Accuracy of proton beam range verification using post-treatment positron emission tomography/computed tomography as function of treatment site

International Journal of Radiation Oncology, Biology, Physics
Antje-Christin KnopfHelen A Shih

Abstract

For 23 patients, an off-line positron emission tomography scan and a computed tomography scan after proton radiotherapy was performed at the Massachusetts General Hospital to assess in vivo treatment verification. A well-balanced population of patients was investigated to assess the effect of the tumor location on the accuracy of the technique. Range verification was achieved by comparing the measured positron emission tomography activity distributions with the corresponding Monte Carlo-simulated distributions. Observed differences in the distal end of the activity distributions were analyzed as potential indicators for the range differences between the actual delivered and planned dose. The average spatial agreement between the measured and simulated activity distribution was within ±3 mm, and the corresponding average absolute agreement was within ±45% (derived from gamma index analysis). The mean absolute range deviation at 93 randomly chosen positions in 17 treatment fields delivered to 11 patients was 3.6 mm. Characteristic differences in the agreement of the measured and simulated activity distribution for the different tumor/target sites were found. This resulted from the different effect of factors such as biologic wash...Continue Reading

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Citations

Feb 20, 2013·Radiological Physics and Technology·Shinichiro MoriAntje-Christin Knopf
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