Weipers Centre Equine Hospital, School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK.
Equine Vet J. 2021 May;53(3):469-480. doi: 10.1111/evj.13330. Epub 2020 Sep 5.
Investigation of image quality in clinical equine magnetic resonance (MR) imaging may optimise diagnostic value.
To assess the influence of field strength and anaesthesia on image quality in MR imaging of the equine foot in a clinical context.
Analytical clinical study.
Fifteen equine foot studies (five studies per system) were randomly selected from the clinical databases of three MR imaging systems: low-field standing (LF St), low-field anaesthetised (LF GA) and high-field anaesthetised (HF GA). Ten experienced observers graded image quality for entire studies and seven clinically important anatomical structures within the foot (briefly, grade 1: textbook quality, grade 2: high diagnostic quality, grade 3: satisfactory diagnostic quality, grade 4: non-diagnostic). Statistical analysis assessed the effect of anaesthesia and field strength using a combination of the Pearson chi-square test or Fisher's exact test and Mann-Whitney test.
There was no difference in the proportion of entire studies of diagnostic quality between LF St (90%, 95% CI 78%-97%) and LF GA (88%, 76-95%, P = .7). No differences were evident in the proportion of diagnostic studies or median image quality gradings between LF St and LF GA when assessing individual anatomical structures (both groups all median grades = 3). There was a statistically significant difference in the proportion of entire studies of diagnostic quality between LF GA and HF GA (100%, 95% CI lower bound 94%, P = .03). There were statistically significant differences in median image quality gradings between LF GA (all median grades = 3) and HF GA (median grades = 1 (5/7 structures) or 2 (2/7 structures) for all individual anatomical structures (all P < .001). The reasons reported for reduced image quality differed between systems.
Randomised selection of cases from clinical databases. Individual observer preferences may influence image quality assessment.
Field strength is a more important influencer of image quality than anaesthesia for magnetic resonance imaging of the equine foot in clinical patients.
研究临床马磁共振成像中的图像质量可以优化诊断价值。
在临床环境下评估马足部磁共振成像中磁场强度和麻醉对图像质量的影响。
分析性临床研究。
从三个磁共振成像系统的临床数据库中随机选择 15 个马足部研究（每个系统 5 个研究）：低场站立（LF St）、低场麻醉（LF GA）和高场麻醉（HF GA）。10 名有经验的观察者对整个研究和足部的 7 个重要临床解剖结构（简称，1 级：教科书质量，2 级：高诊断质量，3 级：满意的诊断质量，4 级：无诊断质量）的图像质量进行分级。使用 Pearson 卡方检验或 Fisher 确切检验和 Mann-Whitney 检验的组合评估麻醉和磁场强度的影响。
LF St（90%，95%CI 78%-97%）和 LF GA（88%，76-95%，P=.7）之间的诊断质量研究比例没有差异。当评估个别解剖结构时，LF St 和 LF GA 之间的诊断研究比例或中位数图像质量分级没有差异（两组所有中位数分级均为 3）。LF GA 和 HF GA 之间的诊断质量研究比例存在统计学差异（100%，95%CI 下限 94%，P=.03）。LF GA（所有中位数分级均为 3）和 HF GA（所有结构中位数分级为 1（5/7 个结构）或 2（2/7 个结构））之间的中位数图像质量分级存在统计学差异（所有 P<.001）。不同系统之间报告的图像质量降低的原因不同。
从临床数据库中随机选择病例。个体观察者的偏好可能会影响图像质量评估。
在临床患者的马磁共振成像中，磁场强度是比麻醉更重要的图像质量影响因素。
