Dosimetric investigation of small fields in radiotherapy measurements using Monte Carlo simulations, CC04 ionization chamber, and razor diode
Published in Healthcare & Nursing, Bioengineering & Biotechnology, and Physics
Over the past few years, small-field dosimetry has advanced significantly, particularly with the rise of stereotactic and highly modulated treatments.
However, as field sizes approach the sub-centimeter regime, the agreement between measurement, TPS modeling, and Monte Carlo simulations can sometimes diverge in ways that are not purely detector-related.
Monte Carlo methods are often considered the gold standard in dose calculation. Yet in practice, several coupled factors influence the final agreement:
Beam source width and stability
Accelerator tuning and steering
MLC modeling and head scatter representation
Detector perturbation effects
Commissioning assumptions based on conventional field sizes
When segment sizes reach 1 cm or even 0.5 cm, very small variations in electron source width or beam alignment can lead to measurable output factor differences.
This suggests that the discussion may be shifting from “which detector is correct” toward how accurately the beam itself is represented in both measurement and modeling frameworks.
This raises the question of whether current protocols fully capture the sensitivity of these regimes.
I’m curious to hear perspectives from researchers and clinical physicists working in:
• small-field dosimetry
• Monte Carlo modeling
• beam commissioning and tuning
• SRS/VMAT physics
Are we mainly facing detector limitations — or are we beginning to observe the practical limits of current modeling approaches?
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Physical and Engineering Sciences in Medicine
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In my view, the next step is advancing Monte Carlo algorithms via the Boltzmann transport equation—especially for small field dosimetry.