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Is high sensitivity always desirable for a grating-based differential phase contrast imaging system?

Xu Ji1, Ran Zhang1, Ke Li1,2

  • 1Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, WI, 53705, USA.

Medical Physics
|December 25, 2019
PubMed
Summary
This summary is machine-generated.

Increasing system sensitivity in x-ray differential phase contrast (DPC) imaging does not always improve signal-to-noise ratio (SNR). An optimal sensitivity exists, beyond which performance degrades due to phase wrapping effects.

Keywords:
SNRgrating interferometerphase contrast imagingphase wrapping

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Area of Science:

  • Medical Imaging
  • Physics
  • Materials Science

Background:

  • Grating-based x-ray differential phase contrast (DPC) imaging utilizes system sensitivity to measure phase shifts.
  • Higher system sensitivity is generally pursued to improve signal-to-noise ratio (SNR) and imaging performance.
  • This often involves reducing analyzer grating period or increasing grating distances.

Purpose of the Study:

  • To theoretically and experimentally demonstrate an optimal system sensitivity for maximizing SNR in DPC imaging.
  • To investigate the impact of system sensitivity on imaging performance under standard phase-stepping acquisition and retrieval methods.
  • To challenge the conventional belief that higher system sensitivity invariably leads to better imaging outcomes.

Main Methods:

  • Theoretical analysis of phase wrapping effects on signal bias and noise variance in DPC imaging.
  • Quantification of phase wrapping's impact on SNR as a function of system sensitivity.
  • Validation through extensive numerical simulations and experimental studies.

Main Results:

  • SNR in DPC imaging is not solely proportional to system sensitivity due to signal cyclicity and phase wrapping.
  • An optimal sensitivity factor exists for maximizing SNR, dependent on factors like refraction angle and exposure.
  • Exceeding this optimal sensitivity leads to decreased SNR and degraded imaging performance.

Conclusions:

  • System sensitivity increases do not guarantee improved x-ray DPC imaging performance.
  • Phase wrapping effects necessitate an optimal system sensitivity for achieving the highest SNR.
  • Standard phase-stepping acquisition and phase retrieval methods are sensitive to system sensitivity limitations.