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Figure 1 | Radiation Oncology

Figure 1

From: Intra- and inter-radiation therapist reproducibility of daily isocenter verification using prostatic fiducial markers

Figure 1

Illustration of software interface for manual matching of fiducial markers. Panels A and C show portal images (anterior-posterior (AP) and left lateral (LLat) respectively, red MLC profile) with a superimposed diagram representing the treatment planning MLC (blue profile) relative to fiducial markers locations (yellow outline). The therapist has manually aligned the yellow marker outlines in the treatment planning diagram to the radiopaque markers in the portal image. Panels B and D (corresponding to panels A and C, respectively), represent the magnitude of couch movement required for a match (arrow). Using a threshold of 5 mm, a longitudinal shift (inferiorly) of 9 mm was required.

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