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Locating the reference point of symphysis pubis in axial CT images

 Jiyong Oh  ;  Dae Chul Jung  ;  Chong-Ho Choi 
 Journal of Digital Imaging, Vol.25(1) : 110-120, 2012 
Journal Title
 Journal of Digital Imaging 
Issue Date
Diagnosis, Computer-Assisted/methods ; Humans ; Image Processing, Computer-Assisted* ; Pattern Recognition, Automated ; Pelvic Neoplasms/radiotherapy* ; Pubic Symphysis/diagnostic imaging* ; Radiotherapy Dosage ; Radiotherapy Planning, Computer-Assisted/methods* ; Reference Standards ; Tomography, X-Ray Computed/methods*
Computer-aided diagnosis (CAD) ; Image registration ; Pattern recognition ; Computed tomography ; Symphysis pubis ; Haar-like features ; Biased discriminant analysis
In this paper, we present an effective method to determine the reference point of symphysis pubis (SP) in an axial stack of CT images to facilitate image registration for pelvic cancer treatment. In order to reduce the computational time, the proposed method consists of two detection parts, the coarse detector, and the fine detector. The detectors check each image patch whether it contains the characteristic structure of SP. The coarse detector roughly determines the location of the reference point of SP using three types of information, which are the location and intensity of an image patch, the SP appearance, and the geometrical structure of SP. The fine detector examines around the location found by the coarse detection to refine the location of the reference point of SP. In the experiment, the average location error of the propose method was 2.23 mm, which was about the side length of two pixels. Considering that the average location error by a radiologist is 0.77 mm, the proposed method finds the reference point quite accurately. Since it takes about 10 s to locate the reference point from a stack of CT images, it is fast enough to use in real time to facilitate image registration of CT images for pelvic cancer treatment.
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1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Jung, Dae Chul(정대철) ORCID logo https://orcid.org/0000-0001-5769-5083
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