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Computed tomography scanning with simultaneous patient translation.

C R Crawford1, K F King

  • 1GE Medical Systems, Milwaukee, Wisconsin 53201.

Medical Physics
|November 1, 1990
PubMed
Summary
This summary is machine-generated.

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This study introduces a method to speed up computed tomography (CT) scans by overlapping patient translation with data acquisition. This technique reduces scan time while maintaining acceptable image quality for certain applications.

Area of Science:

  • Medical Imaging
  • Radiology
  • Biomedical Engineering

Background:

  • Conventional computed tomography (CT) scanning involves stationary patient data acquisition followed by translation to the next slice.
  • This interscan delay limits the speed of acquiring contiguous image slices, potentially missing critical data during patient breathing cycles.

Purpose of the Study:

  • To develop and evaluate methods for reducing total acquisition time in CT imaging.
  • To enable faster scanning by overlapping patient translation with projection data acquisition.
  • To mitigate artifacts introduced by concurrent patient motion during data acquisition.

Main Methods:

  • Computer simulations and volunteer scans on a modified CT scanner were used.
  • A novel approach of overlapping patient translation with data acquisition was implemented.

Related Experiment Videos

  • Weighting schemes and projection modulation were applied to the convolution/backprojection algorithm to reduce artifacts.

    • Main Results:

    • Concurrent patient translation, if ignored, leads to significant structured artifacts in CT reconstructions.
    • Developed weighting schemes effectively reduce structured artifacts, noise, and improve resolution.
    • Preliminary results show tolerable image degradation for specific clinical applications requiring faster scanning.

    Conclusions:

    • Overlapping patient translation with CT data acquisition significantly reduces scan time.
    • Artifacts from concurrent motion can be managed using projection modulation techniques.
    • This method allows for acquiring more slices within a patient's breathing cycle, improving diagnostic potential in time-sensitive situations.