Scaled Attenuation Fields: Improved Realtime Generation Method for Digitally Reconstructed Radiographs
- Scaled Attenuation Fields: Improved Realtime Generation Method for Digitally Reconstructed Radiographs
- 명대광; 김영준; 최진혁; 이건우
- Attenuation field; Digitally reconstructed radiographs; Image guidance therapy; Light field; Scaling process
- Issue Date
- International Journal of Precision Engineering and Manufacturing
- VOL 11, NO 5, 791-798
- Image guidance technology has made it possible for a system to track the location of a patient’s bones or lesions
in real time while the patient undergoes medical treatment, with a specific part of the patient’s body serving as the
reference. To this end, intraoperative 2D X-ray images and preoperative 3D CT images are continuously
registered at specific intervals. The implementation of such a system requires a quick and efficient generation
algorithm for digitally reconstructed radiograph (DRR). Since the generation of a DRR from CT by ray casting
has a time complexity of O(n3), it cannot be generated at a speed sufficient for real-time tracking of the location of
the patient during an operation. As a solution to this problem, this study proposes scaled attenuation fields (SAFs).
In this study, the time complexity of the DRR generation process is reduced to O(n2), thus allowing a speed
sufficiently fast for real-time image registration. In addition, by scaling CT data while generating the attenuation
fields, bones, which serve as the reference for image registration, can be more clearly distinguished from fat or
muscles, thus improving the accuracy of the system.
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