CBCT/CBDT equipped with the x-ray projection system for image-guided proton therapy

Min Kook Cho; Jin Sung Kim; Young-Bin Cho; Hanbean Youn; Sung Yong Park; Seungryong Cho; Ho Kyung Kim

doi:10.1117/12.811525

13 March 2009 CBCT/CBDT equipped with the x-ray projection system for image-guided proton therapy

Min Kook Cho, Jin Sung Kim, Young-Bin Cho, Hanbean Youn, Sung Yong Park, Seungryong Cho, Ho Kyung Kim

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72582V (2009) https://doi.org/10.1117/12.811525
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

For image-guided proton therapy, we investigated the feasibility of CBCT (cone-beam computed tomography) and CBDT (cone-beam digital tomosynthesis) technologies in the gantry treatment room. A fully equipped x-ray projection system, which was originally operated for patient alignment, in parallel to proton-beam direction was utilized for acquiring CBCT/CBDT. The performance of the imaging detector was analyzed in terms of MTF (modulation-transfer function), NPS (noise-power spectrum) and DQE (detective quantum efficiency). Tomographic imaging performances, such as spatial resolving power, linearity of CT numbers, SNR (signal-to-noise ratio), and CNR (contrast-to-noise ratio), were analyzed by using the AAPM (American Association of Physicists in Medicine) CT QC phantom. Geometric alignment of CBCT/CBDT system was analyzed by using a calibration phantom, which consists of steal ball bearings. The determined calibration parameters were applied to the image reconstruction procedures. The overall CBCT performances of the system were demonstrated with reconstructed humanoid phantom images. In addition, we implemented the CBDT with a selected number of projection views acquired for CBCT in limited angle ranges. From the reconstructed phantom images, the CBCT system in the gantry treatment room will be very useful as a primary patient alignment system for image-guided proton therapy. The CBDT may provide fast patient positioning with less motion artifact and patient doses.

Citation Download Citation

Min Kook Cho, Jin Sung Kim, Young-Bin Cho, Hanbean Youn, Sung Yong Park, Seungryong Cho, and Ho Kyung Kim "CBCT/CBDT equipped with the x-ray projection system for image-guided proton therapy", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72582V (13 March 2009); https://doi.org/10.1117/12.811525

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