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Determination of Crystal Structures

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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A New Positioning Algorithm for Position-Sensitive Avalanche Photodiodes.

Jin Zhang¹, Peter D Olcott, Craig S Levin

¹Department of Radiology and Molecular Imaging Program, Stanford University, Stanford, CA 94305 USA.

IEEE Transactions on Nuclear Science

|December 6, 2013

Summary

This summary is machine-generated.

A new algorithm for positron emission tomography (PET) cameras significantly reduces spatial distortion. This method improves image quality by refining how position sensitive avalanche photodiodes (PSAPDs) pinpoint interactions.

Keywords:

Avalanche photodiode positioning algorithm positron emission tomography

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Area of Science:

Medical Imaging
Nuclear Physics
Detector Technology

Background:

Positron Emission Tomography (PET) imaging relies on accurate event localization.
Traditional Anger-like positioning algorithms for Position Sensitive Avalanche Photodiodes (PSAPDs) introduce significant spatial "pin-cushion" distortion.
This distortion complicates image reconstruction and reduces overall resolution in PET cameras.

Purpose of the Study:

To develop and evaluate an improved positioning algorithm for PSAPDs in PET cameras.
To mitigate the "pin-cushion" distortion inherent in existing algorithms.
To enhance the spatial accuracy of interaction point determination in PET detectors.

Main Methods:

A novel positioning algorithm was developed, combining diagonal corner signals of the PSAPD.
A 45° rotation was applied to determine X or Y positions, improving upon the standard four-corner readout.
The new algorithm was tested using LSO crystal arrays (3x4 of 2x2x3 mm³ and 3x8 of 1x1x3 mm³) coupled to 8x8 mm² PSAPDs.

Main Results:

The improved algorithm significantly reduced "pin-cushion" distortion in raw flood histogram images.
Flood positioning histogram data demonstrated superior linearity compared to the conventional Anger-like method.
The new algorithm provides more accurate crystal positioning, crucial for high-resolution PET.

Conclusions:

The developed positioning algorithm offers a substantial improvement for PSAPD-based PET camera construction.
Reduced spatial distortion leads to more accurate event localization and potentially higher PET image quality.
This advancement contributes to the development of next-generation, high-resolution PET systems.