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Required Beam Data

Use the generic machine and energies that we supply: 4, 6, 10, 15, 16, 18, and 24 MV x-ray beams. The difference in most accelerators is due to the flattening filter. But the effects of the flattening filter are included in the beam field image that is measured, as well as the in air collimator scatter factor which is also being measured. The same applies for everything in the beam: wedges, collimator jaws, MLC. Dosimetry Check does not model the accelerator head. That is what is measured. If the percent depth dose is close for two machines of the same energy, phantom scatter is going to be close. Persons using generic data with various accelerators are getting good results. All you have to do is define what a monitor unit is on your system at a single point (specify the field size, SSD, depth, and dose rate in cGy/mu).

Just use it to test it. Compute a 10x10 cm field on your planning system for a water phantom and take a beam image of the 10x10 field. Run DosimetryCheck to compare dose distributions. Repeat for a small and large field size.

But if generic data is not satisfactory enough, we can convert, or are willing to attempt to convert, your existing beam data. The requirement is that you email us files that are in ASCII format. We cannot read binary files. On an as need basis we will write utilities to convert your data to our format. We may all ready have the utility for your existing system. We need central axis data, in air off center ratio on a diagonal, and in water off center ratio on a diagonal for your largest field size, and output factors. The program documentation gives more details. Dosimetry Check uses a pencil beam algorithm.

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