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Bone removal in CTA of the cervical arteries by piecewise matched mask bone elimination

Philips CT Clinical Science Philips Healthcare

van Straten M, Venema HW, Streekstra GJ, Majoie CB, den Heeten GJ, Grimbergen CA.


Department of Medical Physics, Academic Medical Center, Amsterdam, The Netherlands.


* Originally published in the October 2004 issue of Medical Physics.

In maximum intensity projection (MIP) images of CT angiography (CTA) scans, the arteries are often obscured by bone. A bone removal method is presented that uses an additional, non-enhanced scan to create a mask of the bone by thresholding and dilation. After registration of the CTA scan and the additional scan, the bone in the CTA scan is masked. As the cervical area contains bones that can move with respect to each other, these bones are separated first using a watershed algorithm, and then registered individually. A phantom study was performed to evaluate and quantify the tradeoff between the removal of the bone and the preservation of the arteries contiguous to the bone. The influence of algorithm parameters and scan parameters was studied. The method was clinically evaluated with data sets of 35 patients. Best results were obtained with a threshold of 150 HU and a dilation of 8 in-plane voxels and two out-of-plane voxels. The mean width of the soft tissue layer, which is also masked, was approximately 1 mm. The mAs value of the non-enhanced scan could be reduced from 250 mAs to 65 mAs without a loss of quality. In 32 cases, the bones were registered correctly and removed completely. In three cases, the bone separation was not completely successful, and consequently the bone was not completely removed. The piecewise matched mask bone elimination method proved to be able to obtain MIP images of the cervical arteries free from over-projecting bone in a fully automatic way and with only a slight increase of radiation dose.


For more information about this publication, check out the PubMed listing for this article.

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Mar 2, 2007

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bone removal, carotids, cervical spine, chest CTA, dose, MIP, Neck, neck CTA, Neuro, phantom, Vascular

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