Hospital Universitari Sant Joan de Reus, Servicio de Física Médica, Reus (Tarragona), Spain.
Hospital IMED, Servicio de Oncología Radioterápica, Elche (Alicante), Spain.
Phys Med. 2016 Sep;32(9):1167-74. doi: 10.1016/j.ejmp.2016.08.019. Epub 2016 Aug 29.
To study how noise and scanner response variability affect radiochromic film dosimetry.
Five treatment plans were analyzed in this work with two different multichannel protocols: the multichannel algorithm of Mayer et al. and the efficient protocol of Lewis et al.
The multichannel protocol of Mayer et al. is not able to compensate variability in scanner response, which is an important issue for radiochromic film dosimetry. The efficient protocol compensates variations of scanner response, so dose values and gamma scores become more accurate and reproducible. The compensation of digitizer scan variability of the efficient protocol, together with time averaging improve radiochromic film dosimetry. Noise is related to selected resolution in the scanner, our results show that if high resolution measurements are required, de-noising should be considered.
研究噪声和扫描仪响应变化如何影响光致变色胶片剂量测定。
本研究分析了 5 种治疗计划，采用了两种不同的多通道方案：Mayer 等人的多通道算法和 Lewis 等人的高效方案。
Mayer 等人的多通道方案不能补偿扫描仪响应的变化，这是光致变色胶片剂量测定中的一个重要问题。高效方案补偿了扫描仪响应的变化，因此剂量值和伽马评分变得更加准确和可重复。高效方案补偿了数字化仪扫描变化，以及时间平均化提高了光致变色胶片剂量测定的准确性。噪声与扫描仪中选择的分辨率有关，我们的结果表明，如果需要进行高分辨率测量，则应考虑去噪。
