Endoscopic resection can be recommended if a low-grade dysplastic lesion has at least one of the following risk factors: depressed morphology, surface erythema, or a size of 1 cm or greater. For lesions that have none of the three risk factors, follow-up endoscopy is recommended.
In intracavitary radiotherapy, incorrect source locations
can result in excessive doses to normal tissues. Therefore, it is
essential to accurately evaluate the source location. In this study,
we investigated a digital line dosimeter based on thallium (I)
bromide (TlBr) to improve the existing analogue verification
method. Therefore, a polycrystalline TlBr unit cell dosimeter was
manufactured, and the measurement performance of iridium-192
(Ir-192) sources was evaluated. We found that the dosimeter's
reproducibility satisfied the evaluation criteria of 1.5% with a
relative standard deviation of 1.44%. Moreover, the linearity
showed excellent results (linear coefficient, R
2 = 0.9999). The
distance dependence showed a difference of 0.03 cm at 50% intensity
when compared to the inverse square value, whereas the angular
dependence showed a large difference when compared to a diode. As
the angle increased, the intensity gradually decreased, resulting in
a difference of up to 41.9%. These results demonstrate the
excellent performance of the TlBr dosimeter. However, because of the
significant influence of angular dependence, a measurement distance
that minimises this error should be applied when manufacturing line
dosimeters in the future.
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