![]() Based on our study, the Mobile AIRO CT system can be utilized accurately and reliably for image-guided proton therapy. The localization accuracy of AIRO was determined to be within 0.6° and 0.5 mm despite its slightly lower image quality overall compared to other CT imaging systems at our institution. Localization accuracy (based on Stereophan) demonstrated maximum AIRO-kV/kV shift differences of 0.1 mm in the x-direction, 0.1 mm in the y-direction, and 0.2 mm in the z-direction. ![]() Localization accuracy (based on the MIMI phantom) was 0.6° and 0.5 mm. The AIRO exhibited higher dose (>27 mGy) than the Philips CT Simulator. AIRO/Siemens and AIRO/Philips differences exceeded 100% for scaling discrepancy (191.2% and 145.8%). The AIRO spatial resolution was 0.21 lp mm -1 compared with 0.40 lp mm -1 for the Philips CT Simulator, 0.37 lp mm -1 for the Edge CBCT, and 0.35 lp mm -1 for the Siemens CT Simulator. For treatment delivery systems (Edge and Mevion), the localization accuracy of the 3D imaging systems were compared to 2D imaging systems on each system. Localization accuracy and CT Dose Index were measured and compared to reported values on each imaging device. Low CNR was acquired manually using the CTP515 module. Modulation transfer function, scaling discrepancy, geometric distortion, spatial resolution, overall uniformity, minimum uniformity, contrast, high CNR, and maximum HU deviation were acquired. DoseLAB software v.6.6 was utilized for image quality analysis. This is the first known application of the AIRO for proton therapy.įive CT images of a Catphan ® 504 phantom were acquired on the AIRO Mobile CT System, Varian EDGE radiosurgery system cone beam CT (CBCT), Philips Brilliance Big Bore 16 slice CT simulator, and Siemens SOMATOM Definition AS 20 slice CT simulator. Considering the clinical scenario of complex pedicle anatomy in spinal deformity AIRO ® navigation showed an excellent accuracy rate of 96.2%.ĪIRO® intraoperative CT Accuracy Complex spinal deformity Navigation Pedicle classification.The purpose of this study was to characterize the Mobius AIRO Mobile CT System for localization and image-guided proton therapy. This classification helps compare the accuracy of screw insertion in range of conditions by considering the complexity of screw insertion. After accounting for planned breach, the effective breach rate was 3.8% resulting in 96.2% accuracy for pedicle screw placement. Average screw insertion time was 1.76 ± 0.89 min. Among lateral breach (n = 16), ten screws were planned for in-out-in pedicle screw insertion. We noted 27 pedicle screw breach (medial: 10 lateral: 16 anterior: 1). We had 242 grade 2 pedicles, 133 grade 3, and 77 grade 4, and 44 pedicles were unfit for pedicle screw insertion. The average Cobb angle was 68.3° (range 60°-104°). Breach greater than 2 mm was considered for analysis.Ĥ52 pedicle screws were inserted (T1-T6: 116 T7-T12: 171 L1-S1: 165). Analysis was performed to estimate the accuracy of screw placement and time for screw insertion. Pedicles were classified according to complexity of insertion into five types. To develop a classification based on the technical complexity encountered during pedicle screw insertion and to evaluate the performance of AIRO ® CT navigation system based on this classification, in the clinical scenario of complex spinal deformity.ģ1 complex spinal deformity correction surgeries were prospectively analyzed for performance of AIRO ® mobile CT-based navigation system.
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