Results 201 to 210 of about 83,931 (261)

Adsorption‐Engineered Hydrocarbon Ionomers for Durable Proton‐Exchange Membrane Fuel Cells

Advanced Materials, EarlyView.
Hydrocarbon ionomers suffer from oxidation‐driven interfacial degradation in PEM fuel cell cathodes, leading to catalyst instability. Here, adsorption‐engineered poly(fluorene) ionomers decouple interfacial anchoring from oxidative degradation, enabling strong catalyst–ionomer interactions while resisting electrochemical oxidation.
Heemin Park, Kate Chen, Su Min Ahn, Hengquan Guo, Cy Fujimoto, Jong‐Ho Choi, Lynda Amichi, Danah Kim, Seung Geol Lee, Xiaojing Wang, Jacob S. Spendelow, Sun Young Kang, Panagiotis Bexis, Eun Joo S. Park, Yu Seung Kim   +14 more
wiley   +1 more source

Deep learning approach using SPECT-to-PET translation for attenuation correction in CT-less myocardial perfusion SPECT imaging. [PDF]

Ann Nucl Med
Kawakubo M, Nagao M, Kaimoto Y, Nakao R, Yamamoto A, Kawasaki H, Iwaguchi T, Matsuo Y, Kaneko K, Sakai A, Sakai S.   +10 more
europepmc   +1 more source

Time-of-flight PET/CT suppresses CT based attenuation correction and scatter coincidence correction errors due to misalignment of the gastrointestinal tract. [PDF]

Asia Ocean J Nucl Med Biol
Watanabe Y, Hosokawa S, Takahashi Y.
europepmc   +1 more source

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Attenuation Correction in Echocardiography

Ultrasonic Imaging, 1986
A commercial two-dimensional echo unit, modified to permit digital acquisition (2.2 MHz) of echo signals prior to time-gain-compensation (TGC), was ratiometrically calibrated. Simulating the TGC in software, we demonstrated improvements in image quality as compared to conventional video methods. A path-dependent attenuation correction (PDAC) algorithm,
M, Pincu, G, Schwartz, S R, Corday, Y, Fujibayashi, S, Meerbaum   +4 more
openaire   +3 more sources

A Multivariate Correction for Attenuation

Biometrika, 1975
SUMMARY A method is given for the joint correction for attenuation of all pairwise correlations among p variates, subject to the restriction that the resulting correlation matrix be at least positive-semidefinite. The errors need not be assumed uncorrelated, but their covariance matrix must be positive-definite.
Bock, R. Darrell, Petersen, Anne C.
openaire   +2 more sources

An introduction to attenuation correction

Journal of Nuclear Cardiology, 1999
Attenuation correction techniques have demonstrated improved diagnostic accuracy and quality of myocardial perfusion SPECT images in limited studies. The future success of these methods relies largely on understanding the characteristics of the images and their interpretative meaning, as well as their limitations.
J, Miles, S J, Cullom, J A, Case
openaire   +2 more sources

Measured attenuation correction methods

European Journal of Nuclear Medicine, 1989
Accurate attenuation correction is a prerequisite for the determination of exact local radioactivity concentrations in positron emission tomography. Attenuation correction factors range from 4-5 in brain studies to 50-100 in whole body measurements. This report gives an overview of the different methods of determining the attenuation correction factors
H, Ostertag, W K, Kübler, J, Doll, W J, Lorenz   +3 more
openaire   +2 more sources

The Correction for Attenuation

Educational and Psychological Measurement, 1996
This article examines the statistical correction for attenuation and the controversies surrounding the procedure. Although originally developed for test construction purposes, the correction for attenuation is also used in meta-analysis and assessments of validity generalization.
openaire   +1 more source

A Semiparametric Correction for Attenuation

Journal of the American Statistical Association, 1994
Abstract A correction method is proposed for models including the generalized linear model when the covariate is measured with error. The method requires a separate validation data set that consists of the surrogate W and the true covariate X or an unbiased estimate X⊃ of X.
J. H. Sepanski, R. Knickerbocker, R. J. Carroll   +2 more
openaire   +1 more source

Advances in Attenuation Correction Techniques in PET

PET Clinics, 2007
Molecular imaging using PET has evolved from a vigorous academic field into the clinical arena. Considerable advances have been made in the design of high-resolution standalone PET and combined PET/CT units dedicated to clinical whole-body scanning.
Zaidi H, Montandon ML, Alavi A
openaire   +3 more sources