Scaled Attenuation Fields: Improved Realtime Generation Method for Digitally Reconstructed Radiographs

Title
Scaled Attenuation Fields: Improved Realtime Generation Method for Digitally Reconstructed Radiographs
Authors
명대광김영준최진혁이건우
Keywords
Attenuation field; Digitally reconstructed radiographs; Image guidance therapy; Light field; Scaling process
Issue Date
2010-10
Publisher
International Journal of Precision Engineering and Manufacturing
Citation
VOL 11, NO 5, 791-798
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/37856
ISSN
1229-8557
Appears in Collections:
KIST Publication > Article
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