Fig. 6. Experimental configurat
An acrylic box filled with pure watethe ultrasound system. The tracking systhe phantom and the ultrasound probultrasound probe detected landmarks (Fphantom. After appropriate transformaticalculated during calibration, landmarkfiducial markers. The paired point regwas performed between a reconstructecomputed tomography (CT) volumephantom.
Two experiments were performed. depth mark, seven fiducial makers surface of the phantom were used Second, with one depth marker, seven attached to the surface of the phantomregistration. We measured the FRE anexperiment. TREs were measured usinthe inner landmarks, except the point tthe depth fiducial marker.
3. RESULTS
The registration accuracy withou
anatomical landmark was examined. Umarkers and additional one anatomicanumber of trials was 10 for each target.
tion.
er was used with stem tracked both be (Fig. 6). The Fig. 5) inside the ions, which were
ks were used like gistration method ed image of the e data and the
First, without a attached to the for registration. fiducial markers
m were used for nd TRE in every ng three points of that was used for
ut and with an Use seven surface al landmark. The
Fig. 7. Registration erroanatomical landmark
Fig. 7 shows the TREs and
with an anatomical landmark 2.13 ± 0.37 mm. Likewiseanatomical landmark, TRE1s 1.27 ± 0.39 mm, TRE2s were± 0.73 mm, TRE3s were 1.20.47 mm, TRE4s were 1.65 ±mm. Except TRE2, the use ocaused an increase in FRE, TRE.
4. CONCL
In this study, a point-baseincludes an anatomical landmusing an ultrasound systeregistration accuracy with anlandmark was examined. In twas confirmed that the targetimproved when the referenceerror caused by the distortioninsufficient calibration of thereduced, patient-image regaccurate.
ACKNOWLED
This work was supported development program (MOtorhinolaryngology, and invasive multi-DOF surgicaMinistry of Trade, Industry(10040097). It was also suppand Convergence Science DGIST.
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in part by a research and Medical Image- guided
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