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Real-Time, Two-Color Stimulated Raman Scattering Imaging of Mouse Brain for Tissue Diagnosis

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Super-resolution imaging in a multiple layer EPID.

Haijian Chen¹, Joerg Rottmann¹, Stephen Sf Yip¹

¹Department of Radiation Oncology, Brigham and Women's Hospital, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA.

Biomedical Physics & Engineering Express

|July 18, 2017

Summary

This summary is machine-generated.

A novel four-layer portal imager with shifted detector layers demonstrates super-resolution imaging. This system significantly enhances resolution and contrast-to-noise ratio for megavoltage imaging applications.

Keywords:

EPID MV-CBCT portal imaging super-resolution imaging

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Area of Science:

Medical Physics
Imaging Technology
Radiotherapy Physics

Background:

Conventional electronic portal imaging devices (EPIDs) have limitations in detective quantum efficiency (DQE).
Improving resolution and contrast-to-noise ratio (CNR) is crucial for megavoltage (MV) planar and cone beam computed tomography (MV-CBCT) applications.
Super-resolution (SR) imaging techniques offer potential for enhanced image quality.

Purpose of the Study:

To investigate the feasibility of achieving super-resolution (SR) imaging using a novel four-layer EPID system.
To evaluate the impact of laterally shifted detector layers on image resolution and CNR.
To assess the performance of the SR system in MV planar and MV-CBCT imaging.

Main Methods:

Construction of a portal imager with four vertically stacked, laterally shifted EPID layers.
Simulations using digital phantoms to assess planar resolution (iron rod grid) and MV-CBCT CNR/resolution (electron density inserts, bar pattern).
Application of SR reconstruction algorithms, including simple shift-add fusion, to combined projections from shifted layers.

Main Results:

The SR reconstruction using shifted layers significantly improved resolution and CNR in both planar and MV-CBCT imaging.
Increasing the number of shifted layers (two, three, four) progressively increased CNR by 40%, 70%, and 99%, respectively.
Lateral shifting by half a pixel nearly doubled image resolution, outperforming aligned layers.

Conclusions:

A four-layer EPID system with laterally shifted layers can achieve significant super-resolution.
This SR approach substantially enhances image resolution and CNR for MV imaging modalities.
The proposed SR imaging system holds promise for improving diagnostic accuracy and treatment efficacy in radiotherapy.