Ultrasound-CT registration of vertebrae without reconstruction

Purpose While robust and accurate, our previously developed volume-to-volume ultrasound-CT registration of vertebrae required that the 2D ultrasound slices be reconstructed into a 3D volume, a time-consuming step that increased the total registration time per vertebra. We have modified our registrat...

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Bibliographic Details
Published in:International journal for computer assisted radiology and surgery 2012-11, Vol.7 (6), p.901-909
Main Authors: Yan, Charles X. B., Goulet, Benoît, Tampieri, Donatella, Collins, D. Louis
Format: Article
Language:English
Subjects:
Animals
Cadaver
Computer Imaging
Computer Science
Health Informatics
Imaging
Imaging, Three-Dimensional
Medicine
Medicine & Public Health
Original Article
Pattern Recognition and Graphics
Phantoms, Imaging
Radiology
Spine - diagnostic imaging
Spine - surgery
Statistics, Nonparametric
Surgery
Swine
Tomography, X-Ray Computed - methods
Ultrasonography - methods
Vision
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Summary:Purpose While robust and accurate, our previously developed volume-to-volume ultrasound-CT registration of vertebrae required that the 2D ultrasound slices be reconstructed into a 3D volume, a time-consuming step that increased the total registration time per vertebra. We have modified our registration technique to a slices-to-volume strategy to eliminate the ultrasound reconstruction step in order to make the total registration time more practical intraoperatively. Methods The slices-to-volume registration is achieved by performing backward scan line tracing on individual ultrasound slices as they are acquired, and then registering them as a group to the posterior vertebral surface extracted from the pre-operative CT image. The technique is validated using a lumbosacral Sawbones phantom and the lumbosacral section of three porcine cadavers. Results The slices-to-volume registration reduced the total registration time per vertebra from 8 to 4 min. The registration accuracy and robustness of the slices-to-volume registration were found to be equal or superior to those of our previous volume-to-volume registration. In addition, a trade-off was found between registration accuracy and registration speed by changing the number of ultrasound slices used in the registration. Conclusions The slices-to-volume ultrasound-CT registration significantly reduces the total registration time per vertebra, making this automated technique more practical intraoperatively.
ISSN:1861-6410
1861-6429
DOI:10.1007/s11548-012-0771-9