Program Information
A Region of Interest Reconstruction Method in Digital Tomosynthesis Using Shutter Scan Acquisition
D Kim*, H Lee , D Lee , S Choi , S Choi , B Jo , H Kim , Z Chao , H Kim , Yonsei University, Wonju, Gangwon
Presentations
TU-C1-GePD-I-4 (Tuesday, August 1, 2017) 9:30 AM - 10:00 AM Room: Imaging ePoster Lounge
Purpose: In this study, we proposed a shutter scan acquisition for region of interest (ROI) imaging to reduce the patient exposure dose in digital tomosynthesis system. The purpose of this study was to apply shutter scan acquisition and evaluate the reconstructed image quality in digital tomosynthesis system.
Methods: We used a prototype CDT system (LISTEM, Korea) and the LUNGMAN phantom (Kyoto Kagaku, Japan) with lung nodule in this study. A total of 81 projection data obtained through the shutter scan acquisition consisted of 41 limited field of view projection data and 40 full field of view projection data over a 40° angular range and were reconstructed by FBP algorithm. Truncated projection data obtained by shutter scan acquisition were corrected using laplacian filter and deconvolution. Signal to noise (SNR) and Contrast noise ratio (CNR) of lung nodule were calculated to compare shutter scan acquisition with convenional full view acquisition.
Results: The reconstructed image by shutter scan acquisition without correction has the truncation artifacts. After applying laplacian filter and deconvolution, truncation artifacts have been removed in the reconstructed image. Corrected image showed better image quality compared with reconstructed image by full view acquisition. The region of interest of the reconstructed image showed enhanced contrast. The results showed that the SNR of lung nodule with shutter scan acquisition is higher than that with full view acquisition. Shutter scan acquisition also provides better CNR values.
Conclusion: In this study, proposed shutter scan acquisition and conventional full view acquisition were compared. Using shutter scan acquisition resulted in images with better contrast and higher SNR values in digital tomosynthesis system. In addition, it is expected that the patient exposure dose can be reduced by limiting field of view to focus on region of interest in proposed shutter scan acquisition.
Funding Support, Disclosures, and Conflict of Interest: This research was financially supported by the Ministry of Trade, Industry & Energy (MOTIE), Korea Institute for Advancement of Technology (KIAT) and Gangwon Institute for Regional Program Evaluation (GWIRPE) through the Economic and Regional Cooperation Industry
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