Int J Comput Assist Radiol Surg - Ultrasound-CT registration of vertebrae without reconstruction.

Tópicos

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Resumo

RPOSE: 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.

Resumo Limpo

rpose robust accur previous develop volumetovolum ultrasoundct registr vertebra requir d ultrasound slice reconstruct d volum timeconsum step increas total registr time per vertebra modifi registr techniqu slicestovolum strategi elimin ultrasound reconstruct step order make total registr time practic intraoperativelymethod slicestovolum registr achiev perform backward scan line trace individu ultrasound slice acquir regist group posterior vertebr surfac extract preoper ct imag techniqu valid use lumbosacr sawbon phantom lumbosacr section three porcin cadaversresult slicestovolum registr reduc total registr time per vertebra min registr accuraci robust slicestovolum registr found equal superior previous volumetovolum registr addit tradeoff found registr accuraci registr speed chang number ultrasound slice use registrationconclus slicestovolum ultrasoundct registr signific reduc total registr time per vertebra make autom techniqu practic intraop

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