University of Glasgow School of Biodiversity, One Health and Veterinary Medicine, Glasgow, UK; Royal (Dick) School of Veterinary Studies, University of Edinburgh, Roslin, UK.
Vet-CT, registered office St John's Innovation Centre, Cambridge, UK.
J Equine Vet Sci. 2023 Jul;126:104492. doi: 10.1016/j.jevs.2023.104492. Epub 2023 Apr 16.
Acquisition of magnetic resonance images of the equine limb is still sometimes conducted under general anaesthesia. Despite low-field systems allow the use of standard anaesthetic equipment, possible interferences of the extensive electronic componentry of advanced anaesthetic machines on image quality is unknown. This prospective, blinded, cadaver study investigated the effects of seven standardised conditions (Tafonius positioned as in clinical cases, Tafonius on the boundaries of the controlled area, anaesthetic monitoring only, Mallard anaesthetic machine, Bird ventilator, complete electronic silence in the room (negative control), source of electronic interference [positive control]) on image quality through the acquisition of 78 sequences using a 0.31T equine MRI scanner. Images were graded with a 4-point scoring system, where 1 denoted absence of artefacts and 4 major artefacts requiring repetition in a clinical setting. A lack of STIR fat suppression was commonly reported (16/26). Ordinal logistic regression showed no statistically significant differences in image quality between the negative control and either the non-Tafonius or the Tafonius groups (P = 0.535 and P = 0.881, respectively), and with the use of Tafonius compared to the other anaesthetic machines (P = 0.578). The only statistically significant differences in scores were observed between the positive control and the non-Tafonius (P = 0.006) and the Tafonius groups (P = 0.017). Our findings suggest that anaesthetic machines and monitoring do not appear to affect MRI scan quality and support the use of Tafonius during acquisition of images with a 0.31T MRI system in a clinical context.
获取马腿部的磁共振图像有时仍在全身麻醉下进行。尽管低场系统允许使用标准麻醉设备，但先进麻醉机的广泛电子组件可能会对图像质量产生干扰，目前尚不清楚。这项前瞻性、盲法、尸体研究通过使用 0.31T 马磁共振扫描仪获取 78 个序列，调查了 7 种标准化条件（Tafonius 按临床病例定位、Tafonius 位于控制区域边界、仅麻醉监测、Mallard 麻醉机、Bird 呼吸机、房间内完全电子静默（阴性对照）、电子干扰源[阳性对照]）对图像质量的影响。通过 4 分制评分系统对图像进行分级，其中 1 表示无伪影，4 表示在临床环境中需要重复的主要伪影。普遍报道 STIR 脂肪抑制缺失（16/26）。有序逻辑回归显示，在阴性对照与非 Tafonius 或 Tafonius 组之间，图像质量没有统计学差异（P=0.535 和 P=0.881），与使用 Tafonius 相比，与其他麻醉机之间也没有统计学差异（P=0.578）。唯一观察到的统计学差异是阳性对照与非 Tafonius 组（P=0.006）和 Tafonius 组（P=0.017）之间的评分。我们的研究结果表明，麻醉机和监测似乎不会影响 MRI 扫描质量，并支持在临床环境中使用 0.31T MRI 系统获取图像时使用 Tafonius。
