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Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography

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A technique for spatial resolution improvement in helium-beam radiography.

C Amato^1,2,3, M Martisikova^1,2, T Gehrke^1,2,4

¹Department of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany.

Medical Physics

|January 30, 2020

Summary

This study demonstrates that increasing helium beam energy in radiography improves spatial resolution (SR) by reducing particle scattering. This technique, using an energy degrader, enhances image clarity for medical imaging applications.

Keywords:

energy degrader helium-beam radiography ion-beam imaging ion-beam radiotherapy silicon pixel detector spatial resolution

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Area of Science:

Medical Imaging
Particle Physics
Radiography

Background:

Ion-beam radiography has lower spatial resolution (SR) than X-ray radiography due to ion scattering.
Multiple Coulomb scattering (MCS) significantly limits SR in ion radiography.

Purpose of the Study:

To develop a novel technique for improving spatial resolution in helium-beam radiography.
To investigate the use of increased helium-beam energies to decrease MCS and enhance SR.

Main Methods:

Utilized a dedicated ion-tracking imaging system with silicon detectors (Timepix).
Employed four helium beams with energies from 168.8 to 220.5 MeV/u to image a PMMA phantom.
Implemented an energy degrader (ED) to manage ion range and evaluated SR, contrast-to-noise ratio (CNR), and water equivalent thickness (WET) precision.

Main Results:

Achieved a 30% increase in SR with rising beam energy, reaching 0.69 lp/mm.
Observed a 22-32% decrease in CNR with increasing energy, while CNR remained above 6.
Reported single-ion WET precision between 1.2% and 1.5%.

Conclusions:

Experimentally validated that increasing helium beam energy with an ED improves SR in radiography.
Demonstrated a significant SR enhancement with an acceptable reduction in CNR.
Confirmed the utility of EDs for generating energy-deposition radiographs using higher beam energies.