(Sunday, 7/14/2019)
Room: ePoster Forums
Purpose: To evaluate suitability of SGRT for tracking patient’s position before and during radiation therapy, to aid in patient setup and treatment accuracy for various treatment sites
Methods: For breast treatments, the efficiency of AlignRT® in patient setup, and comparability with Elekta’s active breathing coordinator (ABC) system were investigated. For extremities, potential advantages of AlignRT® in patient setup accuracy and efficiency was evaluated which could reduce the need for re-imaging and re-adjusting the treatment site’s position. For cranial stereotactic radiosurgery (SRS) treatments, AlignRT® was evaluated against standard practice, BrainLab ExacTrac imaging, for couch angles of 0, 30, 60, 90, 330, 300 and 270 degrees.
Results: For head and neck cases, the observed discrepancy between imaging shift and the AlignRT positional shift was ± 6 mm with the average of 0.03 mm, 0.06 mm and 0.02 mm in vertical, longitudinal and lateral directions, respectively. For Breast/chest wall cases, the discrepancy was also within 6 mm, with the average of 1 mm, 0.05 mm and 0.6 mm in vertical, longitudinal and lateral directions, respectively. For the DIBH cases, the discrepancies of more than 3 mm were observed in noticeable number of cases, with the average of 1.3 mm, 0.3 mm and 0.6 mm in vertical, longitudinal and lateral directions, respectively. For the extremities, in some cases significant discrepancies were observed with up to 2 cm variations, with the average of 0.6 mm, 4.5 mm and 0.02 mm in vertical, longitudinal and lateral directions, respectively. These significant discrepancies can be attributed to the use of bolus and their poor visibility/detectability by the AlignRT system. For the SRS cases, the observed positional shift difference between AlignRT and ExacTrac was up to ± 0.8 mm/1° for different couch angles.
Conclusion: Despite presence of some limitations, AlignRT showed promising potential to be used for patient setup/monitoring.
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