ESTRO 2023 - Abstract Book

S1398

Digital Posters

ESTRO 2023

Results We demonstrate the effectiveness of our method with MVCT reconstruction. We reconstruct full scan MVCT which is clinically used in tomotherapy, and spare view (1/10-view projection) MVCT with 1) IR, 2) IR+TV, 3) DIP reconstruction, and 4) the proposed method. We evaluate image quality by using SSIM and PSNR with a full scan MVCT image as the ground truth. The results of reconstructed images are shown in Figure 2 with the values of the metrics. The proposed method achieved the best results among 1)~4), while the IR+TV and the DIP are compatible with each other with respect to SSIM and PSNR. Although the IR+TV reduces the artifacts and tends to produce flat regions, the boundaries of tiny structures in the image are blurred. In contrast, our method captures tiny structures of the full scan MVCT image with reducing the artifacts and noises.

Conclusion The proposed method improves the image quality of sparse view MVCT images without a large amount of training data. The performance of our method exceeds those of the traditional data-free methods such as the IR+TV and the DIP. This method can be potentially applied to clinical usages such as in dose reduction of MVCT, 4D MVCT, and a fast MVCT sinogram acquisition. Furthermore, our method can be applied to not only MVCT but also CBCT and other CT modalities.

PO-1688 Diffusion MRI: modeling and processing of images for planning of intracranial pathology radiotherapy

K. Pomozova 1 , G. Gorlachev 2 , A. Chernyaev 3 , A. Golanov 4

1 Federal State Autonomous Institution «N. N. Burdenko National Medical Research Center of Neurosurgery» of the Ministry of Health of the Russian Federation, Radiotherapy and radiosurgery, Moscow, Russian Federation; 2 GBUZ Moscow Clinical