Use of image fusion in radiosurgery treatment planning can reduce systematic MR image distortion

K. L. Boedeker, T. D. Solberg, R. Fogg, A. A F DeSalles, M. T. Selch, J. J. DeMarco, J. B. Smathers

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Geometrical image accuracy in radiosurgical treatment planning is of paramount importance. Several reports have suggested that magnetic susceptibility artifacts may cause spatial distortion in MR images. We have performed a systematic evaluation of the spatial accuracy of MR images relative to x-ray CT. Sections of a 5 French angiography catheter cut to a length of 5 mm and filled with a CuSO 4 solution were used in a common CT/MR phantom; additional markers were attached to the head ring of stereotactic patients. These markers, as well as anatomical structures, were identified on multiple CT and fused and non-fused axial and coronal MR slices. Two commercial radiosurgery treatment planning systems were used to perform the image fusion; one system allows manual manipulation based on visual queues. The lateral, anterior/posterior (AP), and axial (vertical) coordinates of the center-of-mass of the fiducial markers and internal anatomical landmarks were subsequently recorded. The deviation of fused and non-fused MR relative to CT was determined in each of the three principle directions. In analyzing any random or systematic displacement, both the true mean, including negative values as well as positive, and the mean of the absolute deviation were calculated. The 3-dimensional displacement, computed as [x 2+y 2+z 2] 1/2, was also recorded. While Lateral or axial deviations were observed to be essentially random, results suggest a systematic shift in the AP dimension (posteriorally), corresponding to the frequency encoding direction on axial MR images. A comparison of fused and non-fused MR images sets suggests that image fusion can reduce this posterior shift.

Original languageEnglish (US)
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
EditorsJ.D Enderle
Pages1054-1057
Number of pages4
Volume2
StatePublished - 2000
Event22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Chicago, IL, United States
Duration: Jul 23 2000Jul 28 2000

Other

Other22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society
CountryUnited States
CityChicago, IL
Period7/23/007/28/00

ASJC Scopus subject areas

  • Bioengineering

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  • Cite this

    Boedeker, K. L., Solberg, T. D., Fogg, R., DeSalles, A. A. F., Selch, M. T., DeMarco, J. J., & Smathers, J. B. (2000). Use of image fusion in radiosurgery treatment planning can reduce systematic MR image distortion. In J. D. Enderle (Ed.), Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings (Vol. 2, pp. 1054-1057)