Fig. 1. Alignment Issue Caught by CBCT. In both the CBCT and the QACT, the alignment is to the fiducials and it can be observed that the bony anatomy is then very off. This resulted in an adaptive plan. This highlights the usefulness of CBCTs in identifying patient anatomical changes that can reduce the standard QACT rates, instead triggering a QACT if anatomical changes, such as this bony vs fiducial alignment difference, are observed on CBCTs.

Excessive quality assurance computed tomography scans can increase patient burden, resources, & #healthcare costs. Read a John Hopkins School of Medicine study evaluating the impact of standardized minimum #QACT frequencies across treatment sites - sciencedirect.com/science/arti... #MedPhys #Cancer

Fig. 1. Dosimetric Savings of 2 mm Plans. The dosimetric difference for each OAR clinical goal is shown for each patient.

In press now: Learn how a tailored #QACT schedule based on beam trajectory and target location reduces unnecessary imaging without compromising treatment accuracy in cranial #protontherapy : sciencedirect.com/science/arti... #particletherapy #radonc #MedPhys