TY - JOUR
T1 - Clinical application of a gantry-attachable plastic scintillating plate dosimetry system in pencil beam scanning proton therapy beam monitoring
AU - Jeong, Seonghoon
AU - Yoon, Myonggeun
AU - Chung, Kwangzoo
AU - Ahn, Sung Hwan
AU - Lee, Boram
AU - Seo, Jaehyeon
N1 - Funding Information:
This work was supported by the Basic Science Research Programs through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (NRF-2016R1D1A1B04932909).
Publisher Copyright:
© 2020 Associazione Italiana di Fisica Medica
PY - 2020/9
Y1 - 2020/9
N2 - Purpose: The entrance beam fluence of therapeutic proton scanning beams can be monitored using a gantry-attachable plastic scintillating plate (GAPSP). This study evaluated the clinical application of the GAPSP using a method that measures intensity modulated proton therapy (IMPT) beams for patient treatment. Methods: IMPT beams for the treatment of nine patients, at sites that included the spine, head and neck, pelvis, and lung, were measured using the GAPSP, composed of an EJ-212 plastic scintillator and a CMOS camera. All energy layers distinguished by the GAPSP were accumulated to determine the dose distribution of the treatment field. The evaluated fields were compared with reference dose maps verified by quality assurance. Results: Comparison of dose distributions of evaluation treatment fields with reference dose distributions showed that the 3%/1 mm average gamma passing rate was 96.4%, independent of the treatment site, energy range and field size. When dose distributions were evaluated using the same criteria for each energy layer, the average gamma passing rate was 91.7%. Conclusions: The GAPSP is a suitable, low-cost method for monitoring pencil beam scanning proton therapy, especially for non-spot scanning or additional collimation. The GAPSP can also estimate the treatment beam by the energy layer, a feature not common to other proton dosimetry tools.
AB - Purpose: The entrance beam fluence of therapeutic proton scanning beams can be monitored using a gantry-attachable plastic scintillating plate (GAPSP). This study evaluated the clinical application of the GAPSP using a method that measures intensity modulated proton therapy (IMPT) beams for patient treatment. Methods: IMPT beams for the treatment of nine patients, at sites that included the spine, head and neck, pelvis, and lung, were measured using the GAPSP, composed of an EJ-212 plastic scintillator and a CMOS camera. All energy layers distinguished by the GAPSP were accumulated to determine the dose distribution of the treatment field. The evaluated fields were compared with reference dose maps verified by quality assurance. Results: Comparison of dose distributions of evaluation treatment fields with reference dose distributions showed that the 3%/1 mm average gamma passing rate was 96.4%, independent of the treatment site, energy range and field size. When dose distributions were evaluated using the same criteria for each energy layer, the average gamma passing rate was 91.7%. Conclusions: The GAPSP is a suitable, low-cost method for monitoring pencil beam scanning proton therapy, especially for non-spot scanning or additional collimation. The GAPSP can also estimate the treatment beam by the energy layer, a feature not common to other proton dosimetry tools.
KW - Dose monitoring
KW - Pencil beam scanning proton therapy
KW - Plastic scintillating plate
KW - Treatment beam verification
UR - http://www.scopus.com/inward/record.url?scp=85089897808&partnerID=8YFLogxK
U2 - 10.1016/j.ejmp.2020.08.019
DO - 10.1016/j.ejmp.2020.08.019
M3 - Article
C2 - 32871459
AN - SCOPUS:85089897808
SN - 1120-1797
VL - 77
SP - 181
EP - 186
JO - Physica Medica
JF - Physica Medica
ER -