TY - JOUR
T1 - Phantoms for IMRT dose distribution measurement and treatment verification
AU - Low, Daniel A.
AU - Gerber, Russell L.
AU - Mutic, Sasa
AU - Purdy, James A.
PY - 1998/3/15
Y1 - 1998/3/15
N2 - Background: The verification of intensity-modulated radiation therapy (IMRT) patient treatment dose distributions is currently based on custom- built or modified dose measurement phantoms. The only commercially available IMRT treatment planning and delivery system (Peacock, NOMOS Corp.) is supplied with a film phantom that allows accurate spatial localization of the dose distribution using radiography film. However, measurements using other dosimeters are necessary for the thorough verification of IMRT. Methods: We have developed a phantom to enable dose measurements using a cylindrical ionization chamber and the localization of prescription isodose curves using a matrix of thermoluminescent dosimetry (TLD) chips. The external phantom cross-section is identical to that of the commercial phantom, to allow direct comparisons of measurements. A supplementary phantom has been fabricated to verify the IMRT dose distributions for pelvis treatments. Results: To date, this phantom has been used for the verification of IMRT dose distributions for head and neck and prostate cancer treatments. Designs are also presented for a phantom insert to be used with polymerizing gels (e.g., BANG-2) to obtain volumetric dose distribution measurements. Conclusion: The phantoms have proven useful in the quantitative evaluation of IMRT treatments.
AB - Background: The verification of intensity-modulated radiation therapy (IMRT) patient treatment dose distributions is currently based on custom- built or modified dose measurement phantoms. The only commercially available IMRT treatment planning and delivery system (Peacock, NOMOS Corp.) is supplied with a film phantom that allows accurate spatial localization of the dose distribution using radiography film. However, measurements using other dosimeters are necessary for the thorough verification of IMRT. Methods: We have developed a phantom to enable dose measurements using a cylindrical ionization chamber and the localization of prescription isodose curves using a matrix of thermoluminescent dosimetry (TLD) chips. The external phantom cross-section is identical to that of the commercial phantom, to allow direct comparisons of measurements. A supplementary phantom has been fabricated to verify the IMRT dose distributions for pelvis treatments. Results: To date, this phantom has been used for the verification of IMRT dose distributions for head and neck and prostate cancer treatments. Designs are also presented for a phantom insert to be used with polymerizing gels (e.g., BANG-2) to obtain volumetric dose distribution measurements. Conclusion: The phantoms have proven useful in the quantitative evaluation of IMRT treatments.
KW - Intensity-modulated radiation therapy
KW - Inverse planning
KW - Radiation therapy dosimetry phantom
KW - Treatment verification
UR - http://www.scopus.com/inward/record.url?scp=0032520945&partnerID=8YFLogxK
U2 - 10.1016/S0360-3016(97)00910-3
DO - 10.1016/S0360-3016(97)00910-3
M3 - Article
C2 - 9539580
AN - SCOPUS:0032520945
SN - 0360-3016
VL - 40
SP - 1231
EP - 1235
JO - International Journal of Radiation Oncology Biology Physics
JF - International Journal of Radiation Oncology Biology Physics
IS - 5
ER -