KODAK EDR2 Film
Extended Dose Range (EDR) READY-PACK Film for Monitoring and Evaluation of Exposures at Therapy Energies
KODAK EDR2 film is the latest addition to our award-winning products designed specifically for oncology applications. Compared to most x-ray films, it is relatively insensitive to x-ray energies and, hence, has a response which extends to very high exposures. Intended for direct exposure applications, EDR2 film extends the current line of KODAK Ready-Pack products which includes PPL, and *XV films. It is not suitable for portal imaging radiographs.
* No longer available in the United States.
Film is a convenient means for calibration and monitoring of exposures.
- Large area
- Low cost, widely available
- Excellent for relative dosimetry (e.g., field uniformity, equipment characterization: field shapes, port openings, MLCs)
- With appropriate calibration, film may be applicable to absolute dosimetry (e.g., high-dose treatment strategies such as IMRT)
Features of EDR2 direct exposure applications
- Wide response range
- Approximately linear
- Robust processing
KODAK EDR2 Film - Dose Response for Evaluation
Exact dose responses are a function of facility dependent factors including processing conditions (processing time, processing temperature, processing equipment, processing chemistry), the density sampling (digitizer equipment and calibration), and exposure monitoring equipment. The exact response relationship should be measured and verified for the local conditions. The films should be processed using recommendations found in Service Bulletin #30.
Measurement Technique
The dose response of a film should be measured using appropriate amounts of build-up and backscatter material. Many references have discussed methodology for measuring the response of a film. A few of these are:
- M. D. C. Evans and L. J. Schreiner, "A simple technique for film dosimetry," Radiother. Oncol. Vol 23, pages 265–267, 1992.
- J. I. Hale, A. T. Kerr, and P. C. Shragge, "Calibration of film for accurate megavoltage photon dosimetry," Med. Dosimetry Vol 19, pages 43–46, 1994.
- Inhwan J. Yeo, C-K Chris Wang, and Sandra E. Burch, "A filtration method for improving film dosimetry in photon radiation therapy," Medical Physics Vol 24, pages 1943–1953, December 1997.
- J. L. Robar and B. G. Clark, "The use of radiographic film for linear accelerator stereotactic radiosurgical dosimetry," Medical Physics Vol 26, pages 2144–2150, 1999.
KODAK EDR2 Other READY-PACK Films
The selection of the appropriate film depends on the application and the exposure range of interest.
The table below summarizes the approximate active ranges and saturation points for KODAK Ready-Pack films commonly used in radiation therapy departments. This information may be helpful when considering their use in various applications, including relative and absolute dosimetric measurements:
|
Film
|
Responsive Range
|
Approximate
Saturation Exposure
|
|
PPL
|
0.25–5 cGy
|
10 cGy
|
|
*XV-2
|
5–100 cGy
|
200 cGy
|
|
EDR2
|
25–400 cGy
|
700 cGy
|
* No longer available in the United States.
KODAK EDR2 film comes in two different sizes:
- Product size: 10 x 12 in
CAT No. 809 7214
- Product size: 35 x 43 cm
CAT No. 116 1769