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Adjusting a Traverse

Adjusting a Traverse

In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...

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Updated: Sep 11, 2025

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

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Published on: September 11, 2011

Mitigating reconstruction errors in extended-ptychography with adaptive scanning position correction.

Feng Gao, Suhas P Veetil, Xiaoliang He

|August 12, 2025

Summary

This summary is machine-generated.

This study introduces a new calibration method to fix errors in ptychographic imaging reconstructions. The approach enhances accuracy for optical element measurements by correcting probe phase errors and object distortions.

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Last Updated: Sep 11, 2025

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Area of Science:

Computational imaging
Optical metrology
Phase retrieval

Background:

Ptychography simplifies imaging without prior knowledge of probe or scanning positions.
Extended ptychographic iterative engine (ePIE) with adaptive scanning is a common method.
Reconstructed images often contain quadratic phase errors and size distortions.

Purpose of the Study:

To develop and validate a novel calibration method for reconstruction errors in ptychography.
To improve the accuracy of ptychographic imaging, especially for optical element measurements.

Main Methods:

Theoretical analysis of reconstruction errors.
Numerical simulations to validate the proposed calibration method.
Experimental verification using ptychographic imaging.

Main Results:

Demonstrated significant quadratic phase errors in reconstructed illuminations.
Observed slight size distortions in reconstructed objects.
Validated the proposed calibration method's effectiveness in reducing errors.

Conclusions:

The novel calibration method effectively reduces reconstruction errors in ptychography.
The approach enhances the accuracy of ptychographic imaging for optical element characterization.
This work addresses limitations of ePIE with adaptive scanning position correction.