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KMID : 1164220210330010063
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Journal of Korean Society for Radiotherapeutic Technology
2021 Volume.33 No. 1 p.63 ~ p.69
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Comparative analysis of Intra Fractional Motion Between Continuous Positive Airway Pressure and Abdominal Compressor for Lung Stereotactic Body Radiation Therapy
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Cho Min-Jun
Yoo Hyun-Jong
Cho Kang-Chul
Park Hyo-Kuk
Yoon Jong-Won
Cho Jung-Hee
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Abstract
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Purpose: When applying continuous positive airway pressure (CPAP) and abdominal compressor (AC) to independent specimens in stereotactic body radiation therapy in lung cancer patients, the value of how much the target's position changed during treatment. By analyzing the target movement, we aimed to select a more useful device for minimizing the movement of the target.
Materials and Methods: We retrospectively analyzed 26 patients with two treatment arcs among patients with CPAP and AC in stereotactic body radiotherapy for lung cancer. Images were acquired using CBCT during treatment (2nd arc), and intra-fractional motion (IFM) was compared and analyzed.
Result: Welch's t-test was performed with 102 observations integrating three directions, and it was confirmed that the mean difference in IFM between CPAP and AC was not significantly significant (p→0.05). When the translation (x, y, z) shift value in CPAP during treatment (2nd arc) and the translation (x, y, z) shift value in AC were confirmed as a distribution in 3D space, in the case of AC, intensively near the center point. While it can be confirmed that they are distributed, in the case of CPAP, outlier values can be observed to be distributed outside. In the three directional integrated comparative analysis, the mean, standard deviation, and maximum error values in CPAP were 0.13±0.15 cm and 0.70 cm, and in AC, the mean, standard deviation, and maximum error values were 0.11±0.10 cm and 0.50 cm. In CPAP, outliers of 0.7 cm, 0.5 cm, -0.5 cm, -0.6 cm, and -0.7 cm were seen, whereas in AC, there were 0.5 cm outliers.
Conclusion: In terms of IFM, AC had fewer random errors than CPAP. However, both CPAP and AC have their own advantages, disadvantages, and indications, and since the average difference in IFM between CPAP and AC is not significant, it is possible to increase the efficiency of treatment by applying a device suitable for the clinical situation to the patient.
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KEYWORD
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SBRT, Intra Fractional Motion, Continuous Positive Airway Pressure, Abdominal compressor
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