Resumo

VAN ROOYEN, Marthinus B.  e  PITCHER, Richard D.. The Cinderellas of the scanner: Magnetic resonance imaging 'pre-scan' and 'post-scan' times: Their determinants and impact on patient throughput. S. Afr. J. radiol. (Online) [online]. 2020, vol.24, n.1, pp.1-6. ISSN 2078-6778.  http://dx.doi.org/10.4102/sajr.v24i1.1946.

BACKGROUND: Increasing demand for magnetic resonance imaging (MRI) has contributed to extended patient waiting times worldwide. This is particularly true in resource-limited environments, prompting this institutional workflow analysis. OBJECTIVE: To determine the 'pre-' and 'post-scan' times for normal-hour MRI studies conducted at a tertiary-level, public-sector South African hospital and to assess any association with demographic details, patient characteristics, anatomical site and scan parameters. A secondary objective was determination of the average daily MR 'down' time. METHODS: A prospective descriptive study stratifying MRI workflow into 'pre-scan', 'scan', 'post-scan' and 'down' times. During 'pre-' and 'post-scan' times patients occupied the scanner whilst staff performed tasks indirectly contributing to image acquisition. During 'down' time no patient occupied the MRI room. 'Pre-' and 'post-scan' times were compared with demographic details, patient characteristics, anatomical site and study parameters, utilising correlation analysis or analysis of variance (ANOVA). RESULTS: A total of 223 patients (n = 223) underwent 286 investigations in the 23-day review period. Seventy per cent of routine working time was utilised in image acquisition. The 'pre-' and 'post-scan' times together accounted for 19% and 'down' time for 11% of working time. Prolonged 'pre-' and 'post-scan' times were independently associated with age less than 12 years, anaesthesia, sedation and immobility (p < 0.01 in all cases). The longest median combined 'pre-' and 'post-scan' time by anatomical site (cholangiopancreatography, 21:46 min) was more than six times the shortest (pituitary fossa, 3:11 min. CONCLUSION: A critical analysis of magnetic resonance 'pre-' and 'post-scan' times can provide valuable insights into opportunities for enhanced service efficiency.

Palavras-chave : imaging workflow; magnetic resonance imaging; determinants; service efficiency; ANOVA.

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