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Volume 18, Number 4, 2013

A calibration method for patient specific IMRT QA using a single therapy verification film

Arvind Kumar Shukla, Arun S. Oinam, Sanjeev Kumar, I.S. Sandhu,
S.C. Sharma


Aim: The aim of the present study is to develop and verify the single film calibration procedure
used in intensity-modulated radiation therapy (IMRT) quality assurance.
Background: Radiographic films have been regularly used in routine commissioning of
treatment modalities and verification of treatment planning system (TPS). The radiation
dosimetery based on radiographic films has ability to give absolute two-dimension dose distribution
and prefer for the IMRT quality assurance. However, the single therapy verification
film gives a quick and significant reliable method for IMRT verification.
Materials and methods: A single extended dose rate (EDR 2) film was used to generate the
sensitometric curve of film optical density and radiation dose. EDR 2 film was exposed with
nine 6 cm × 6 cm fields of 6 MV photon beam obtained from a medical linear accelerator
at 5-cm depth in solid water phantom. The nine regions of single film were exposed with
radiation doses raging from 10 to 362 cGy. The actual dose measurements inside the field
regions were performed using 0.6 cm3 ionization chamber. The exposed film was processed
after irradiation using a VIDAR film scanner and the value of optical density was noted for
each region. Ten IMRT plans of head and neck carcinoma were used for verification using a
dynamic IMRT technique, and evaluated using the gamma index method with TPS calculated
dose distribution.
Results: Sensitometric curve has been generated using a single film exposed at nine field
region to check quantitative dose verifications of IMRT treatments. The radiation scattered
factor was observed to decrease exponentially with the increase in the distance from the
centre of each field region. The IMRT plans based on calibration curve were verified using
the gamma index method and found to be within acceptable criteria.
Conclusion: The single film method proved to be superior to the traditional calibration method
and produce fast daily film calibration for highly accurate IMRT verification.

Signature: Rep Pract Oncol Radiother, 2013; 18(4) : 235-240

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