Artifacts in optical projection tomography due to refractive index mismatch: model and correction

TL;DR

This paper models and corrects artifacts in optical projection tomography caused by refractive index mismatch, improving image quality for 3D imaging of biological samples.

Contribution

It introduces a 3D cone beam forward model for RI mismatch and a fast reconstruction method to correct artifacts in OPT images.

Findings

Effective correction of seagull-shaped artifacts in experimental OPT images.

Improved image accuracy in 3D biological imaging.

Model reduces artifacts caused by RI mismatch.

Abstract

Optical Projection Tomography (OPT) is a powerful tool for 3D imaging of mesoscopic samples, thus of great importance to image whole organs for the study of various disease models in life sciences. OPT is able to achieve resolution at a few tens of microns over a large sample volume of several cubic centimeters. However, the reconstructed OPT images often suffer from artifacts caused by different kinds of physical miscalibration. This work focuses on the refractive index (RI) mismatch between the rotating object and the surrounding medium. We derive a 3D cone beam forward model to approximate the effect of RI mismatch and implement a fast and efficient reconstruction method to correct the induced seagull-shaped artifacts on experimental images of fluorescent beads.