document: Automated cerebrum segmentation from three-dimensional sagittal brain MR images We present a fully automated cerebrum segmentation algorithm for full three-dimensional sagittal brain MR images . First , cerebrum segmentation from a midsagittal brain MR image is performed utilizing landmarks , anatomical information , and a connectivity-based threshold segmentation algorithm as previously reported . Recognizing that the cerebrum in laterally adjacent slices tends to have similar size and shape , we use the cerebrum segmentation result from the midsagittal brain MR image as a mask to guide cerebrum segmentation in adjacent lateral slices in an iterative fashion . This masking operation yields a masked image -LRB- preliminary cerebrum segmentation -RRB- for the next lateral slice , which may truncate brain region -LRB- s -RRB- . Truncated regions are restored by first finding end points of their boundaries , by comparing the mask image and masked image boundaries , and then applying a connectivity-based algorithm . The resulting final extracted cerebrum image for this slice is then used as a mask for the next lateral slice . The algorithm yielded satisfactory fully automated cerebrum segmentations in three-dimensional sagittal brain MR images , and had performance superior to conventional edge detection algorithms for segmentation of cerebrum from 3D sagittal brain MR images
doc_bio_tags: O O O O O O O O O O O O B I I I I O O O O O O O O O O O O O O B I I I O O O B O B I O O O O O O O O O O O O O O O O B I I O O O O O O O O O O O O O O O O B I I I O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
extractive_keyphrases: fully automated cerebrum segmentation algorithm midsagittal brain mr image landmarks anatomical information laterally adjacent slices masking operation masked image boundaries
abstractive_keyphrases: full 3d sagittal brain mr images connectivity-based threshold segmentation algorithm brain region truncation boundary end points connectivity-based algorithm