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Calibration (0):
Recent article
Calibration
Abstract
The influence of temperature and relative air humidity on the stability of omeprazole (OME) in solid state was studied. Changes in the concentration were monitored by HPLC with UV detection. The method was validated; its selectivity, range of linearity, precision, limit of detection (LOD) and limit o...
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PMID: 21928721
PDF is available here.
PDF is available here.
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Abstract
Sulfurous compounds: sodium sulfite Na2SO3 (E 221), sodium bisulfite NaHSO, (E 222), and sodium metabisulfite Na2S2O5 (E 223) are largely used as antioxidants in many pharmaceutical formulations. A method for determination of sodium metabisulfite in parenteral formulations containing tartrate ions wa...
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PMID: 21928707
PDF is available here.
PDF is available here.
Abstract
Bioanalytical methods are used to quantitatively determine the concentration of drugs, biotransformation products or other specified substances in biological matrices and are often used to provide critical data to pharmacokinetic or bioequivalence studies in support of regulatory sub...
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PMID: 21827269
PDF is available here.
PDF is available here.
Abstract
We evaluated the stability of amoxicillin in those medical devices, with particular focus on both drug concentration and storage temperature. Stability of 20, 40, and 60g/L amoxicillin solutions in 300 mL portable pumps stored at 20 or 35 degrees C was studied by visual examination and drug concentr...
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PMID: 21901990
PDF is available here.
PDF is available here.
Abstract
Abstract
Inaccuracies in the estimation of material properties and errors in the assignment of these properties into finite element models limit the reliability, accuracy, and precision of quantitative computed tomography (QCT)-based finite element analyses of the vertebra. In this work, a new mesh-independen...
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PMID: 21823740
PDF is available here.
PDF is available here.
Abstract
The objective of this study was to undertake an in vivo cross calibration of body composition, whole body bone mineral content (BMC) and bone mineral density (BMD) between a Hologic QDR2000 and a GE Healthcare Lunar Prodigy. Twenty-one subjects attending for routine bone densitometr...
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PMID: 21600823
PDF is available here.
PDF is available here.
Abstract
We simulated relative miscalibration error in 10% increments from -50% to +50% relative to a correctly calibrated FRAX(®) model. We found that small changes in model calibration (even on the order of 10%) had large effects on the number of individuals qualifying for treatment. There was a steep gra...
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PMID: 21723769
PDF is available here.
PDF is available here.
Medical Physics (38)7 2011
Abstract
In nuclear medicine, the activity of a radionuclide is measured with a radionuclide calibrator that often has a calibration coefficient independent of the container type and filling.
To determine the effect of the container on the accuracy of measuring the activity in...
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PMID: 21859006
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.
Abstract
We consider here polymeric scaffold-based perfusion bioreactors, where an interstitial fluid supplies nutrients and oxygen to the growing biomass. At the same time, the fluid-induced shear acts as a physiologically relevant stimulus for the metabolic activity of cells, provided that the shear stress...
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PMID: 20865436
PDF is available here.
PDF is available here.
Medical Physics (38)6 2011
Abstract
A dual modality SPECT-CT prototype system dedicated to uncompressed breast imaging (mammotomography) has been developed. The computed tomography subsystem incorporates an ultrathick K-edge filtration technique producing a quasi-monochromatic x-ray cone beam that optimizes the dose efficiency of the s...
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PMID: 21815398
PDF is available here.
PDF is available here.
Abstract
We argue that the skill-related differences in putting accuracy reflect a process of recalibration. Implications for aiming in golf are discussed....
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PMID: 21659668
PDF is available here.
PDF is available here.
Abstract
We therefore studied complete sets of polyamide monofilaments....
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PMID: 21827443
PDF is available here.
PDF is available here.
Abstract
Standing waves can cause measurement errors when sound-pressure level (SPL) measurements are performed in a closed ear canal, e.g., during probe-microphone system calibration for distortion-product otoacoustic emission (DPOAE) testing. Alternative calibration methods, such as forward-pressure level (...
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PMID: 21568416
PDF is available here.
PDF is available here.
Xenobiotica (41)5 2011
Abstract
This chapter describes the use of reversed-phase HPLC with multichannel coulometric electrochemical detection for the routine, sensitive, and simultaneous measurement of oxidized and reduced CoQ10 and CoQ9 in human plasma and serum. Analytes are first resolved chromatographically prior to electroche...
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PMID: 19082952
PDF is available here.
PDF is available here.
Abstract
The present study was designed to validate an analytical method based on HPLC for the quantitative measurement of the Apigenin-7-O-β-D-glucoside (AGL) in rat plasma after intravenous administration. HPLC analysis was done using a C18 column, UV detection at 335 nm, and a mobile phase of methanol:0.2...
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PMID: 21656359
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
We propose an accurate jaw calibration method based on the Monte Carlo modeling of linac photon beams.
Simulating different jaw misalignments, the dose distribution occurring in the matching region for each particular configuration is precisely known, so we can relate the misalignmen...
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PMID: 21776772
PDF is available here.
PDF is available here.
Medical Physics (38)5 2011
Abstract
The accuracy of QCT-based homogenized finite element (FE) models is strongly related to the accuracy of the prediction of bone volume fraction (BV/TV) from bone mineral density (BMD). The goal of this study was to establish a calibration methodology to relate the BMD computed with QC...
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PMID: 21776797
PDF is available here.
PDF is available here.
Abstract
We demonstrated that two cholesterol oxidation products, specifically cholestane-3β,5α,6β-triol (3β,5α,6β-triol) and 7-ketocholesterol (7-KC), were markedly increased in the plasma of human NPC1 subjects, suggesting a role for these oxysterols in diagnosis of NPC1 disease and evaluation of the...
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PMID: 21518695
PDF is available here.
PDF is available here.
Abstract
Though appropriate image acquisition parameters allow an effective dose below 1 mSv for CT coronary angiography (CTCA) performed with the latest dual-source CT scanners, a single-source 64-detector CT procedure results in a significant radiation dose due to its technical limitations. Therefore, estim...
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PMID: 21525109
PDF is available here.
PDF is available here.
Abstract
In this paper, a quantitative study of acoustic-to-articulatory inversion for vowel speech sounds by analysis-by-synthesis using the Maeda articulatory model is performed. For chain matrix calculation of vocal tract (VT) acoustics, the chain matrix derivatives with respect to area function are calcul...
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PMID: 21476670
PDF is available here.
PDF is available here.
Abstract
Although electrophysiological methods of measuring the hearing sensitivity of pinnipeds are not yet as refined as those for dolphins and porpoises, they appear to be a promising supplement to traditional psychophysical procedures. In order to further standardize electrophysiological methods with pinn...
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PMID: 21476685
PDF is available here.
PDF is available here.
Abstract
Sound propagation in water-saturated granular sediments is known to depend on the sediment porosity, but few data in the literature address both the frequency and porosity dependency. To begin to address this deficiency, a fluidized bed technique was used to control the porosity of an artificial sedi...
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PMID: 21476615
PDF is available here.
PDF is available here.
Abstract
Experimental and theory-based investigations have been carried out on the oxidation and adsorption mechanism of mercury (Hg) on brominated activated carbon (AC). Air containing parts per billion concentrations of Hg was passed over a packed-bed reactor with varying sorbent materials at 140 and 30 deg...
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PMID: 21516937
PDF is available here.
PDF is available here.
Abstract
In disinfection systems, incomplete penetration of chlorine into effluent wastewater particles can result in a residual population of viable microorganisms. In this work, a combined experimental and numerical approach was used to quantify inactivation of microorganisms in effluent pa...
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PMID: 21553587
PDF is available here.
PDF is available here.
Abstract
To develop a new method to rapidly determine and identify Guizhi Fuling capsule by portable acousto-optic tunable filter-near infrared spectroscopy.
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PMID: 21809572
PDF is available here.
PDF is available here.
Medical Physics (38)4 2011
Abstract
In this study, newly formulated XR-RV3 GafChromic film was calibrated with National Institute of Standards and Technology (NIST) traceability for measurement of patient skin dose during fluoroscopically guided interventional procedures.
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PMID: 21626925
PDF is available here.
PDF is available here.
Medical Physics (38)4 2011
Abstract
Scatter and beam hardening are prominent artifacts in x-ray CT. Currently, there is no precorrection method that inherently accounts for tube voltage modulation and shaped prefiltration.
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PMID: 21626957
PDF is available here.
PDF is available here.
Medical Physics (38)4 2011
Abstract
The purposes of this work were: (1) To determine if a spectral method can accurately correct the Cerenkov light effect in plastic scintillation detectors (PSDs) for situations where the Cerenkov light is dominant over the scintillation light and (2) to develop a procedural guideline for accurately de...
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PMID: 21626947
PDF is available here.
PDF is available here.
Abstract
To propose a new noncontrast-enhanced flow-independent angiography sequence based on balanced steady-state free precession (bSSFP) that produces reliable vessel contrast despite the reduced blood flow in the extremities.
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PMID: 21448960
PDF is available here.
PDF is available here.
Abstract
Although the half-value layer (HVL) is one of the important parameters for quality assurance (QA) and quality control (QC), constant monitoring has not been performed because measurements using an ionization chamber (IC) are time-consuming and complicated. To solve these problems, a method using radi...
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PMID: 21437731
PDF is available here.
PDF is available here.
Abstract
Two stable isotope dilution assays were developed for the quantitation of acrolein in fats and oils using [(13)C(3)]-acrolein as the internal standard. First, a direct GC-MS headspace method, followed by an indirect GC-MS method using derivatization with pentafluorophenyl hydrazine, was established....
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PMID: 21401209
PDF is available here.
PDF is available here.
Abstract
I monoclonal antibodies (Mabs) were prepared by hybridoma technique and firstly used to develop a Sudan I immunosensor by immobilizing the Mabs on a gold electrode. o-Mercaptobenzoic acid (MBA) was covalently conjugated on the gold electrode to form a self-assembled monolayer (SAM). The immobilizati...
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PMID: 21315921
PDF is available here.
PDF is available here.
Abstract
A multiplexing liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) method to quantify three proteins in maize leaves was developed and validated. For each protein, a hybrid Q-TRAP mass spectrometer was operated in the information-dependent acquisition (IDA) mode to select optimal p...
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PMID: 21388131
PDF is available here.
PDF is available here.
Abstract
We report a novel approach to instrument MSI technology into a handheld, low-cost, standing-alone, real-time operational device that is suitable for home-based health care. It covers techniques used to produce multiple images at discrete signature wavelengths of tissues with a single shot....
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PMID: 20876006
PDF is available here.
PDF is available here.
Abstract
We suggest a simple unsupervised adaptation method of the linear discriminant analysis (LDA) classifier that effectively solves this problem by counteracting the harmful effect of nonclass-related nonstationarities in electroencephalography (EEG) during BCI sessions performed with motor imagery task...
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PMID: 21095857
PDF is available here.
PDF is available here.
Abstract
This paper presents a novel, magnetic resonance imaging (MRI)-compatible, force sensor suitable for cardiac catheterization procedures. The miniature, fiber-optic sensor is integrated with the tip of a catheter to allow the detection of interaction forces with the cardiac walls. The optical fiber lig...
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PMID: 21118758
PDF is available here.
PDF is available here.
Abstract
The guide is intended for all those interested in measuring human nasal airflow by rhinomanometry, either for clinical or research purposes. The guide is written in non-technical language so that it may be understood by nursing and support staff who may need to make measurements usin...
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PMID: 21468367
PDF is available here.
PDF is available here.
Abstract
Our aim was to evaluate the influence of both calibrators on GH results....
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PMID: 21361855
PDF is available here.
PDF is available here.
Medical Physics (38)3 2011
Abstract
To calibrate a Gamma Knife (GK) Perfexion using TG-21 with updated chamber-dependent values for modern microionization chambers in the new solid water Leksell dosimetry phantom. This work illustrates a calibration method using commercially available equipment, instruments, and an established dosimetr...
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PMID: 21520881
PDF is available here.
PDF is available here.
Medical Physics (38)3 2011
Abstract
Current codes of practice for clinical reference dosimetry of high-energy photon beams in conventional radiotherapy recommend using a 10 x 10 cm2 square field, with the detector at a reference depth of 10 cm in water and 100 cm source to surface distance (SSD) (AAPM TG-51) or 100 cm source-to-axis di...
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PMID: 21520829
PDF is available here.
PDF is available here.
Abstract
We have developed a novel homotopic (same location) measurement methodology utilizing scanning acoustic microscopy (SAM). Homotopic measurements with SAM overcome the problems encountered by other characterization/imaging methods. These measurements provide us with acoustic reflectance at the same l...
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PMID: 21429849
PDF is available here.
PDF is available here.
Abstract
A simple validated LC-UV method for the phytochemical analysis of four bioactive quassinoids, 13alpha(21)-epoxyeurycomanone (EP), eurycomanone (EN), 13alpha,21-dihydroeurycomanone (ED) and eurycomanol (EL) in rat plasma following oral (200 mg/kg) and intravenous administration (10 mg...
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PMID: 21485270
PDF is available here.
PDF is available here.
Abstract
We report the stability, accuracy, and development history of a new left atrial pressure (LAP) sensing system in ambulatory heart failure (HF) patients. A total of 84 patients with advanced HF underwent percutaneous transseptal implantation of the pressure sensor. Quarterly noninvasive calibration by...
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PMID: 20945124
PDF is available here.
PDF is available here.
Abstract
We treat the calibration problem as a convex optimization problem and use the RENA-3's analog-based timing system to correct the measured data for time dispersion effects from correlated noise, PSAPD signal delays and varying signal amplitudes. The direct solution to the optimization problem involve...
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PMID: 20876008
PDF is available here.
PDF is available here.
Abstract
The haemopexin fold is present in almost all life forms and is utilized for carrying out diverse physiological functions. The structure of CP4, a haemopexin-fold protein from cow pea (Vigna unguiculata), was determined at 2.1 Å resolution. The protein exists as a monomer both in solution and in t...
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PMID: 21301085
PDF is available here.
PDF is available here.
Abstract
In forensic medicine autopsy material is primarily investigated to find out the cause of death. But the results of corresponding toxicology measurements often involve more information. With screening methods drugs were detected not being related to the cause of death. Liquid/liquid e...
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PMID: 21434573
PDF is available here.
PDF is available here.
Abstract
A high-performance liquid chromatographic method was developed and validated to determine liquiritin, hesperidin, and glycyrrhizin levels in a traditional Korean medicine, Pyungwi-san (PWS). Reverse-phase chromatography using a C18 column operating at 40oC, and photodiode array detection at 254 nm an...
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PMID: 21380802
PDF is available here.
PDF is available here.
Abstract
We report on novel cross-validating optoacoustic methods for measuring the frequency response of wideband acoustic sensors. The approach developed does not require pre-calibrated hydrophones and therefore can be readily adopted in any existing optoacoustic measurement configuration. The methods are...
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PMID: 21342817
PDF is available here.
PDF is available here.
Bioanalysis (3)3 2011
Abstract
Louis-Philippe Morin is a senior instrument application specialist at Algorithme Pharma, a CRO located in Laval, Canada. He has been working in the bioanalysis industry for the past 10 years where he became a subject matter expert in analytical instrumentation, especially in the MS f...
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PMID: 21320048
PDF is available here.
PDF is available here.
Respiratory Care (56)4 2011
Abstract
We examined the stability and accuracy of P(tcCO(2)) measurements and the performance of a previously described linear interpolation technique designed to correct for calibration drift....
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PMID: 21255486
PDF is available here.
PDF is available here.
Respiratory Care (56)4 2011
Abstract
Few have examined the accuracy of mechanical calibrators used to calibrate metabolic monitors.
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PMID: 21255508
PDF is available here.
PDF is available here.
Abstract
In the Addona et al. paper (Nature Biotechnology 2009), a large-scale multi-site study was performed to quantify Multiple Reaction Monitoring (MRM) measurements of proteins spiked in human plasma. The unlabeled signature peptides derived from the seven target proteins were measured at nine different...
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PMID: 21298095
PDF is available here.
PDF is available here.
Abstract
Three spectrophotometric methods, based on a spectral analysis, are proposed for quantification of ranitidine hydrochloride (RHCl) in the presence of its decomposition product (R-ox) without isolation from the matrix. One of them is a zero-crossing derivative-spectrophotometry. A value of the first d...
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PMID: 21485289
PDF is available here.
PDF is available here.
Abstract
We studied preparation of major PST analogues as calibrants by large-scale cultivation of toxic freshwater cyanobacteria Anabaena circinalis TA04. The cells were steadily grown in 10 L bottle for 28 days. The primary N1-H toxins, C1/C2, were produced at a concentration of 1.3 ±0.1 μmol/L. The intr...
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PMID: 21556170
PDF is available here.
PDF is available here.
Abstract
The systematic under-dosage were corrected by tuning up the MLC-related factors (dosimetric gap and transmission) in treatment planning system (TPS) and further by incorporating the tongue-and groove effect into TPS. Institutions that have performed IMRT DQA measurements over a certain period of tim...
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PMID: 21439096
PDF is available here.
PDF is available here.
Abstract
We show that, contrary to the prevailing hypotheses of the field, the dominant mode of interaction between the brain and skull in mild head acceleration is one of sliding arrested by meninges....
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PMID: 21811560
PDF is available here.
PDF is available here.
Abstract
The methods for quantitative determination of meloxicam and mefenamic acid in pharmaceuticals by classic spectrophotometry - zero order derivative, first and second order derivatives spectrophotometry is described, using "peak - peak" (P-P) and "peak - zero" (P-O) measurements. The calibration curves...
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PMID: 21648185
PDF is available here.
PDF is available here.