Equipment and Supplies Commons^™

Magnification In Images Produced By Five Popular Digital Lateral Cephalometric Machines, Gretchen Marie Schnepper

Loma Linda University Electronic Theses, Dissertations & Projects

Modern digital lateral cephalometric images are produced by machines that vary in a number of critical features such as: 1) machine geometry, 2) movement (or lack of movement) of the x-ray source, 3) movement (or lack of movement) or x-ray detectors, 4) cephalostat geometry and 5) digital data manipulations by proprietary software. The purpose of this study was to evaluate the magnification characteristics of images produced by five commercial digital lateral cephalometric machines. These digital image magnification characteristics were then compared with images produced by an analog cephalometric machine. The two goals of this study were to: 1) measure the …

The Impact Of Systematically Varying The Duration Of Breath Samples During Infrared-Based Alcohol Breath Testing, Chris C. Clatterbuck

Dissertations

The present study set out to investigate the reliability and performance of the BAC DataMaster®, an infrared-based alcohol breath testing instrument. The focus of this study was to determine: (a) the impact of varying breath sample duration during testing, (b) if Blood Alcohol Concentration (BAC) levels produced by the DataMaster® (BAC_DM) are significantly different from BAC levels produced by analysis of whole blood (BAC_WB), and (c) if the relationship between BAC_DM estimates and BAC_WB is influenced by the amount of alcohol an examinee has ingested. Each of 27 participants was randomly assigned to one …

Effects Of Welding Electropolished Stainless Steel As Used In Ultra-Pure Fluid Delivery Systems For The Semiconductor And Pharmaceutical Industries, Steve Trigwell, Guna Selvaduray

Journal of the Arkansas Academy of Science

In the semiconductor and pharmaceutical industries, care is taken to prevent any contribution to product contamination or corrosion from the fluid delivery systems. Electropolished 316L stainless steel has become the industry standard due to its superior corrosion resistance. However, welding of the tubing often leads to discoloration in the heat affected zone (HAZ) which can lead to corrosion. Electropolished specimens from various lots of 316L stainless steel tubing were welded under identical parameters, but with varying concentrations of oxygen leaked into the argon purge gas during the welding, simulating on-site welding conditions. Various levels of discoloration were observed in the …

The Correlation Between The Levels Of Education Of Clinical Laboratory Personnel And The Accuracy Of Peripheral Blood Smear Results, Susan J. Leclair

Walden Dissertations and Doctoral Studies

This study correlated the performance accuracy of peripheral blood differentials evaluated by clinical laboratory scientists and clinical laboratory technicians. Fifty-one senior-year students from four clinical laboratory science baccalaureate programs and 37 second-year students from five clinical laboratory technician programs were given 10 peripheral blood differentials to perform. Results were compared to the values assigned by the Rajamaki method of proficiency testing. There was a significant discrepancy in the levels of accuracy between the two cohorts, suggesting that the results of peripheral blood differentials performed by clinical laboratory technicians is suspect. Facilities wishing to maintain or improve the quality of laboratory …

Qualitative Evaluation Of Data Compression In Real-Time Ultrasound Imaging, Bijoy J. Sundersingh

Theses and Dissertations (ETD)

The purpose of this project was to evaluate qualitatively real-time ultrasound imaging using objective and subjective techniques to determine the minimum bandwidth required for clinical diagnosis of various anatomical and pathological states. In the experimental setup live ultrasound video samples representing the most common clinical examinations were compressed at 128, 256, 384, 768, 1152 and 1536 kbps using a compressor-decompressor (CODEC) adhering to International Telecommunication Union (ITU-T) recommendation H.261. A protocol for qualitative evaluation was developed and subjective and objective testing were performed based on this protocol. Subjective methods comprised of inter-rater reliability tests using kappa statistics and three way …

Providing Low-Cost Assistive Equipment Through Home Care Services: The Massachusetts Assistive Equipment Demonstration, Alison S. Gottlieb, Francis G. Caro

Gerontology Institute Publications

This report describes the Massachusetts Assistive Equipment Demonstration, a collaborative project funded by the Robert Wood Johnson’s Home Care Research Initiative and carried out collaboratively by the Gerontology Institute at the University of Massachusetts Boston and the Executive Office of Elder Affairs (EOEA). The purpose of the demonstration was to systematically encourage the use of low-cost assistive equipment among elderly clients through existing case management resources, thereby extending the effectiveness of the Massachusetts home care program by supplementing formal services with expanded use of assistive equipment.

Portal Imaging Using A Csi (Tl) Scintillator Coupled To A Cooled Ccd Camera, Amit Sawant

Theses and Dissertations (ETD)

The purpose of this research was to design a high performance digital portal imaging
system, using a transparent x-ray scintillator coupled to a cooled CCD camera. Theoretical
analysis using Monte Carlo simulation was performed to calculate the QDE, SNR and DQE of
the system. A prototype electronic portal imaging device (EPID) was built, using a 12.7 mm
thick, 20.32 cm diameter, CsI (Tl) scintillator, coupled to an Astromed ® liquid nitrogen cooled
CCD TV camera. The system geometry of the prototype EPID was optimized to achieve high
spatial resolution. Experimental evaluation of the prototype EPID was performed, by
determining its …

Vr Projects, P.D. Quick

SWITCH

A description of three three projects having to do with virtual reality. The first is the Nanomanipulator, developed at the University of North Carolina Chapel Hill Department of Computer Science in conjunction with the UCLA Department of Chemistry in 1991. It is a machine that allows the user to interact with microscopic particles previously only visible in 2D from an electron microscope. The second project, The Augmented Reality Project, also developed at the Chapel Hill Department of Computer Science. This device used ultrasound images to be placed over a body allowing the user to see inside of it. The final …

Complexity Of Fetal Movement Detection Using A Single Doppler Ultrasound Transducer, William A. Russell Jr., Curtis L. Lowery, Patrick J. Baggot, James D. Wilson, Robert Walls, Roger M. Hawk, Pam Murphy

Journal of the Arkansas Academy of Science

The objective of this paper is to discuss the complexity of fetal movement detection encountered during development and implementation of an automated single Doppler ultrasonic transducer based instrument. The single transducer instrument was intended to better quantify the duration, velocity, and magnitude of fetal movements. A Corometrics Model 116 fetal heart rate monitor was modified, and a fetal movement detection algorithm (Russell Algorithm) was developed to detect fetal movements on one and two (data fusion) transducers. A Hewlett-Packard (HP) M-1350-A fetal monitor and the Russell Algorithm were used to detect and record fetal movements concurrently on sixty patients between the …

An In Vitro Evaluation Of Commercially Available Disposable Prophylaxis Angles, Caren M. Barnes, Lisa S. Fleming, Carl M. Russell

College of Dentistry: Faculty Publications

Although a number of manufacturers are marketing disposable prophylaxis angles, no literature exists regarding the mechanical efficacy and efficiency of these products. It was the purpose of this in vitro evaluation to compare and evaluate five brands of commercially available disposable prophylaxis angles for vibration, noise, heat rise, and torque. Random samples of each brand of disposable prophylaxis angle were utilized. Vibration was measured with a height gauge and running motor; noise was measured with a sound meter and heat rise was measured from 68°F on the head and body of the disposable prophylaxis angles, and torque required to destroy …

An In Vivo Comparison Of Commercially Available Disposable Prophylaxis Angles, Lisa S. Fleming, Caren M. Barnes, Carl M. Russell

College of Dentistry: Faculty Publications

A wide variety of disposable infection control products is being marketed including disposable prophylaxis angles. It was the purpose of this in vivo investigation to evaluate the clinical efficacy of five different brands of commercially available disposable prophylaxis angles. Utilizing a splitmouth design. 11 dental hygienists evaluated disposable prophylaxis angles while completing a routine oral prophylaxis. Fifty samples each of Brahler. Ash/Dentsply, Denticator. and Young Dental angles were compared to a control angle (Teledyne Getz). A questionnaire was completed by each operator following patient treatment (a total of 161 patients was treated). The questionnaire asked questions in which the four …

The Management Of Aerosols With Airpolishing Delivery Systems, Caren M. Barnes

College of Dentistry: Faculty Publications

In summary. aerosol production is inherent with airpolishers. as well as other dental equipment such as handpieces, ultrasonic scalers, and air/water syringes. By practicing prudent infection control techniques and utilizing proper operating techniques, the clinician can continue to enjoy the time-efficient and efficacious benefits of airpolishers, while ensuring a maximum protection from aerosols for the patient and the operator.

The Effects Of Second Molar Extractions In Conjunction With Bionator Treatment, Mohammed Toufic Jeiroudi

Loma Linda University Electronic Theses, Dissertations & Projects

The intent of this paper is to evaluate the effects of second molar extractions in conjunction with Bionator treatments. Eighteen Orthodontic patients were used in this study. All had had second molars extracted. Lateral cephalometric radiographs were traced and used to evaluate the treatment. The average age at time of extraction was 13 years, 3 months. The average treatment time was 38.3 months.

There were some orthopedic changes. The convexity decreased significantly, the condyle axis increased more than expected in normal growth. Also, the lower facial height and facial axis both became more dolichotype (open).

The upper and lower incisors …

Kinesiology Of Knee Flexion Deformity Using Electromyography, Paul J. Roby

Loma Linda University Electronic Theses, Dissertations & Projects

A kinesiological electromyographic study was completed to determine the relative changes in muscle activity as a person walks and stands with different degrees of knee flexion deformity. The ultimate aim was to establish criteria for appropriate preventive and corrective measures relating to knee flexion deformity.

Six different muscles were implanted with wire electrodes. The subjects performed a series of walking and standing experiments with the knee flexed at selected angles by a locking leg brace to simulate knee flexion deformity. The electromyographic action potentials were monitored by analog tapes, oscilloscopes and closed circuit television. The analog tapes were displayed on …

Patient Preference In Two Types Of Colostomy Irrigations, Mildred Ann Marks

Loma Linda University Electronic Theses, Dissertations & Projects

The purposes of this study were threefold: (1) to find which method of colostomy irrigation (enema bag vs. bulb syringe) was best accepted by colostomy patients; (2) to functionally evaluate the two types of colostomy irrigation methods; and (3) to report the results of this study to medical personnel interested in advancements for colostomy irrigations. The population in this study consisted of colostomy patients who had irrigated on a regular basis with the bag technique for a minimum of six months. Twelve colostomates completed this study by recording the parameter of time, amount of irrigation fluid used, quality of return, …

An Evaluation Of Cuspid And Anterior Retraction Using Burstone Mechanics In First Bicuspid Extraction Cases, George Rodney Heath

Loma Linda University Electronic Theses, Dissertations & Projects

This study was conducted to clinically evaluate cuspid and anterior retraction in first bicuspid extraction cases using the Burstone segmented arch technique. More specifically interest was centered on rate of cuspid and anterior retraction, anchorage preservation or control, difficulty of appliance adjustments, time involved and frequency of adjustments, total retraction time, patient discomfort, root resorption, as well as a complete cephalometric appraisal. Six patients were treated for seven months with measurements and records taken to asses (sic) the above desired information.

The results of the patients undergoing lower cuspid retraction showed a mean percentage of 26.0% for the molars and …

Relationship Of Ventilation Ability And Positioning In Left-Sided Congestive Heart Failure Patients, Nancy E. Carson

Loma Linda University Electronic Theses, Dissertations & Projects

Proper positioning is used to relieve dyspnea, edema, and fatigue in congestive heart failure patients. According to the review of literature, improved ventilation as measured by specific lung volumes and lung mechanics occurred with upright positioning in normal persons. The effects of specific changes in lung volumes related to position change in congestive heart failure patients has not been documented in literature, although various recommendations related to positioning are made. This exploratory study was undertaken with nine congestive heart failure patients to see if a relationship existed between degree of head elevation and lung ventilation ability as measured by water-bell …

A Study To Demonstrate The Immediate Destination Of An Embolus Formed In The Lumen Of A Peripheral Venous Catheter, Rosemarie Morikone Emori

Loma Linda University Electronic Theses, Dissertations & Projects

This study was designed to show the immediate destination of an embolus formed in the lumen of an intravenous catheter placed in a peripheral vessel. The hypothesis stated that clots injected into a peripheral vessel will lodge in the lungs. A subhypothesis was that the clot may lodge anywhere along the circulatory pathway.

Indications of need for the study as shown by the review of literature were the following: (1) the complications resulting from the frequent use of intravenous polyethylene catheters, (2) experimental studies that showed that clots were formed around intravenous catheters, (3) the evidence that intravenous catheters predispose …

Biochemical Properties Of Salmonella Potsdam Bacteriophage P4/2, Clyde L. Roggenkamp

Loma Linda University Electronic Theses, Dissertations & Projects

Over 90% recovery of phage P4/2 was realized with differential centrifugation concentration and purification, whereas only about 16% was recovered from the aqueous two-phase polymer - Genetron - ECTEOLA-cellulose column system. Purity of preparations was greatest with the density gradient centrifugation (A₂₆₀ = 2.66 and A₂₈₀ = 1.80 per 10¹² plaque-forming units). With the chemical system of concentration and purification followed by an ECTEOLA anion exchange run, the A₂₆₀ was 6.6 and the A₂₈₀ was 4.3.

Three tests were employed to determine the configuration of P4/2 DNA: (1) a formalin denaturation test, (2) a thermal …

A Simplified Automatic Blood Pressure Recorder, Frank W. Hartman, Vivian G. Behrmann

Henry Ford Hospital Medical Journal

No abstract provided.

Soft X-Rays, William F. Roherty

Bachelors’ Theses

Traditionally, radiation of those wavelengths produced by a potential of from 2 to 25kv. has been classified as "Grenz" or "soft" x-rays. The peculiar property of this radiation is its low penetrating power. While being transparent to more energetic radiation, animal tissue and similar materials are sufficiently opaque to Grenz rays as to be studied in detail. Since the radiation is of the continuous type, it can be made soft enough to reveal any object, providing, of course, that the tube window and object medium be not opaque. Soft x-rays are produced in exactly the same manner as others, except …