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Updated: May 15, 2025

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

Published on: September 11, 2011

Counting multiple X-rays per pulse with an avalanche photodiode detector.

Liam T Powers¹, Aidan M Jacobsen², Stephen M Durbin¹

¹Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA.

Journal of Synchrotron Radiation

|April 9, 2025

Summary

Avalanche photodiode detectors (APDs) can now measure more than one X-ray photon per pulse. Digitizing APD signals enables higher count rates for time-resolved synchrotron measurements.

Keywords:

Avalanche photodiode detector X-ray synchrotrons digitized signal analysis

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Published on: January 30, 2020

Area of Science:

Physics
Materials Science
Instrumentation

Background:

Avalanche photodiode detectors (APDs) are crucial for X-ray detection at synchrotrons.
Current limitations restrict APDs to detecting a maximum of one photon per synchrotron pulse.
This significantly hinders time-resolved measurements at high photon flux.

Purpose of the Study:

To overcome the single-photon-per-pulse limitation of APDs at X-ray synchrotrons.
To enable accurate measurement of higher photon count rates.
To expand the applicability of APDs in high-intensity, time-resolved experiments.

Main Methods:

Digitizing the output signals from APD amplifiers.
Implementing advanced signal processing techniques.
Conducting initial measurements at synchrotron facilities.

Main Results:

Demonstrated accurate measurement of a mean count rate of at least four photons per pulse.
Verified that higher count rates are achievable with this method.
Established a new capability for APDs beyond their previous limitations.

Conclusions:

Digitizing APD amplifier outputs significantly enhances their performance at synchrotrons.
This advancement allows APDs to be used for time-resolved measurements at much higher X-ray intensities.
The developed method broadens the scope of synchrotron-based research utilizing APDs.