634 research outputs found
Prediction-based compensation for gate on/off latency during respiratory-gated radiotherapy
During respiratory-gated radiotherapy (RGRT), gate on and off latencies cause
deviations of gating windows, possibly leading to delivery of low- and
high-dose radiations to tumors and normal tissues, respectively. Currently,
there are no RGRT systems that have definite tools to compensate for the
delays. To address the problem, we propose a framework consisting of two steps:
1) multi-step-ahead prediction and 2) prediction-based gating. For each step,
we have devised a specific algorithm to accomplish the task. Numerical
experiments were performed using respiratory signals of a phantom and ten
volunteers, and our prediction-based RGRT system exhibited superior performance
in more than a few signal samples. In some, however, signal prediction and
prediction-based gating did not work well, maybe due to signal irregularity
and/or baseline drift. The proposed approach has potential applicability in
RGRT, and further studies are needed to verify and refine the constituent
algorithms.Comment: 12 pages, 12 figures, accepted by Computational and Mathematical
Methods in Medicin
Recovery of Tsunami-Affected Paddy Soil Using Calcium Materials for Sustainable Agriculture
Symposium paper Part 2: Frontiers of sustainable rice production syste
Formulation of objective indices to quantify machine failure risk analysis for interruptions in radiotherapy
Objectives: To evaluate the effect of interruption in radiotherapy due to machine failure in patients and medical institutions using machine failure risk analysis (MFRA).
Material and methods: The risk of machine failure during treatment is assigned to three scores (biological effect, B; occurrence, O; and cost of labor and repair parts, C) for each type of machine failure. The biological patient risk (BPR) and the economic institution risk (EIR) are calculated as the product of B and O (B×O) and C and O (C×O), respectively. The MFRA is performed in two linear accelerators (linacs).
Result: The multileaf collimator (MLC) fault has the highest BPR and second highest EIR. In particular, TrueBeam has a higher BPR and EIR for MLC failures. The total EIR in TrueBeam was significantly higher than that in Clinac iX. The minor interlock had the second highest BPR, whereas a smaller EIR. Meanwhile, the EIR for the LaserGuard fault was the highest, and that for the monitor chamber fault was the second highest. These machine failures occurred in TrueBeam. The BPR and EIR should be evaluated for each linac. Further, the sensitivity of the BPR, it decreased with higher T1=2 and α/β values. No relative difference is observed in the BPR for each machine failure when T1=2 and α/β were varied.
Conclusion: The risk faced by patients and institutions in machine failure may be reduced using MFRA.
Advances in knowledge: For clinical radiotherapy, interruption can occur from unscheduled downtime with machine failures. Interruption causes sublethal damage repair. The current study evaluated the effect of interruption in radiotherapy owing to machine failure on patients and medical institutions using a new method, that is, machine failure risk analysis
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