Correction of geometric distortion in Propeller echo planar imaging using a modified reversed gradient approach

被引:11
作者
Chang, Hing-Chiu [1 ,2 ]
Chuang, Tzu-Chao [3 ]
Lin, Yi-Ru [4 ]
Wang, Fu-Nien [5 ]
Huang, Teng-Yi
Chung, Hsiao-Wen [2 ]
机构
[1] Duke Univ, Brain Imaging & Anal Ctr, Med Ctr, Durham, NC 27706 USA
[2] Natl Taiwan Univ, Dept Elect Engn, Taipei, Taiwan
[3] Natl Sun Yat Sen Univ, Dept Elect Engn, Kaohsiung, Taiwan
[4] Natl Taiwan Univ Sci & Technol, Dept Elect & Comp Engn, EE-707,43 Sec 4,Keelung Rd, Taipei, Taiwan
[5] Natl Tsing Hua Univ, Dept Biomed Engn & Environm Sci, Hsinchu, Taiwan
关键词
Correction of geometric distortion; Propeller-EPI imaging; modified reversed gradient approach;
D O I
10.3978/j.issn.2223-4292.2013.03.05
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Objective: This study investigates the application of a modified reversed gradient algorithm to the Propeller-EPI imaging method (periodically rotated overlapping parallel lines with enhanced reconstruction based on echo-planar imaging readout) for corrections of geometric distortions due to the EPI readout. Materials and methods: Propeller-EPI acquisition was executed with 360-degree rotational coverage of the k-space, from which the image pairs with opposite phase-encoding gradient polarities were extracted for reversed gradient geometric and intensity corrections. The spatial displacements obtained on a pixel-by-pixel basis were fitted using a two-dimensional polynomial followed by low-pass filtering to assure correction reliability in low-signal regions. Single-shot EPI images were obtained on a phantom, whereas high spatial resolution T2-weighted and diffusion tensor Propeller-EPI data were acquired in vivo from healthy subjects at 3.0 Tesla, to demonstrate the effectiveness of the proposed algorithm. Results: Phantom images show success of the smoothed displacement map concept in providing improvements of the geometric corrections at low-signal regions. Human brain images demonstrate prominently superior reconstruction quality of Propeller-EPI images with modified reversed gradient corrections as compared with those obtained without corrections, as evidenced from verification against the distortion-free fast spin-echo images at the same level. Conclusions: The modified reversed gradient method is an effective approach to obtain high-resolution Propeller-EPI images with substantially reduced artifacts.
引用
收藏
页码:73 / 81
页数:9
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