An algorithm for automatic determination of the respiratory phases in four-dimensional computed tomography

Area of Science:

• Medical Imaging
• Radiology
• Computational Imaging

Background:

• Computed tomography (CT) imaging quality, particularly in the thoracic and abdominal regions, can be degraded by respiratory motion.
• Respiratory-correlated CT techniques synchronize image acquisition with breathing patterns to mitigate motion artifacts.
• Clinical implementation of advanced 4D CT systems requires careful consideration of practical aspects and efficient data processing.

Purpose of the Study:

• To discuss practical aspects of implementing a multi-slice 4D CT scanner with a respiratory gating system in a clinical setting.
• To present a novel algorithm for automatic respiratory phase determination essential for 4D CT image reconstruction.
• To evaluate the clinical utility of the Somatom Sensation Open (Siemens) with the AZ-733V (Anzai) respiratory gating system.

Main Methods:

• Clinical implementation of the Somatom Sensation Open multi-slice 4D CT scanner.
• Integration with the AZ-733V respiratory gating system (RGS) for respiratory motion monitoring.
• Development and application of a new algorithm for automatic respiratory phase determination.
• Reconstruction of 4D CT images using synchronized data.

Main Results:

• The study details practical considerations for integrating a specific 4D CT scanner and RGS in clinical practice.
• A new algorithm for automatic respiratory phase determination was developed and presented.
• The presented methods facilitate improved 4D CT image reconstruction by accurately synchronizing data with respiratory motion.

Conclusions:

• The clinical implementation of 4D CT with respiratory gating systems is feasible and offers improved image quality.
• The novel algorithm for automatic respiratory phase determination is crucial for accurate 4D CT reconstruction.
• This work contributes to the advancement of respiratory-correlated CT imaging for thoracic and abdominal applications.