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Why did Sun Nuclear choose ionization chambers, not diodes, for the IC PROFILER? Can the IC PROFILER used for Linac commissioning? Why are some of the ionization chambers curved? I have a PROFILER or PROFILER 2, why would I need the IC PROFILER?
Q: Why did Sun Nuclear choose ionization chambers, not diodes, for the IC PROFILER?
A: Sun Nuclear produces both diodes and ionization chambers, and believes in utilizing the right detector for the right application. The intended applications for the IC PROFILER are Linac servicing and annual QA. These applications require TMR/PDD curve plotting and central axis output measurement for large fields, both of which are well suited for ionization chambers. Diodes offer significant benefits due to their small size, and diodes continue to be Sun Nuclear’s flagship detector; however small detector size was not required for this application.
Q: Can the IC PROFILER used for Linac commissioning?
A: Yes, but the IC PROFILER is not intended to be a complete replacement for a 3D water scanning system. The IC PROFILER can accelerate the commissioning process due to the fact that profiles are measured all at once, rather than by a single scanning detector. Additionally, a continuous line of detectors, as in the IC PROFILER, will measure the beam all at once and will reveal anomolies in beam output, whereas a scanning detector may miss these anomolies as it moves across a beam and only gives a brief view of the beam output at each profile location.
Q: Why are some of the ionization chambers curved?
A: The curved chamber design allows minimization of dose volume averaging and increases sensitivity.
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Q: I have a PROFILER or PROFILER 2, why would I need the IC PROFILER?
A: Operation of all PROFILER devices is similar. Compared to the PROFILER 2, the IC PROFILER offers diagonals, has a larger field size, and larger detectors. In many cases it will be a matter of preference, but generally the PROFILER 2 remains the gold standard for Linac QA and troubleshooting, and the IC PROFILER fills a need for Linac servicing and annual QA that may otherwise require a 1D or 3D tank.
