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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Solid-State Detector SPECT Myocardial Perfusion Imaging.

Piotr J Slomka1, Robert J H Miller2, Lien-Hsin Hu2,3

  • 1Department of Imaging, Medicine, and Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles. California; and slomkap@cshs.org.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|August 4, 2019
PubMed
Summary
This summary is machine-generated.

New solid-state SPECT cameras offer faster, lower-dose cardiac imaging with high accuracy. This technology enhances myocardial perfusion imaging (MPI) and enables new methods for assessing blood flow, improving diagnostic and prognostic capabilities.

Keywords:
SPECT MPIinstrumentationsolid-state SPECT

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Area of Science:

  • Nuclear Medicine
  • Cardiovascular Imaging
  • Medical Physics

Background:

  • Traditional SPECT imaging has limitations in speed and radiation dose.
  • Advancements in detector technology and collimator design are crucial for improving cardiac imaging.
  • Solid-state detectors offer superior energy resolution compared to conventional systems.

Purpose of the Study:

  • To review the state-of-the-art in solid-state SPECT myocardial perfusion imaging (MPI) technology.
  • To discuss the clinical applications and emerging techniques for SPECT MPI flow estimation.
  • To summarize imaging protocols, potential pitfalls, and validation data for solid-state SPECT.

Main Methods:

  • Review of recent advancements in solid-state SPECT camera systems for cardiac imaging.
  • Analysis of improved photon sensitivity and image resolution from new crystals and collimators.
  • Evaluation of emerging techniques for myocardial blood flow assessment using early dynamic imaging.

Main Results:

  • Solid-state SPECT systems significantly reduce imaging time and radiation dose while maintaining diagnostic accuracy.
  • Enhanced photon sensitivity and image resolution improve myocardial perfusion imaging (MPI).
  • Early dynamic imaging with SPECT enables novel myocardial blood flow assessment.

Conclusions:

  • Solid-state SPECT represents an evolutionary leap in cardiac imaging, offering faster and lower-dose MPI.
  • Emerging techniques and hybrid SPECT/CT systems hold significant clinical potential.
  • This technology demonstrates validated diagnostic and prognostic value in large-scale studies.