further platelet aggregation. However, activated platelets also produce NO through the enzymatic functions of the constitutive form of nitric oxide synthase (NOS). The primary functions of this capability are not yet completely understood. Due to its low molecular weight and high diffusivity, NO is quickly transported from ...


Polysaccharide Recognition By Surfactant Protein D:  Novel Interactions Of A C-Type Lectin With Nonterminal Glucosyl Residues, Martin J. Allen, Alain Laederach, Peter J. Reilly, Robert J. Mason Jul 2001

Polysaccharide Recognition By Surfactant Protein D:  Novel Interactions Of A C-Type Lectin With Nonterminal Glucosyl Residues, Martin J. Allen, Alain Laederach, Peter J. Reilly, Robert J. Mason

Chemical and Biological Engineering Publications

Surfactant protein D (SP-D), a C-type lectin, is an important pulmonary host defense molecule. Carbohydrate binding is critical to its host defense properties, but the precise polysaccharide structures recognized by the protein are unknown. SP-D binding toAspergillus fumigatus is strongly inhibited by a soluble β-(1→6)-linked but not by a soluble β-(1→3)-linked glucosyl homopolysaccharide (pustulan and laminarin, respectively), suggesting that SP-D recognizes only certain polysaccharide configurations, likely through differential binding to nonterminal glucosyl residues. In this study we have computationally docked α/β-d-glucopyranose and α/β-(1→2)-, α/β-(1→3)-, α/β- ...


Partial Characterization Of Extruded Collagen Tubes With Varied Material Deposition And Orientation Based On Rotation Rate And Linear Draw Speed, Richard Peter Hoppe May 2001

Partial Characterization Of Extruded Collagen Tubes With Varied Material Deposition And Orientation Based On Rotation Rate And Linear Draw Speed, Richard Peter Hoppe

Theses

This study established protocols for extrusion of collagen tubes from an extruder made by the ZOKO Corporation of Czechoslovakia. Using a viscous collagen base material, collagen tubes can be formed with changes in rotation rates from 0 rpm to 260 rpm and linear draw speeds from 383 mm/min to 1270 mm/min with a constant extrusion rate of 50 cm2/min. These tubes, with further research and treatment, can be used for various medical applications including vascular implants and nerve conduits.

Post-extrusion, chemical crosslinking of the collagen increased the cohesiveness and mechanical integrity of the tubes. Microscopic photographs ...


Alterations In P53 And E2f-1 Function Common To Immortalized Chicken Embryo Fibroblasts, Sakthikumar Ambady, Hyunggee Kim, Seungkwon You, In-Jeong Kim, Linda Foster, James Farris, F Able Ponce Leon, Douglas Foster May 2001

Alterations In P53 And E2f-1 Function Common To Immortalized Chicken Embryo Fibroblasts, Sakthikumar Ambady, Hyunggee Kim, Seungkwon You, In-Jeong Kim, Linda Foster, James Farris, F Able Ponce Leon, Douglas Foster

Sakthikumar Ambady

A number of non-virally and non-chemically immortalized chicken embryo fibroblast (CEF) cells have been established recently in continuous cell culture. All immortal CEF cells tested showed common genetic alterations in the expression patterns of p53 and E2F-1 mRNA and protein which were down- and up-regulated, respectively. The biological effects of differentially regulated p53 and E2F-1 were determined by reporter gene transcriptional activity assays, DNA binding assays, and Northern blot analysis of the expression patterns of down-stream genes. In addition, expression of most of the cyclin genes was up-regulated in immortal CEF cells, which may be associated with the rapid cell ...


Generation Of Oxygen Microbubbles In A Microchannel With Crosscurrent Liquid Flow, Sung Sam Kim Apr 2001

Generation Of Oxygen Microbubbles In A Microchannel With Crosscurrent Liquid Flow, Sung Sam Kim

Doctoral Dissertations

An alternative way of blood oxygenation is proposed by introducing small bubbles directly into the blood stream. To be used for blood oxygenation, the bubble should be small enough to pass through the capillary beds. To explore the feasibility of producing small bubbles, bubble formation phenomena in a crosscurrent liquid flow in a silicon microchannel were studied. Small orifices with 4 μm, 4.2 μm, and 6.6 μm hydraulic diameter were machined in a direction perpendicular to a trapezoidal channel that has a hydraulic diameter of 42 micrometers. These orifices were connected to three different chambers of 2.5 ...


Evaluation Of 135- And 150-Degree Sliding Hip Screws, Kelly Blayne Crittenden Apr 2001

Evaluation Of 135- And 150-Degree Sliding Hip Screws, Kelly Blayne Crittenden

Doctoral Dissertations

Sliding hip screws are routinely used to repair Garden III femoral neck factures. This research seeks to better understand the influence of the hip screw angle on the performance of the fixation. The mechanics of fractured femurs repaired with 135- and 150-degree sliding fixation devices are explored using experimental, finite element, and analytical modeling. The experimental study involves testing of both intact and fixated femurs; the finite element work centers on two-dimensional models of intact and fixated femurs; and the analytical modeling explores the forces, moments and stresses in the fixation. The analytical model predicts that the screw will serve ...


In Vivo Flow Dynamics Of The Total Cavopulmonary Connection From Three-Dimensional Multislice Magnetic Resonance Imaging, Shiva Sharma, Ann E. Ensley, Katherine Hopkins, George P. Chatzimavroudis, Timothy M. Healy, Vincent K.H. Tam, Kirk R. Kanter, Ajit P. Yoganathan Mar 2001

In Vivo Flow Dynamics Of The Total Cavopulmonary Connection From Three-Dimensional Multislice Magnetic Resonance Imaging, Shiva Sharma, Ann E. Ensley, Katherine Hopkins, George P. Chatzimavroudis, Timothy M. Healy, Vincent K.H. Tam, Kirk R. Kanter, Ajit P. Yoganathan

Chemical & Biomedical Engineering Faculty Publications

Background. The total cavopulmonary connection (TCPC) design continues to be refined on the basis of flow analysis at the connection site. These refinements are of importance for myocardial energy conservation in the univentricular supported circulation. In vivo magnetic resonance phase contrast imaging provides semiquantitative flow visualization information. The purpose of this study was to understand the in vivo TCPC flow characteristics obtained by magnetic resonance phase contrast imaging and compare the results with our previous in vitro TCPC flow experiments in an effort to further refine TCPC surgical design.

Methods. Twelve patients with TCPC underwent sedated three-dimensional, multislice magnetic resonance ...


A Mechanistic Model For Internal Bone Remodeling Exhibits Different Dynamic Responses In Disuse And Overload, Scott J. Hazelwood, R. Bruce Martin, Mark M. Rashid, Juan J. Rodrigo Mar 2001

A Mechanistic Model For Internal Bone Remodeling Exhibits Different Dynamic Responses In Disuse And Overload, Scott J. Hazelwood, R. Bruce Martin, Mark M. Rashid, Juan J. Rodrigo

Biomedical and General Engineering

Bone is a dynamic tissue which, through the process of bone remodeling in the mature skeleton, renews itself during normal function and adapts to mechanical loads. It is, therefore, important to understand the effect of remodeling on the mechanical function of bone, as well as the effect of the inherent time lag in the remodeling process. In this study, we develop a constitutive model for bone remodeling which includes a number of relevant mechanical and biological processes and use this model to address differences in the remodeling behavior as a volume element of bone is placed in disuse or overload ...


Circumferential Creep Of Human Cortical Bone Suggests Threshold For Press - Fit Stems, C. U. Brown, V. L. Kish, Timothy L. Norman, T. A. Gruen, J. D. Blaha Feb 2001

Circumferential Creep Of Human Cortical Bone Suggests Threshold For Press - Fit Stems, C. U. Brown, V. L. Kish, Timothy L. Norman, T. A. Gruen, J. D. Blaha

Engineering and Computer Science Faculty Presentations

No abstract provided.


Damage Evolution And Fracture Behavior Of Human Compact Bone Specimens In 3 - Point Bending, G. P. Parsamian, V. L. Kish, Timothy L. Norman Feb 2001

Damage Evolution And Fracture Behavior Of Human Compact Bone Specimens In 3 - Point Bending, G. P. Parsamian, V. L. Kish, Timothy L. Norman

Engineering and Computer Science Faculty Presentations

No abstract provided.


In - Vivo Diffuse Damage In Human Cortical Bone Does Not Compromise Bone Toughness, Timothy L. Norman, G. P. Parsamian, C. Coleman Feb 2001

In - Vivo Diffuse Damage In Human Cortical Bone Does Not Compromise Bone Toughness, Timothy L. Norman, G. P. Parsamian, C. Coleman

Engineering and Computer Science Faculty Presentations

No abstract provided.


Michaelis–Menten Kinetics For Enzymatic Depolymerization Of A Linear Polyester Synthesized From Z-Protected Glutamic Acid, R M. Tadros, Hossein Noureddini, Delmar C. Timm Feb 2001

Michaelis–Menten Kinetics For Enzymatic Depolymerization Of A Linear Polyester Synthesized From Z-Protected Glutamic Acid, R M. Tadros, Hossein Noureddini, Delmar C. Timm

Papers in Biomaterials

A biodegradable polyester resin was polymerized from N-benzyloxycarbonyl- L -glutamic acid and ethylene glycol. Rhizopus delemar lipase was used as a biocatalyst for the rupture of ester bonds during the hydrolysis studies. Depoly-merization was observed to followa Michaelis–Menten mechanism, with the maximumrate of monomer formation dP/dtmax = 1.12 x 10-8 mol/s and the rate constant Km x 2.03 x 10-4 mol. Subject to initial conditions described by the most probable distribution and Michaelis–Menten–type depolymerization rate expressions, population density distribu-tion dynamics of the polymeric molecules that formed the resin were explicitly described using a deterministic ...


Semiautomated Skeletonization Of The Pulmonary Arterial Tree In Micro-Ct Images, Christopher C. Hanger, Steven Thomas Haworth, Robert C. Molthen, Christopher A. Dawson Feb 2001

Semiautomated Skeletonization Of The Pulmonary Arterial Tree In Micro-Ct Images, Christopher C. Hanger, Steven Thomas Haworth, Robert C. Molthen, Christopher A. Dawson

Biomedical Engineering Faculty Research and Publications

We present a simple and robust approach that utilizes planar images at different angular rotations combined with unfiltered back-projection to locate the central axes of the pulmonary arterial tree. Three-dimensional points are selected interactively by the user. The computer calculates a sub- volume unfiltered back-projection orthogonal to the vector connecting the two points and centered on the first point. Because more x-rays are absorbed at the thickest portion of the vessel, in the unfiltered back-projection, the darkest pixel is assumed to be the center of the vessel. The computer replaces this point with the newly computer-calculated point. A second back-projection ...


Pulmonary Arterial Remodeling Revealed By Microfocal X-Ray Tomography, Kelly L. Karau, Robert C. Molthen, Anita H. Dhyani, Steven Thomas Haworth, Christopher A. Dawson Feb 2001

Pulmonary Arterial Remodeling Revealed By Microfocal X-Ray Tomography, Kelly L. Karau, Robert C. Molthen, Anita H. Dhyani, Steven Thomas Haworth, Christopher A. Dawson

Biomedical Engineering Faculty Research and Publications

Animal models and micro-CT imaging are useful for understanding the functional consequences of, and identifying the genes involved in, the remodeling of vascular structures that accompanies pulmonary vascular disease. Using a micro-CT scanner to image contrast-enhanced arteries in excised lungs from fawn hooded rats (a strain genetically susceptible to hypoxia induced pulmonary hypertension), we found that portions of the pulmonary arterial tree downstream from a given diameter were morphometrically indistinguishable. This 'self-consistency' property provided a means for summarizing the pulmonary arterial tree architecture and mechanical properties using a parameter vector obtained from measurements of the contiguous set of vessel segments ...


System And Process For Producing Biodiesel Fuel With Reduced Viscosity And A Cloud Point Below Thirty-Two (32) Degrees Fahrenheit , Hossein Noureddini Jan 2001

System And Process For Producing Biodiesel Fuel With Reduced Viscosity And A Cloud Point Below Thirty-Two (32) Degrees Fahrenheit , Hossein Noureddini

Papers in Biomaterials

Triglycerides are reacted in a liquid phase reaction with a homogeneous basic catalyst and alcohol, such as ethanol or methanol. The reaction yields a spatially separated two phase result with an upper located non-polar phase consisting principally of transesterified triglycerides and a lower located phase consisting principally of crude glycerol and residual transesterified triglycerides. The transesterified triglycerides and/or glycerol phase is/are optionally, each separately passed through strong cationic ion exchanger(s) to remove anions, resulting in neutral product(s). The crude glycerol is then flashed to remove alcohol and is reacted with an etherifying agent, such as isobutylene ...


Manure Impacts On Interrill Erosion, John E. Gilley, Bahman Eghball, J. M. Blumenthal, David D. Baltensperger Jan 2001

Manure Impacts On Interrill Erosion, John E. Gilley, Bahman Eghball, J. M. Blumenthal, David D. Baltensperger

Conference Presentations and White Papers: Biological Systems Engineering

This study was conducted to measure runoff and erosion from interrill areas as affected by the long-term application of manure and fertilizer to a Tripp sandy loam soil located near Mitchell, Nebraska. Soil that had been removed from the top 0.1 m of the soil profile was placed in a 1 m2 soil pan. Rainfall was then applied to the soil pan during initial and wet simulation events. Total runoff was similar on the manure and no-manure treatments. The long-term application of manure (55 years) at a rate of 27 Mg ha-1 (wet basis) per year did ...


Focal Osteolysis At The Junctions Of A Modular Stainless-Steel Femoral Intramedullary Nail, Darron M. Jones, Lawrence Marsh, James V. Nepola, Joshua J. Jacobs, Anastasia K. Skipor, Robert M. Urban, Jeremy L. Gilbert, Josheph A. Buckwater Jan 2001

Focal Osteolysis At The Junctions Of A Modular Stainless-Steel Femoral Intramedullary Nail, Darron M. Jones, Lawrence Marsh, James V. Nepola, Joshua J. Jacobs, Anastasia K. Skipor, Robert M. Urban, Jeremy L. Gilbert, Josheph A. Buckwater

Biomedical and Chemical Engineering

Background:

During routine follow-up of patients treated with a three-piece stainless-steel modular femoral nail, osteolysis and periosteal reaction around the modular junctions of some of the nails were noted on radiographs. The purpose of this study was to evaluate the prevalence, etiology, and clinical relevance of these radiographic findings.

Methods:

Forty-four femoral fractures or nonunions in forty-two patients were treated with a modular stainless-steel femoral intramedullary nail. Seventeen nails were excluded, leaving twenty-seven intramedullary nails in twenty-seven patients for this study. All patients had had a femoral diaphyseal fracture; nineteen had had an acute fracture and eight, a nonunion. These ...


Evaluation Of The Precision Of Magnetic Resonance Phase Velocity Mapping For Blood Flow Measurements, George P. Chatzimavroudis, John N. Oshinski, Robert H. Franch, Peter G. Walker, Ajit P. Yoganathan, Roderic I. Pettigrew Jan 2001

Evaluation Of The Precision Of Magnetic Resonance Phase Velocity Mapping For Blood Flow Measurements, George P. Chatzimavroudis, John N. Oshinski, Robert H. Franch, Peter G. Walker, Ajit P. Yoganathan, Roderic I. Pettigrew

Chemical & Biomedical Engineering Faculty Publications

Evaluating the in vivo accuracy of magnetic resonance phase velocity mapping (PVM) is not straightforward because of the absence of a validated clinical flow quantification technique. The aim of this study was to evaluate PVM by investigating its precision, both in vitro and in vivo, in a 1.5 Tesla scanner. In the former case, steady and pulsatile flow experiments were conducted using an aortic model under a variety of flow conditions (steady: 0.1–5.5 L/min; pulsatile: 10–75 mL/cycle). In the latter case, PVM measurements were taken in the ascending aorta of ten subjects, seven ...