Linguistic Approach to Support Human Reliability Analysis and Validation Work in Advanced Radiotherapy Technologies

Giardina, Mariarosa; Buffa, Pietro; Cirrone, G.A.P.; Raffaele, L.; Salamone, Vincenzo

doi:10.1007/978-3-030-20037-4_23

Cited by 2 publications

(4 citation statements)

References 17 publications

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“…Numerical values of risk parameters O, D, S and of RPN index are converted into linguistic variables to which labels of fuzzy sets are associated. For example, let us parameter O relating to occurrence probability of a failure mode, its values in the range [1][2][3][4][5][6][7][8][9][10] is interpreted by using fuzzy labels such as "low", "medium", "high", etc. This approach greatly facilitated the expert's judgments in identifying critical aspects of the task under consideration.…”

Section: Comparison With Other Fmeca Analysis Strategiesmentioning

confidence: 99%

“…In this context, a recent collaboration between the Engineering Department (ED) of the University of Palermo and the Radiotherapy Department (RD) of ARNAS Civico has allowed to develop a new tool, called SAPERO (Patient Safety: advanced techniques and for the assessment of the risk of unwanted events within the care pathway in the Radiotherapy sector). It integrates the application of the following techniques: Hierarchical Task Analysis (HTA) [1], Cognitive Task Analysis (CTA) [2,3], Human Error Assessment and Reduction Technique (HEART) [4][5][6] and Fuzzy Failure Mode Effects and Criticality Analysis (FFMECA) [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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SAPERO: a new tool for safety analyses in advanced radiotherapy

Giardina,

Tomarchio,

Buffa

et al. 2023

Eur. Phys. J. Plus

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Improving safety standards in advanced radiotherapy technologies, where historical experience is not sufficient due to innovation aspects, raises the need to perform studies using new tools that follow a holistic view of the process chain. Such studies are useful to identify additional critical elements compared to safety analyses carried out by classic tools. In this field, SAPERO (La SicurezzA del PazientE: tecniche avanzate ed innovative per la valutazione del rischio di eventi indesiderati all'interno del percorso assistenziale nel settore RadioterapicO) is a new assessment tool that allows to use integrated of Hierarchical Task Analysis (HTA); Failure Mode Effects and Criticality Analysis (FMECA); Cognitive Task Analysis (CTA); Human Error Assessment Reduction Technique (HEART). The methodological approaches have been suitably modified to address their operating in the medical sector under study. Some improvements have concerned the application of the fuzzy theory in FMECA and the use of a linguistic approach in HEART. In this paper, SAPERO application on a case study related to treatment procedures in helical tomotherapy performed at the radiotherapy department of ARNAS Civico hospital, Italy, is described. The results have allowed to provide suggestions aimed to improve the examined process.

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Section: Comparison With Other Fmeca Analysis Strategiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SAPERO: a new tool for safety analyses in advanced radiotherapy

Giardina,

Tomarchio,

Buffa

et al. 2023

Eur. Phys. J. Plus

Self Cite

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show abstract

“…Linguistic values can characterize complex phenomena or ill‐defined phenomena, which cannot be adequately characterized in numerical ways 10,19,20 . Real‐world case studies also indicate that experts are more comfortable characterizing the reliability of a system qualitatively rather than quantitatively when the available quantitative data are inadequate, improper and inaccurate for statistical evaluation 11,21–23 . For example, it is more common or easier for experts to say that “there is a low possibility for component A to fail ” rather than “the failure probability of component A is 1.5E‐7 .”…”

Section: Theorymentioning

confidence: 99%

“…10,19,20 Real-world case studies also indicate that experts are more comfortable characterizing the reliability of a system qualitatively rather than quantitatively when the available quantitative data are inadequate, improper and inaccurate for statistical evaluation. 11,[21][22][23] For example, it is more common or easier for experts to say that "there is a low possibility for component A to fail" rather than "the failure probability of component A is 1.5E-7." System or component failure possibilities could be graded based on two types of justification, that is, component types or failure occurrence likelihoods.…”

Section: Failure Possibility Distributionmentioning

confidence: 99%

Fuzzy probability and α‐cut based‐fault tree analysis approach to evaluate the reliability and safety of complex engineering systems

Purba

Tjahyani

Susila

et al. 2022

Quality & Reliability Eng

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Reliability and safety are very critical in complex engineering systems such as chemical and nuclear industries. Fault tree analysis (FTA) has been widely applied to evaluate the reliability and safety of complex engineering systems. This approach assumes that systems always have exact component failure probabilities. However, this assumption is not always true in real‐world applications. To deal with this, a number of scholars have integrated fuzzy approach into FTA of engineering systems whose component exact probabilities cannot be collected. Furthermore, simple fuzzy arithmetic operations on membership function have also been proposed to quantify Boolean gates for propagating uncertainties from basic event fuzzy probabilities into the top event fuzzy probabilities. In this study, fuzzy arithmetic operations on α‐cuts, as opposed to simple fuzzy arithmetic operations, are proposed. The significance of the α‐cut is that each α‐cut can uniquely represents each fuzzy probability. In order to verify the applicability of the proposed approach, the reliability of the long‐term cooling system of the Westinghouse AP1000 to mitigate a large break loss of coolant accident is evaluated and the results are compared to the reliability of the same system quantified by conventional FTA published in qualified scientific journals. The results of the benchmarking confirm that the proposed approach can be practicably implemented to estimate the reliability and safety of complex engineering systems whose basic event reliability are characterized by fuzzy probabilities. To be applied in other complex engineering systems, safety analysts have to concern for some steps, which are particularly developed for a specific application, such as failure possibility distribution and its corresponding fuzzy probability distribution and the selection of a defuzzification technique.

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Linguistic Approach to Support Human Reliability Analysis and Validation Work in Advanced Radiotherapy Technologies

Cited by 2 publications

References 17 publications

SAPERO: a new tool for safety analyses in advanced radiotherapy

SAPERO: a new tool for safety analyses in advanced radiotherapy

Fuzzy probability and α‐cut based‐fault tree analysis approach to evaluate the reliability and safety of complex engineering systems

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