External reference markers for the correction of head rotation in brain single-photon emission tomography
- 34 Downloads
Accurate reorientation of brain single-photon emission tomography (SPET) is required for quantitative procedures and for correlation with other imaging modalities. Traditionally, brain SPET has utilized reoriented slices parallel to the orbitomeatal line (OML). Reorientation using internal landmarks would be more convenient but has not been systematically compared with the use of external landmarks. We compared the interobserver reproducibility for defining the sagittal and coronal angular deviations using internal landmarks, a visual method based upon external reference markers, and an automated method based upon external reference markers. Internal landmarks were inaccurate for defining the OML whether this was based upon the frontal-occipital or frontal-cerebellar plane. External reference markers resulted in significantly lower interobserver differences for both sagittal and coronal reorientation. An operator-independent implementation proved to be feasible and provided an objective measure of marker coplanarity. In summary, external reference markers should be used when reproducible reorientation and ROI placement are required.
Key wordsSingle-photon emission tomography Reorientation Neuroimaging
Unable to display preview. Download preview PDF.
- 2.Costa DC, Ell PJ.Brain blood flow in neurology and psychiatry. Edinburgh London Melbourne New York: Churchill Livingstone, 1991.Google Scholar
- 5.Waldemar G, Hasselbach SG, Anderson AR, Delecluse F, Petersen P, Johnsen A, Paulson OB.99mTc-d,1-HMPAO and SPECT of the brain in normal aging.J Cereb Blood Flow Metab 1991: 2:508–521.Google Scholar
- 13.Zhang J, Levesque MF, Wilson CL, Harper RM, Engel J, Lufkin R, Behnke EJ. Multimodality imaging of brain structures for stereotactic surgery.Radiology 1991; 175: 435–441.Google Scholar