Assessment of Magnetic Resonance Imaging Artefacts Caused by Equine Anaesthesia Equipment: A Cadaver Study.
Authors: Testa Barbara, Biggi Marianna, Byrne Christian A, Bell Andrew
Journal: Journal of equine veterinary science
Summary
# Editorial Summary When acquiring MRI images of equine limbs under general anaesthesia, practitioners have long questioned whether the electronic equipment required for safe sedation might compromise image quality—a particular concern with low-field systems where such interference risk remains poorly characterised. Testa and colleagues conducted a rigorous cadaver study using a 0.31T equine MRI scanner, systematically testing seven conditions including two different anaesthetic machines (Mallard and Bird ventilator), electronic monitoring equipment, and the popular Tafonius patient positioning system, with image quality assessed on a four-point scale where scores of 3–4 indicate artefacts serious enough to require repetition. Remarkably, ordinal logistic regression analysis revealed no statistically significant degradation in image quality when anaesthetic machines, monitoring devices, or Tafonius positioning were present compared to silent baseline conditions (P = 0.535–0.881), with differences only emerging between deliberately introduced electronic interference and active equipment scenarios (P = 0.006–0.017). The findings provide evidence-based reassurance that standard anaesthetic equipment poses negligible risk to diagnostic imaging quality on 0.31T systems, though practitioners should note that STIR fat suppression deficiencies occurred in 16 of 26 sequences—an unrelated technical issue worth monitoring. For equine practitioners balancing anaesthetic safety against imaging requirements, this study supports proceeding with familiar anaesthetic protocols during MRI acquisition without fear of compromising diagnostic utility.
Read the full abstract on PubMed
Practical Takeaways
- •Anaesthetic machines and monitoring equipment can be safely used during 0.31T MRI acquisition without compromising image quality in clinical practice
- •Tafonius equipment specifically poses no risk to MRI scan quality and supports safe general anaesthesia during equine limb imaging
- •Focus quality control efforts on imaging protocol optimization (e.g., STIR fat suppression) rather than equipment removal from the MRI suite
Key Findings
- •No statistically significant differences in MRI image quality between negative control and non-Tafonius (P=0.535) or Tafonius groups (P=0.881)
- •Tafonius anaesthetic equipment showed no significant difference in image quality compared to other anaesthetic machines (P=0.578)
- •Only positive control (electronic interference source) showed statistically significant differences from both non-Tafonius (P=0.006) and Tafonius groups (P=0.017)
- •STIR fat suppression artifacts were common (16/26 sequences) but not attributable to anaesthetic equipment