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Figure 11. Differences between calculated and measured doses for national trial phantoms. (a) The START trial phantom [29], showing results for reference, lung, medial and apex points. A positive difference indicates that Pinnacle3 predicts a higher dose than is actually measured. Position relative to the central slice increases superiorly. (b) The RT-01 trial phantom. The error bars represent the maximum and minimum doses calculated by Pinnacle3 within a region of radius 4 mm around the point of interest, indicating the possible influence of positioning errors on the results, particularly in the penumbra, e.g. points CRECT and IRPTV. The first letter of each abbreviation represents the superior/inferior position: SBLAD, superior bladder; SRPTV, superior right PTV; SRECT, superior rectum; SSVL, superior seminal vesicles; CREF, central reference point; CBLAD, central bladder; CRPTV, central right PTV; CLPTV, central left PTV; CRECT, central rectum; CFMLT, central left femoral head; IAPEX, inferior apex of prostate; IRPTV, inferior right PTV; IRECT, inferior rectum.
