Advances in fiducial‐free image‐guidance for spinal radiosurgery with CyberKnife – a phantom study

The image‐guided CyberKnife radiosurgery system is capable of tracking spinal targets without fiducial implants. Recently, a new version of this fiducial‐free image guidance modality (“enhanced Xsight spine tracking”) has been introduced. We assessed the accuracy of this novel technique versus its p...

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Vydané v:Journal of applied clinical medical physics Ročník 12; číslo 2; s. 20 - 28
Hlavní autori: Fürweger, Christoph, Drexler, Christian, Kufeld, Markus, Muacevic, Alexander, Wowra, Berndt
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States John Wiley & Sons, Inc 2011
John Wiley and Sons Inc
Predmet:
Accuracy
Algorithms
CyberKnife
Datasets
Equipment Design
fiducial‐free registration
Hardenberg, Georg Philipp Friedrich von (Novalis) (1772-1801)
Head and Neck Neoplasms - radiotherapy
Humans
image guidance
Image Processing, Computer-Assisted
Libraries
Phantoms, Imaging
Planning
Radiation Oncology Physics
Radiography
Radiosurgery - instrumentation
Radiosurgery - methods
Radiotherapy Planning, Computer-Assisted - methods
Reproducibility of Results
Robotics
spinal radiosurgery
Spine - diagnostic imaging
Spine - surgery
Surgery, Computer-Assisted - methods
Vertebrae
X-Rays
ISSN:1526-9914, 1526-9914
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Shrnutí:The image‐guided CyberKnife radiosurgery system is capable of tracking spinal targets without fiducial implants. Recently, a new version of this fiducial‐free image guidance modality (“enhanced Xsight spine tracking”) has been introduced. We assessed the accuracy of this novel technique versus its precursor in a comparative phantom study. The CyberKnife consists of a 6 MV linac on a six‐axis robot and a stereoscopic kV image guidance system. An anthropomorphic head‐and‐neck phantom with a cervical spine section was mounted on the linac nozzle. The robotic manipulator was used to precisely move the phantom to defined positions in the CyberKnife workspace. Multiple stereoscopic images were acquired at different translational and rotational positions. The enhanced Xsight spine tracking readouts were recorded and compared to the nominal phantom position. These tests were repeated with the original Xsight spine tracking version to analyze potential differences. Enhanced Xsight spine tracking correctly reported translational offsets with an RMS error of less than 0.4 mm. Yaw and roll rotations were detected with an accuracy of 0.2°, 0.25°. Pitch offsets were slightly underestimated, with up to 0.3° for an offset of ± 2°. Nominal X (left‐right) translational offsets were partially misinterpreted as roll (0.2° at a 10 mm offset). Apart from this, no correlation between rotational and translational directions was found. In comparison, the original Xsight spine tracking showed identical results for translations, but larger systematic and statistical errors for rotations. Enhanced Xsight spine tracking measurably improves precision in fiducial‐free spinal radiosurgery with the CyberKnife. PACS number: 87.53.Ly
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1526-9914
1526-9914
DOI:10.1120/jacmp.v12i2.3446