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An Approach to Improve Accuracy of Optical Tracking Systems in Cranial Radiation Therapy.

Stüber P, Wagner B, Wissel T, Bruder R, Schweikard A, Ernst F - Cureus (2015)

Bottom Line: This work presents a new method for the accurate estimation of soft tissue thickness based on near infrared (NIR) laser measurements.By using this estimation, our goal is to develop an improved non-invasive marker-less optical tracking system for cranial radiation therapy.Results are presented for three subjects and reveal an RMS error of less than 0.34 mm.

View Article: PubMed Central - HTML - PubMed

Affiliation: University of Lübeck, Institute for Robotics and Cognitive Systems.

ABSTRACT
This work presents a new method for the accurate estimation of soft tissue thickness based on near infrared (NIR) laser measurements. By using this estimation, our goal is to develop an improved non-invasive marker-less optical tracking system for cranial radiation therapy. Results are presented for three subjects and reveal an RMS error of less than 0.34 mm.

No MeSH data available.


Related in: MedlinePlus

Marker geometry utilized for the matching of MRI and NIR scans
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FIG2: Marker geometry utilized for the matching of MRI and NIR scans

Mentions: To guarantee the most reliable matching of MRI data and NIR scans, we used a customized marker (Figure 2) which can be detected in the MRI scans. Furthermore, this marker can also be detected by the accuTrack 250 optical tracking system (atracsys, Le Mont-sur-Lausanne, Switzerland). A dental cast fixed the marker in a reproducible position in relation to the subject’s forehead. An additional CT scan of the marker geometry was acquired, and the marker spheres were extracted from the CT and MRI scan. This is necessary to establish a relation between MRI and NIR scans. By tracking the marker during the optical measurement, the pre-alignment between the NIR and the MRI scan was achieved. Afterwards, the alignment between both scans was refined by using the Iterative Closest Point (ICP) algorithm [5].


An Approach to Improve Accuracy of Optical Tracking Systems in Cranial Radiation Therapy.

Stüber P, Wagner B, Wissel T, Bruder R, Schweikard A, Ernst F - Cureus (2015)

Marker geometry utilized for the matching of MRI and NIR scans
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494531&req=5

FIG2: Marker geometry utilized for the matching of MRI and NIR scans
Mentions: To guarantee the most reliable matching of MRI data and NIR scans, we used a customized marker (Figure 2) which can be detected in the MRI scans. Furthermore, this marker can also be detected by the accuTrack 250 optical tracking system (atracsys, Le Mont-sur-Lausanne, Switzerland). A dental cast fixed the marker in a reproducible position in relation to the subject’s forehead. An additional CT scan of the marker geometry was acquired, and the marker spheres were extracted from the CT and MRI scan. This is necessary to establish a relation between MRI and NIR scans. By tracking the marker during the optical measurement, the pre-alignment between the NIR and the MRI scan was achieved. Afterwards, the alignment between both scans was refined by using the Iterative Closest Point (ICP) algorithm [5].

Bottom Line: This work presents a new method for the accurate estimation of soft tissue thickness based on near infrared (NIR) laser measurements.By using this estimation, our goal is to develop an improved non-invasive marker-less optical tracking system for cranial radiation therapy.Results are presented for three subjects and reveal an RMS error of less than 0.34 mm.

View Article: PubMed Central - HTML - PubMed

Affiliation: University of Lübeck, Institute for Robotics and Cognitive Systems.

ABSTRACT
This work presents a new method for the accurate estimation of soft tissue thickness based on near infrared (NIR) laser measurements. By using this estimation, our goal is to develop an improved non-invasive marker-less optical tracking system for cranial radiation therapy. Results are presented for three subjects and reveal an RMS error of less than 0.34 mm.

No MeSH data available.


Related in: MedlinePlus