The Year in Cardiac Imaging

Division of Cardiovascular Diseases and Internal Medicine, Department of Medicine, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA.
Journal of the American College of Cardiology (Impact Factor: 15.34). 04/2011; 57(17):1721-34. DOI: 10.1016/j.jacc.2011.01.018
Source: PubMed

ABSTRACT This review is a sequel to our 3 previous reports highlighting the most important recent literature in single-photon emission computed tomography (SPECT), myocardial perfusion imaging, cardiac positron emission tomography (PET), cardiac computed tomography (CT), and cardiac magnetic resonance imaging (MRI). In contrast to our previous reports, which covered 1 year each, this report covers the English-language literature over a 15-month period from April 1, 2007, to June 30, 2008. The increased length of our coverage period has magnified the difficulty of reaching a decision as to which articles merit inclusion. Our previous decisions have pleased some authors and disappointed others. We have again made every effort to avoid our personal biases in reaching these ever more difficult decisions. Our summary is once again organized around topical themes, reflecting the growing interest in integrated, multimodality imaging to solve clinical problems.

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    ABSTRACT: Hybrid welding technology has received significant attention in the welding of dissimilar materials recently. While, great welding residual stress and deformation often result by the difference of coefficient of thermal expansion This study describes the thermal elastic–plastic analysis using finite element techniques to analyze the thermo mechanical behavior and evaluate the residual stresses and welding distortion on the AZ31B magnesium alloy and 304L steel butt joint in laser-TIG hybrid welding. A new coupled heat source model was developed which combined by double-elliptic planar distribution, double-ellipsoid body distribution and Rotary–Gauss body distribution model. From the results, it can be concluded that the temperature distribution at the hybrid weld region is exposed to faster rate of heating and cooling in hybrid welding than TIG. Furthermore, compared to the welding stress distribution on the TIG weld, residual stress σy is found about 20% higher on hybrid weld joints, and the residual stress on the 304L steel plate is lower than that on the AZ31B magnesium plate.Research highlights► We analyze the thermo mechanical behavior of magnesium alloy and steel butt joint. ► A new coupled heat source model was developed. ► The microstructure on the bonding interface and butt weld were reported. ► Hybrid welding would be helpful for decreasing the welding stress and deformation.
    Computational Materials Science 03/2011; 50(5):1763-1769. DOI:10.1016/j.commatsci.2011.01.011 · 1.88 Impact Factor
  • Revista Española de Medicina Nuclear 08/2006; 25(4):271-275. DOI:10.1157/13090664 · 0.89 Impact Factor
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    ABSTRACT: Various imaging modalities are available to study the heart, including ultrasound, single photon emission computed tomography, positron emission tomography, computed tomography, and magnetic resonance imaging (1-4). These modalities are fundamentally different and, consequently, different information is deduced from the images they generate. This paper describes briefly the physical principles of image generation with positron emission tomography, computed tomography, and magnetic resonance imaging. Heart Metab. 2007;34:33-37.

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