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Quantitative SPECT/CT-Technique and Clinical Applications.

Philipp Ritt1, Torsten Kuwert2

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Single-photon emission computed tomography/computed tomography (SPECT/CT) advancements enhance image quality and diagnostic confidence. Quantitative SPECT/CT offers precise tracer measurement, improving accuracy in longitudinal studies and treatment monitoring.

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Area of Science:

  • Nuclear Medicine
  • Medical Imaging Technology
  • Radiochemistry

Background:

  • SPECT technology has evolved significantly over 50 years, improving image quality and diagnostic confidence.
  • Key developments include hybrid SPECT/CT systems, attenuation correction, and iterative reconstruction, making SPECT/CT the standard in Nuclear Medicine.
  • Emerging trends involve whole-body imaging and advanced detector technologies like semiconductor detectors for enhanced sensitivity and resolution.

Purpose of the Study:

  • To review the physical and technical fundamentals of SPECT image formation and quantitative SPECT/CT prerequisites.
  • To present achievable quantitative accuracy based on literature.
  • To provide and review clinical applications of quantitative SPECT/CT.

Main Methods:

  • Review of physical and technical principles of SPECT imaging.
  • Analysis of literature data on quantitative SPECT/CT accuracy.
  • Compilation and review of studies on clinical applications of quantitative SPECT/CT.

Main Results:

  • SPECT/CT systems are now preferred over SPECT-only systems due to improved image quality and diagnostic capabilities.
  • Quantitative SPECT/CT, analogous to PET, enables precise tracer quantification (e.g., Bq/mL, SUV), boosting diagnostic accuracy.
  • Literature reports indicate achievable quantitative accuracy and highlight diverse clinical applications.

Conclusions:

  • Quantitative SPECT/CT represents a major innovation, enhancing diagnostic accuracy and confidence, particularly for longitudinal studies and treatment response monitoring.
  • The integration of advanced technologies and quantitative capabilities solidifies SPECT/CT's role as a cornerstone of Nuclear Medicine.
  • Further research and clinical application of quantitative SPECT/CT are expected to expand its utility in patient care.