Abstract：
:In order to guide the needle to the correct location in 3D US-guided brachytherapy, the needle is continuously tracked as it is being inserted. A pre-scan before the needle insertion and a post-scan after the needle insertion are subtracted to obtain a difference image containing the needle. The image is projected along two orthogonal directions approximately perpendicular to the needle, and the 3D needle is reconstructed from the segmented needles in the two projected images. The seeds implanted with the needle are located in the cropped volume along the needle. Thus, the seeds are segmented using a tri-bar model and 3D line segment patterns. Finally, the positions of the seeds are determined using a peak detection technique. Experiments with agar and turkey/chicken phantoms as well as patient data demonstrated that our needle segmentation technique could segment the needle in near real-time with an accuracy of 0.6 mm in position and 1.0 degrees in orientation. The true-positive rate for seed segmentation is 100% for the agar phantom and 93% for the chicken phantom. The average distance to manual seed segmentation was 1.0mm for the agar phantom and 1.7 mm for the chicken phantom.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Ding M,Wei Z,Gardi L,Downey DB,Fenster Adoi
10.1016/j.ultras.2006.07.003subject
Has Abstractpub_date
2006-12-22 00:00:00pages
e331-6eissn
0041-624Xissn
1874-9968pii
S0041-624X(06)00330-1journal_volume
44 Suppl 1pub_type
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