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For every treatment fraction, the agreement between the CBCT images and Calypso® guidance was optimal, with EMTs always within the defined tolerance (i.e., CT-Calypso or CBCT-Calypso measured differences in inter-EMT distances within 0.3 cm). Electromagnetic transponders to isocenter distances measured by Calypso® reproduced CT data and were confirmed on CBCTs. During RT, the EMTs centroid exceeded the threshold 24 times (20% of all fractions) 5 times in the left-right, 15 times in the anterior-posterior (AP), and 4 times in the superior-i