Title :
A New Method to Get More Robust MTF Curve
Author :
Zhang, Wei ; Wang, Xueli ; Tian-ge Zhuang
Author_Institution :
Dept. of Biomed. Eng., Shanghai Jiao Tong Univ.
Abstract :
This paper presents a method to locate wire center on performance phantom image to get MTF curve during CT spatial resolution measurement. We get the circular edge of the wire area by automatic threshold segmentation and edge tracking. After that, using Hough transform, we can locate the wire center automatically. Compared with old method, it´s immune to noise and more convenient to operate. Experimental results show that new method is accurate and gets less standard deviation sum of x-coordinate and y-coordinate of center point
Keywords :
Hough transforms; computerised tomography; image resolution; image segmentation; medical image processing; optical transfer function; phantoms; CT spatial resolution measurement; Hough transform; automatic threshold segmentation; edge tracking; modulation transfer function; phantom image; robust MTF curve; wire center location; Biomedical engineering; Biomedical measurements; Computed tomography; Fourier transforms; Frequency domain analysis; Imaging phantoms; Medical services; Robustness; Spatial resolution; Wire;
Conference_Titel :
Engineering in Medicine and Biology Society, 2005. IEEE-EMBS 2005. 27th Annual International Conference of the
Conference_Location :
Shanghai
Print_ISBN :
0-7803-8741-4
DOI :
10.1109/IEMBS.2005.1616782
