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Welcome to the Pubget Medical Subject Headings (MESH) browser. Click on a topic or subtopic below to explore related papers. In the gold box is the most recent paper about the current MESH term, and below are 20 related papers.
Equipment Failure Analysis (0):
Recent article
Equipment Failure Analysis
Abstract
BWR control rods are activated by neutron reactions in the reactor. The dose produced by this activity can affect workers in the area surrounding the storage pool, where activated rods are stored. Monte Carlo (MC) models for neutron activation and dose assessment around the storage pool have been dev...
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PMID: 21093278
PDF is available here.
PDF is available here.
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Abstract
BWR control rods are activated by neutron reactions in the reactor. The dose produced by this activity can affect workers in the area surrounding the storage pool, where activated rods are stored. Monte Carlo (MC) models for neutron activation and dose assessment around the storage pool have been dev...
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PMID: 21093278
PDF is available here.
PDF is available here.
Abstract
Euler angle decomposition and inverse dynamics were used to determine the knee angles and net forces and moments applied to the tibia during kneeling and squatting with and without kneepads for 10 subjects in four postures: squatting (Squat), kneeling on the right knee (One Knee), bilateral kneeling...
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PMID: 21844612
PDF is available here.
PDF is available here.
Oral Oncology (47)9 2011
Abstract
We used a repeated measures design study with 4 randomized groups in a partial cross-over design using 3 consecutive TESPs (3 intervals) in different orders. (Group 1: GULR-GULR-GULR; Group 2: GULR-GULR-Provox2; Group 3: Provox2-Provox2-GULR; and Group 4: Provox2- Provox2-Provox2). Replacement dates...
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PMID: 21733742
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
In dynamic multileaf collimator (MLC) motion tracking with complex intensity-modulated radiation therapy (IMRT) fields, target motion perpendicular to the MLC leaf travel direction can cause beam holds, which increase beam delivery time by up to a factor of 4. As a means to balance d...
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PMID: 21858989
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Purpose: Optically stimulated luminescent detectors (OSLDs) are quickly gaining popularity as passive dosimeters, with applications in medicine for linac output calibration verification, brachytherapy source verification, treatment plan quality assurance, and clinical dose measuremen...
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PMID: 21858992
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Our system can manage the baseline shift and also enables treatment irradiation to be undertaken with high accuracy....
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PMID: 21858994
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
The purpose of this work is to assess the variation in performance of various commercially available dosimetry diodes for quantitative small field dosimetry, specifically by intercomparing measurements of SRS cone factors.
Measurements were made in 6 MV photon beams w...
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PMID: 21859018
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Optoacoustic imaging enables mapping the optical absorption of biological tissue using optical excitation and acoustic detection. Although most image-reconstruction algorithms are based on the assumption of a detector with an isotropic sensitivity, the geometry of the detector often...
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PMID: 21859030
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
To evaluate the feasibility of line-focused ultrasound for thermal ablation of superficially located tumors.
A SonoKnife is a cylindrical-section ultrasound transducer designed to radiate from its concave surface. This geometry generates a line-focus or acoustic edge....
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PMID: 21859038
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
The conditions under which vendor performance criteria for digital radiography systems are obtained do not adequately simulate the conditions of actual clinical imaging with respect to radiographic technique factors, scatter production, and scatter control. Therefore, the relationshi...
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PMID: 21859043
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Small field dosimetry is prone to uncertainties due to the lack of electronic equilibrium and the use of the correct detector size relative to the field size measured. It also exhibits higher sensitivity to setup errors as well as large variation in output with field size and shape....
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PMID: 21859007
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Parallel magnetic resonance imaging (MRI) requires an array of RF coil elements with different sensitivity distributions and with minimal electromagnetic coupling. The goal of this project was to develop a new method based on induced current compensation or elimination (ICE) for impr...
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PMID: 21859008
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Polymethylmethacrylate (PMMA) slab is one of the mostly used phantoms for studying breast dosimetry in mammography. The purpose of this study was to evaluate the equivalence between exposure factors acquired from PMMA slabs and patient cases of different age groups of Taiwanese women...
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PMID: 21859009
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
The increasing need for better image quality and high spatial resolution for successful endovascular image-guided interventions (EIGIs) and the inherent limitations of the state-of-the-art detectors provide motivation to develop a detector system tailored to the specific, demanding requirements of ne...
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PMID: 21859012
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
These results suggest that use of the Abches system can reduce deviations in tumor position to levels below those achieved under free breathing, irrespective of the tumor location.
Respiratory control with high accuracy and reproducibility is required for high-precision radiotherapy...
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PMID: 21859015
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
This work aims at assessing, through experimental measurements and Monte Carlo calculations, the scatter to primary ratio (SPR) for the micro-CT subsystem of the FLEX Triumph preclinical PET-CT scanner to improve its quantitative capabilities.
Experimental measurement...
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PMID: 21859017
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Using magnetic resonance imaging (MRI) for real-time guidance during radiotherapy is an active area of research and development. One aspect of the problem is the influence of the MRI scanner, modeled here as an external magnetic field, on the medical linear accelerator (linac) compon...
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PMID: 21859019
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
To extend the concept of deflecting the tip of a catheter with the magnetic force created in an MRI system through the use of an array of independently controllable steering coils located in the catheter tip, and to present methods for visualization of the catheter and/or surrounding...
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PMID: 21859023
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
The aim of this work is to carry out mechanical and dosimetric assessments on a commercial dynamic micromulti leaf collimator system to be used for stereotactic radiosurgery (SRS) and stereotactic radiotherapy (SRT). Mechanical parameters such as leaf position accuracy with different...
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PMID: 21859024
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Optically stimulated luminescence (OSL) dosimetry has been recently introduced in radiation therapy as a potential alternative to the thermoluminescent dosimeter (TLD) system. The aim of this study was to investigate the feasibility of using OSL point dosimeters in the energy range u...
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PMID: 21859040
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
To propose a quality assurance procedure for routine clinical diffusion tensor imaging (DTI) using the widely available American College of Radiology (ACR) head phantom.
Analysis was performed on the data acquired at 1.5 and 3.0 T on whole body clinical MRI scanners u...
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PMID: 21859042
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Our results showed discrepancies between Monte Carlo techniques (based on energy deposition events) and analytical calculations (based on x-ray attenuation) on QDE. Discrepancies were found to range up to 10% for Gd2O2S:Tb (100 mg/cm2), 7.7% for CsI:T1 (50 mg/cm2), and 8.2% for a-Se (50 mg/cm2). Dis...
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PMID: 21859045
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
To establish a new clinical procedure in frameless stereotactic radiosurgery (SRS) for patient setup verification at treatment couch angles as well as for head-motion monitoring during treatment using video-based optical surface imaging (OSI).
A video-based three-dime...
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PMID: 21858995
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Integration of positron emission tomography (PET) and magnetic resonance (MR) in a merged device requires shielding of the PET detector electronics. The authors demonstrate that a multiple shell setup exhibits advantages over a single shell shielding enclosure.
A sphe...
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PMID: 21858996
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
To create an accurate 6 MV Monte Carlo simulation phase space for the Varian TrueBeam treatment head geometry imported from CAD (computer aided design) without adjusting the input electron phase space parameters.
GEANT4 v4.9.2.p01 was employed to simulate the 6 MV bea...
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PMID: 21858999
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
Design and validate an efficient dual-slot coaxial microwave ablation antenna that produces an approximately spherical heating pattern to match the shape of most abdominal and pulmonary tumor targets.
A dual-slot antenna geometry was utilized for this study. Permutati...
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PMID: 21859025
PDF is available here.
PDF is available here.
Respiratory Care (56)6 2011
Abstract
Abstract
Inhomogeneous and uncontrolled cellular and tissue responses in bone tissue engineering constructs, as a result of heterogeneous oxygen delivery throughout the scaffold volume, is one of the hurdles hampering clinical transfer of cell-scaffold combinations. This study presents an acc...
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PMID: 21332298
PDF is available here.
PDF is available here.
Abstract
We report for the first time the use of DNA hybridization for the controllable assembly of a graphene nanosheet. Moreover, with the help of dynamic light scattering technique, we extended the above studies by exploiting the DNA-graphene dispersed sheets as highly ultrasensitive detection of oligonul...
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PMID: 21534537
PDF is available here.
PDF is available here.
Xenobiotica (41)5 2011
Abstract
Many biosensors depend on molecular recognition reagents to achieve highly sensitive and specific detection levels of an analyte of interest. Although new and improved detection platforms continue to be developed, improvements in the affinity and specificity of the molecular recognition reagents oft...
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PMID: 19159106
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
Three dimensional dose polymer gel dosimetry measurements provide unique information on sophisticated dose distributions. In this study, the authors propose a novel method to improve the accuracy of polymer gel dosimeters by inserting a plastic scintillation detector (PSD) to provide...
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PMID: 21776812
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
The use of magnetic resonance (MR) radiofrequency (RF) surface coils is a prerequisite for high-quality positron emission tomography (PET)/MR imaging. In lack of in-gantry transmission (TX) sources, the exact position of the RF coils is unknown in PET/MR, and may, therefore, lead to...
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PMID: 21776816
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
We have therefore investigated the temperature dependence of the dose response for such dosimeters, regarding both irradiation and storage conditions.
Dosimeter samples in cuvettes were irradiated to 5 Gy. The temperature for the different cuvettes during irradiation and post-irradia...
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PMID: 21776817
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
Several linacs with integrated kilovoltage (kV) imaging have been developed for delivery of image guided radiation therapy (IGRT). High geometric accuracy and coincidence of kV imaging systems and megavoltage (MV) beam delivery are essential for successful image guidance. A geometric...
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PMID: 21776767
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
This study investigates the benefits of a modified flattening filter free (FFF) linac over the standard (STD) linac equipped with the flattening filter. Energy and angular spread of the electron beam of the FFF linac were modified. Modification of FFF beam parameters is explored to m...
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PMID: 21776768
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
We calculated variations in the photon energy spectra of a 6 MV beam as a result of variations of treatment parameters, including field size, measurement location, the presence of heterogeneities, and field modulation. The impact of these spectral variations on the response of the TLD is largely bas...
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PMID: 21776799
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
To develop a liver-mimicking MRI gel phantom for use in the development of temperature mapping and coagulation progress visualization tools needed for the thermal tumor ablation methods, including laser-induced interstitial thermotherapy (LITT) and radiofrequency ablation (RFA)....
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PMID: 21776804
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
Our work demonstrates that PC digital tomosynthesis retains the edge-enhancement observed in planar PC radiograph and further improves soft-tissue conspicuity by reducing the effects of superimposed tissue structure....
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PMID: 21776769
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
Electron radiation therapy is used frequently for the treatment of skin cancers and superficial tumors especially in the absence of kilovoltage treatment units. Head-and-neck treatment sites require accurate dose distribution calculation to minimize dose to critical structures, e.g.,...
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PMID: 21776771
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
A new method to evaluate radiochromic film dosimetry data scanned in multiple color channels is presented. This work was undertaken to demonstrate that the multichannel method is fundamentally superior to the traditional single channel method. The multichannel method allows for the s...
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PMID: 21776787
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
We showed that the PSD system used in this study, which was capable of stem effect removal, can perform accurate dosimetry during 192Ir HDR brachytherapy treatment in a water phantom. The system presented here shows some clear advantages over previously proposed dosimetry systems for HDR brachythera...
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PMID: 21776789
PDF is available here.
PDF is available here.
Abstract
Juvenile idiopathic arthritis (JIA) is a chronic disease of childhood; it causes joint damage which may require surgical intervention, often in the young adult. The aim of this study was to describe the long-term outcome and survival of hip replacement in a group of adult patients with JIA and to det...
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PMID: 21464480
PDF is available here.
PDF is available here.
Abstract
The median POF (IQR; absolute range) required to dislodge each bridging stent-graft from the 6-mm renal branch was 1.89 N (0.47 N; 1.65-2.5) for the 7-mm Viabahn, 1.17 N (0.39 N; 0.68-1.57 N) for the 7-mm Fluency, and 2.08 N (0.49 N; 1.59-2.62 N) for the 7-mm Fluency with a supporting 8-mm Zilver st...
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PMID: 21521056
PDF is available here.
PDF is available here.
Abstract
Monitoring of posture allocations and activities enables accurate estimation of energy expenditure and may aid in obesity prevention and treatment. At present, accurate devices rely on multiple sensors distributed on the body and thus may be too obtrusive for everyday use. This paper presents a novel...
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PMID: 20403783
PDF is available here.
PDF is available here.
Abstract
The goal of ligament balancing in total knee arthroplasty (TKA) is to distribute the tibiofemoral compressive forces symmetrically between the medial and lateral compartments of a well-aligned prosthetic knee, as well as to reestablish a rectangular and identical tibiofemoral gap in both flexion and...
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PMID: 20639169
PDF is available here.
PDF is available here.
Abstract
Sonoporation has been shown to have an important role in biotechnology for gene therapy and drug delivery. This paper presents a novel microfluidic sonoporation system that achieves high rates of cell transfection and cell viability by operating the sonoporation chamber at resonance. The paper presen...
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PMID: 20977982
PDF is available here.
PDF is available here.
Abstract
The aim of this study is to implement a duodenum identification mechanism for capsule endoscopes because commercially available capsule endoscopes sometimes present a false negative diagnosis of the duodenum. One reason for the false negative diagnosis is that the duodenum is the fastest moving part...
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PMID: 21134813
PDF is available here.
PDF is available here.
Abstract
We analyzed 215 pressure-frequency measurements made at the distal tip of the access needle, of which 98 were from nonpericardial, 112 were from pericardial, and five were from ventricular locations. The needle locations as identified by the algorithm were significantly different from each other (p...
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PMID: 21147589
PDF is available here.
PDF is available here.
Abstract
Sperm immobilization is a requisite step in intracytoplasmic sperm injection (ICSI). Conventionally, sperm immobilization is performed manually, which entails long training hours and stringent skills. Manual sperm immobilization also has the limitation of low success rates and poor reproducibility du...
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PMID: 21156388
PDF is available here.
PDF is available here.
Abstract
A new coaxial antenna for microwave ablation therapies is proposed. The antenna design includes a miniaturized choke and an arrowhead cap to facilitate antenna insertion into the tissues. Antenna matching and the shape and dimension of the area of ablated tissue (thermal lesion) obtained in ex vivo c...
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PMID: 21172749
PDF is available here.
PDF is available here.
Abstract
We suggest a novel online adaptation technique that updates the sleep/wake classifier in real time. The objective of the present study was to evaluate the performance of a newly developed adaptive classification algorithm that was embedded on a wearable sleep/wake classification system called SleePi...
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PMID: 21172750
PDF is available here.
PDF is available here.
Abstract
Small mammals, particularly mice, are very useful animal models for biomedical research. Extremely small anatomical dimensions, however, make design of implantable microsystems quite challenging. A method for coupling external fluidic systems to microfluidic channels via in-plane interconnects is pre...
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PMID: 21147591
PDF is available here.
PDF is available here.
Abstract
The label-free technique of optofluidic intracavity spectroscopy (OFIS) uses light transmitted through a cellular body in a microfluidic optical resonator to distinguish different types of cells by their optical properties. The OFIS technique has differentiated canine hemangiosarcoma...
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PMID: 20483694
PDF is available here.
PDF is available here.
Circulation (123)12 2011
Abstract
Abstract
The positional accuracy of multileaf collimators (MLC) is crucial in ensuring precise delivery of intensity-modulated radiotherapy (IMRT). The aim of this planning study was to investigate the dosimetric impact of systematic MLC positional errors on step and shoot IMRT of prostate cancer. A total of...
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PMID: 21409437
PDF is available here.
PDF is available here.
Abstract
The ability to analyze a whole blood sample retrieved from a patient is a critical tool used for diagnosing many diseases and conditions. Real-time blood analyzers are already widely used in point-of-care diagnoses and treatment. Being able to analyze plasma that has been isolated from its whole bloo...
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PMID: 21118761
PDF is available here.
PDF is available here.
Abstract
In this paper, the poly(vinyl alcohol)/poly(epsilon-caprolactone)-PEG-poly(epsilon-caprolactone)/nano-hydroxyapatite (PVA/PCEC/n-HA) composite membranes were prepared by solution casting and evaporation methods. The effect of n-HA content on the properties of the composite membranes...
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PMID: 21449393
PDF is available here.
PDF is available here.
Respiratory Care (56)6 2011
Abstract
It has been pointed out that in the wake of a virulent flu strain, patients with survivable illness will die from lack of resources unless more ventilators are made available. Numerous disaster-type ventilators are available, but few evaluations have been performed.
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PMID: 21333059
PDF is available here.
PDF is available here.
Nano Letters (11)2 2011
Abstract
We employ simple geometrical rules to design a set of nanotopographies able to interfere with focal adhesion establishment during neuronal differentiation. Exploiting nanoimprint lithography techniques on cyclic-olefin-copolymer films, we demonstrate that by varying a single topographical parameter...
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PMID: 21241061
PDF is available here.
PDF is available here.