Cost analysis of an open low-field (0.23T) MRI unit: effect of procedure shares in combined imaging, interventional, and neurosurgical use.
OBJECTIVE
To analyze the cost structure of procedures performed in a multipurpose interventional magnetic resonance imaging (IMRI) unit and to analyze the effect of procedure shares on cost structure.


METHODS
During a 1-year period, 691 procedures were performed in the IMRI unit, of which 563 were diagnostic MRI examinations, 89 MRI-guided interventions, and 39 MRI-guided neurosurgical operations. Three alternative utilization models of IMRI were created to simulate different local institutions by adjusting the proportions of different procedures. The costs of procedures were calculated by activity-based cost analysis.


RESULTS
The cost of the main procedure (imaging, biopsy, injection, or operation) was the most significant item in all procedures, accounting for 66-89% of the total costs. The volume of imaging has a major effect on unit costs. Volume is not such a deterministic factor in interventions due to the high material costs. The volume of neurosurgical use of IMRI has a major effect on the costs of radiological procedures due to the long operation times.


CONCLUSIONS
The volumes of different procedures done on an IMRI unit have significant effects on the unit costs of the procedures.
Ronkainen
J
J
Department of Radiology, Oulu University Hospital, Oulu, Finland. johanna.ronkainen@oulu.fi
Tervonen
O
O
D003365:Costs and Cost Analysis; D005387:Finland; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000191:economics* / Q000379:methods / Q000706:statistics & numerical data; D008962:Models, Theoretical; D019635:Neurosurgical Procedures / Q000191:economics* / Q000379:methods / Q000706:statistics & numerical data; D015642:Radiology, Interventional / Q000191:economics* / Q000379:methods / Q000706:statistics & numerical data; D025321:Surgery, Computer-Assisted / Q000191:economics* / Q000379:methods / Q000706:statistics & numerical data