“Carbon ion radiotherapy using fiducial markers for prostate cancer in Osaka HIMAK: Treatment planning”
Extract from abstract: Purpose: Carbon ion radiotherapy for prostate cancer was performed using two fine needle Gold Anchor (GA) markers for patient position verification in Osaka Heavy Ion Medical Accelerator in Kansai (Osaka HIMAK). The present study examined treatment plans for prostate cases using beam-specific planning target volume (bsPTV) based on the effect of the markers on dose distribution and analysis of target movements.
Materials and Methods: Gafchromic EBT3 film was used to measure dose perturbations caused by markers. …To derive the effect of markers, two types of markers, including GA, were placed at the proximal, center, and distal depths within the same spread-out Bragg peak (SOBP), and dose distributions behind the markers were measured using the films.
Results: …The dose perturbation close behind the markers was smallest (<10% among depths within the SOBP regardless of types of markers) and increased with depth. The effect of two types of GAs on dose distributions was small and could be ignored in the treatment planning.
Article from The Journal of Applied Clinical Medical Physics, 2021