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AJNR Am J Neuroradiol. 2009 Mar;30(3):520-4. doi: 10.3174/ajnr.A1417. Epub 2009 Jan 15.

Topographic analysis of the inferior parietal lobule in high-resolution 3D MR imaging.

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1
Department of Radiology, Ehime University Graduate School of Medicine, Ehime, Japan. ikukosan@m.ehime-u.ac.jp

Abstract

BACKGROUND AND PURPOSE:

Recent functional MR imaging studies have revealed that the inferior parietal lobule (IPL) supports numerous functions; however, the precise organization of the IPL remains unclear. It has been previously reported that the individual components of the IPL show variable morphologic features; thus, any investigations of IPL function must take into account the variable topography of the IPL. However, it is difficult to understand the topography of the IPL only in transaxial and/or sagittal MR images. We generated volume rendering (VR) images of the brain from high-resolution 3D MR imaging data and analyzed the topography of the IPL.

MATERIALS AND METHODS:

Forty healthy volunteers were examined with 1.5T MR imaging, and VR images were generated. Sulcal continuity, sulcal connections, and the gyral pattern of the IPL were investigated.

RESULTS:

The main sulci and gyri were able to be identified excellently on VR images of all volunteers. One long, continuous postcentral sulcus (postCS) was seen in 47.5% and 40% in the right and left hemisphere, respectively. The frequency with which the postCS connected with the anterior end of the IPS was 72.5% and 75% in the right and left, respectively. The gyral pattern of the IPL showed variable morphology.

CONCLUSIONS:

VR images can depict the sulcal continuity and connections of the IPL accurately. VR imaging is a very useful noninvasive technique to observe the topography of the IPL and should contribute to the investigation of functional localization.

PMID:
19147721
DOI:
10.3174/ajnr.A1417
[Indexed for MEDLINE]
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