Int J Comput Assist Radiol Surg - Video-guided calibration of an augmented reality mobile C-arm.

Tópicos

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Resumo

RPOSE: The augmented reality (AR) fluoroscope augments an X-ray image by video and provides the surgeon with a real-time in situ overlay of the anatomy. The overlay alignment is crucial for diagnostic and intra-operative guidance, so precise calibration of the AR fluoroscope is required. The first and most complex step of the calibration procedure is the determination of the X-ray source position. Currently, this is achieved using a biplane phantom with movable metallic rings on its top layer and fixed X-ray opaque markers on its bottom layer. The metallic rings must be moved to positions where at least two pairs of rings and markers are isocentric in the X-ray image. The current "trial and error" calibration process currently requires acquisition of many X-ray images, a task that is both time consuming and radiation intensive. An improved process was developed and tested for C-arm calibration.METHODS: Video guidance was used to drive the calibration procedure to minimize both X-ray exposure and the time involved. For this, a homography between X-ray and video images is estimated. This homography is valid for the plane at which the metallic rings are positioned and is employed to guide the calibration procedure. Eight users having varying calibration experience (i.e., 2 experts, 2 semi-experts, 4 novices) were asked to participate in the evaluation.RESULTS: The video-guided technique reduced the number of intra-operative X-ray calibration images by 89?% and decreased the total time required by 59?%.CONCLUSION: A video-based C-arm calibration method has been developed that improves the usability of the AR fluoroscope with a friendlier interface, reduced calibration time and clinically acceptable radiation doses.

Resumo Limpo

rpose augment realiti ar fluoroscop augment xray imag video provid surgeon realtim situ overlay anatomi overlay align crucial diagnost intraop guidanc precis calibr ar fluoroscop requir first complex step calibr procedur determin xray sourc posit current achiev use biplan phantom movabl metal ring top layer fix xray opaqu marker bottom layer metal ring must move posit least two pair ring marker isocentr xray imag current trial error calibr process current requir acquisit mani xray imag task time consum radiat intens improv process develop test carm calibrationmethod video guidanc use drive calibr procedur minim xray exposur time involv homographi xray video imag estim homographi valid plane metal ring posit employ guid calibr procedur eight user vari calibr experi ie expert semiexpert novic ask particip evaluationresult videoguid techniqu reduc number intraop xray calibr imag decreas total time requir conclus videobas carm calibr method develop improv usabl ar fluoroscop friendlier interfac reduc calibr time clinic accept radiat dose

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