BACKGROUND: To compare different reference images selected for registration among chemical exchange saturation transfer (CEST) series. MATERIALS AND METHODS: Five normal volunteers and eight brain tumor patients were studied on a 3 Tesla scanner. Image registration was performed by choosing each of the acquired CEST saturation or unsaturation dynamic images as the reference. CEST images at 3.5 ppm (amide proton transfer, APT) were computed for each motion-corrected data set after main magnetic field inhomogeneity correction. A uniformity index was defined to quantify the efficacy of image registration using different reference images. Joint histograms and the structural similarity index (SSIM) were used to analyze the intrinsic image similarity between various dynamic images. RESULTS: Image registration increased the average uniformity index by 18% if the 3.5 ppm saturated image was selected as the reference image. However, registering to the unsaturated dynamic image reduced the uniformity index by 13% on average. The joint histogram analysis showed that the saturated dynamic images were highly similar (SSIM = 0.89 ± 0.01), and were considerably different from the unsaturated dynamic image (SSIM = 0.58 ± 0.03). CONCLUSION: The selection of the 3.5 ppm dynamic image as the reference image generated the highest uniformity index for APT imaging though other saturated images were equally suited as reference images.
BACKGROUND: To compare different reference images selected for registration among chemical exchange saturation transfer (CEST) series. MATERIALS AND METHODS: Five normal volunteers and eight brain tumorpatients were studied on a 3 Tesla scanner. Image registration was performed by choosing each of the acquired CEST saturation or unsaturation dynamic images as the reference. CEST images at 3.5 ppm (amide proton transfer, APT) were computed for each motion-corrected data set after main magnetic field inhomogeneity correction. A uniformity index was defined to quantify the efficacy of image registration using different reference images. Joint histograms and the structural similarity index (SSIM) were used to analyze the intrinsic image similarity between various dynamic images. RESULTS: Image registration increased the average uniformity index by 18% if the 3.5 ppm saturated image was selected as the reference image. However, registering to the unsaturated dynamic image reduced the uniformity index by 13% on average. The joint histogram analysis showed that the saturated dynamic images were highly similar (SSIM = 0.89 ± 0.01), and were considerably different from the unsaturated dynamic image (SSIM = 0.58 ± 0.03). CONCLUSION: The selection of the 3.5 ppm dynamic image as the reference image generated the highest uniformity index for APT imaging though other saturated images were equally suited as reference images.
Authors: Jun Hua; Craig K Jones; Jaishri Blakeley; Seth A Smith; Peter C M van Zijl; Jinyuan Zhou Journal: Magn Reson Med Date: 2007-10 Impact factor: 4.668
Authors: Guang Jia; Ronney Abaza; JoAnna D Williams; Debra L Zynger; Jinyuan Zhou; Zarine K Shah; Mitva Patel; Steffen Sammet; Lai Wei; Robert R Bahnson; Michael V Knopp Journal: J Magn Reson Imaging Date: 2011-03 Impact factor: 4.813
Authors: Hye-Young Heo; Yi Zhang; Tina M Burton; Shanshan Jiang; Yansong Zhao; Peter C M van Zijl; Richard Leigh; Jinyuan Zhou Journal: Magn Reson Med Date: 2017-06-21 Impact factor: 4.668
Authors: Shanshan Jiang; Tianyu Zou; Charles G Eberhart; Maria A V Villalobos; Hye-Young Heo; Yi Zhang; Yu Wang; Xianlong Wang; Hao Yu; Yongxing Du; Peter C M van Zijl; Zhibo Wen; Jinyuan Zhou Journal: Magn Reson Med Date: 2017-07-16 Impact factor: 4.668
Authors: Hye-Young Heo; Zheng Han; Shanshan Jiang; Michael Schär; Peter C M van Zijl; Jinyuan Zhou Journal: Neuroimage Date: 2019-01-14 Impact factor: 6.556