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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Attenuation correction (AC) in positron emission tomography (PET) is being revisited with new methods, especially for PET/MRI systems. Time-of-flight (TOF) data shows promise for improved AC in PET imaging.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Image Reconstruction

Background:

  • Attenuation correction (AC) in quantitative positron emission tomography (PET) was largely considered solved with PET/CT systems.
  • Advances in PET/MRI technology have spurred renewed interest in alternative AC approaches.
  • Early research in AC for PET and single photon emission computed tomography (SPECT) is historically significant.

Purpose of the Study:

  • To provide a comprehensive literature review of simultaneous reconstruction methods for attenuation and activity in PET.
  • To trace the historical development and algorithmic advances in PET and SPECT AC.
  • To explore current and emerging applications of these reconstruction techniques.

Main Methods:

  • Review of theoretical results on simultaneous reconstruction of attenuation and activity.
  • Examination of analytic and iterative algorithms for PET AC, including MLAA and MLACF.
  • Structured account of applications, including organ-specific, PET/MRI, supplemental transmission, and motion-aware scenarios.

Main Results:

  • Time-of-flight (TOF) PET emission data shows significant promise for AC.
  • These TOF-based methods offer potential solutions for PET/MRI AC deficiencies.
  • Advancements may also enhance standalone PET imaging.

Conclusions:

  • Simultaneous reconstruction techniques, particularly those utilizing TOF PET data, represent a significant advancement in attenuation correction.
  • These methods hold the potential to improve both hybrid PET/MRI systems and standalone PET imaging.
  • Continued research in this area is crucial for optimizing quantitative accuracy in emission tomography.