By Matej Možek; Danilo Vrtačnik; Drago Resnik; Borut Pečar; Slavko Amon; et al
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Extra resources for Adaptive calibration and quality control of smart sensors
Temporary implants using a stepping 192Ir HDR source to deliver large single-dose fractions has gained acceptance with current radiobiological models that predict a low [alpha]/[beta] ratio for prostate cancer, and 2. Permanent implantation, mainly with small radioactive seeds of 125I source with a half-life of 59 days is a second option. In some centers, the 121Pd is also used. The latter is not in the scope of this chapter. Breast: Two techniques for partial breast implant irradiation are in use: 1.
However, there are caveats in using such a procedure. We have found no practical interest so far in detecting, at the same time, a shift towards inadequate or adequate performance. It is one or the other that is of interest. If the performance monitored is assumed to be in control, then we are interested in detecting when it becomes inadequate and there is no need in detecting adequate performance only to continue the monitoring. If the performance is assumed to be out of control, such as for a trainee for instance (see below), there is no need for a test that indicates that the performance is indeed inadequate and we are only interested in knowing when it reaches a certain level of adequacy.
This type of approach may also help with a better understanding the concept of tolerance levels. 21 The Need for Quality Control in High Dose Rate Brachytherapy Item Material Frequency Point dose calculation Identify relevant dose points around the source for which a dose rate table is available, compare results, tolerance level is at ±2%, analyze in detail if deviations are > 5% Initially and with software updates Source selection Check that the system performs the source selection from the library properly Initially and with software updates Check dose distribution calculated by TPS Check dose distribution calculated by TPS of multiple source geometries Clinical benchmark cases shall be used Compare with previously selected clinical benchmark cases Initially and with software updates Initially and with software updates Shielding Check dose distribution of sources near the applicator shielding Initially and with software updates Table 5.
Adaptive calibration and quality control of smart sensors by Matej Možek; Danilo Vrtačnik; Drago Resnik; Borut Pečar; Slavko Amon; et al