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• W2019335053 abstract "magnetic resonance spectroscopic imaging (MRSI) can improve the accuracy of target delineation for gliomas, but it lacks the anatomic resolution needed for image fusion. This paper presents a simple protocol for fusing simulation computer tomography (CT) and MRSI images for glioma intensity‐modulated radiotherapy (IMRT), including a retrospective study of 12 patients. Each patient first underwent whole‐brain axial fluid‐attenuated‐inversion‐recovery (FLAIR) MRI (3 mm slice thickness, no spacing), followed by three‐dimensional (3D) MRSI measurements (TE/TR: ) of a user‐specified volume encompassing the extent of the tumor. The nominal voxel size of MRSI ranged from to . A system was developed to grade the tumor using the choline‐to‐creatine (Cho/Cr) ratios from each MRSI voxel. The merged MRSI images were then generated by replacing the Cho/Cr value of each MRSI voxel with intensities according to the Cho/Cr grades, and resampling the poorer‐resolution Cho/Cr map into the higher‐resolution FLAIR image space. The FUNCTOOL processing software was also used to create the screen‐dumped MRSI images in which these data were overlaid with each FLAIR MRI image. The screen‐dumped MRSI images were manually translated and fused with the FLAIR MRI images. Since the merged MRSI images were intrinsically fused with the FLAIR MRI images, they were also registered with the screen‐dumped MRSI images. The position of the MRSI volume on the merged MRSI images was compared with that of the screen‐dumped MRSI images and was shifted until agreement was within a predetermined tolerance. Three clinical target volumes (CTVs) were then contoured on the FLAIR MRI images corresponding to the Cho/Cr grades. Finally, the FLAIR MRI images were fused with the simulation CT images using a mutual‐information algorithm, yielding an IMRT plan that simultaneously delivers three different dose levels to the three CTVs. The image‐fusion protocol was tested on 12 (six high‐grade and six low‐grade) glioma patients. The average agreement of the MRSI volume position on the screen‐dumped MRSI images and the merged MRSI images was 0.29 mm with a standard deviation of 0.07 mm. Of all the voxels with Cho/Cr grade one or above, the distribution of Cho/Cr grade was found to correlate with the glioma grade from pathologic finding and is consistent with literature results indicating Cho/Cr elevation as a marker for malignancy. In conclusion, an image‐fusion protocol was developed that successfully incorporates MRSI information into the IMRT treatment plan for glioma." @default.
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• W2019335053 date "2005-12-19" @default.
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• W2019335053 title "Image-fusion of MR spectroscopic images for treatment planning of gliomas" @default.
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• W2019335053 doi "https://doi.org/10.1118/1.2128497" @default.
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