3D Image Reconstruction with Minimum Radiation Exposure and its Applications to Interventional Radiology (Final Report)
The key challenge of improving modern interventional radiology is performing high-quality image reconstruction while minimizing the amount of radiation exposure to patient. This project was designed to answer this challenge.
Data Collection
We have collected two image data sets using the C-arm unit in UNM Radiology Department. One image set is from an ACR CT phantom and the other image set is from a head phantom. These two images sets are collected to complement each other. The ACR CT phantom provides a spectrum of materials of different densities and is ideal for detailed testing of an image reconstruction algorithm. The head phantom is more complex and includes an array of different anatomical structures.
For the ACR phantom, fluoro images are collected at longitude angles from -90° to +90° for the latitude angles of 0°, ±15°, ±30°, -45°, -60°. For the head phantom, fluro images are collected at longitude angels from -90° to +90° for the latitude angles of 0°, ±15°, ±30°, +45°, +60°. The longitude direction scans are performed at about 1° angular interval. The latitude angles are picked at 5° angular interval within the machine mechanical limitations.
Volumetric Reconstruction
Preliminary volumetric reconstructions are performed using algorithms based on compressive sensing. The results are shown in the figure. The reconstruction uses 1/10 of the views, or 22 in total.
Ongoing Research
As can be seen from our preliminary results, our reconstructions algorithm is not perfect but shows are lot of promise.
Contact: Shuang (Sean) Luan, Ph.D., sluan@cs.unm.edu
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