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An assessment of clinically optimal gold marker length and diameter for pelvic radiotherapy verification using an amorphous silicon flat panel electronic portal imaging device

¹ Academic Department of Radiation Oncology, University of Manchester, ² Department of Medical Statistics and ³ Northwest Medical Physics, Christie Hospital NHS Trust, Wilmslow Road, Manchester M20 4BX, UK

View larger version (52K): [in a new window]   Figure 1. Three templates each with randomly placed 0.9 mm, 1.0 mm, and 1.1 mm diameter markers, respectively.

View larger version (26K): [in a new window]   Figure 2. Successful visualization (%) in anterior-posterior (AP) electronic portal images (EPIs) for each of the seven marker sizes. Error bars indicate ± 2 SD. Results are from EPIs acquired with markers on either the entry or exit site of the treatment beam.

View larger version (24K): [in a new window]   Figure 3. Successful visualization (%) in lateral electronic portal images (EPIs) for each of the seven marker sizes. Error bars indicate ± 2 SD. Results are from EPIs acquired with markers on either the entry or exit site of the treatment beam.