Bolen Géraldine, Haye Dimitri, Dondelinger Robert, Busoni Valeria
Department of Companion Animals and Equidae, Medical Imaging Section, Faculty of Veterinary Medicine, University of Liège, Boulevard de Colonster, 20, Baltiment B41, 4000 Liège, Belgium.
Vet Radiol Ultrasound. 2010 Jan-Feb;51(1):19-24. doi: 10.1111/j.1740-8261.2009.01615.x.
When ex vivo magnetic resonance (MR) imaging studies are undertaken, specimen conservation should be taken into account when interpreting MR imaging results. The purpose of this study was to assess MR changes during time in the anatomic structures of the equine digit on eight cadaver limbs stored at 4 degrees C. The digits were imaged within 12 h after death and then after 1, 2, 7, and 14 days of refrigeration. After the last examination, four feet were warmed at room temperature for 24 h and reimaged. Sequences used were turbo spin echo (TSE) T1, TSE T2, short tau inversion recovery (STIR), and double-echo steady state (DESS). Images obtained were compared subjectively side by side for image quality and signal changes. Signal-to-noise ratio (SNR) was measured and compared between examinations. There were no subjective changes in image quality. A mild size reduction of the synovial recesses was detected subjectively. No signal change was seen subjectively except for bone marrow that appeared slightly hyperintense in STIR and slightly hypointense in TSE T2 sequence after refrigeration compared with day 0. Using quantitative analysis, significant SNR changes in bone marrow of refrigerated limbs compared with day 0 were detected in STIR and TSE T2 sequences. Warming at room temperature for 24 h produced a reverse effect on SNR compared with refrigeration with a significant increase in SNR in TSE T2 images. After 14 days of refrigeration a statistically significant decrease of SNR was found in bone marrow in TSE T2 and DESS sequences. The SNR in the deep digital flexor tendon was not characterized by significant change in SNR.
进行离体磁共振（MR）成像研究时，在解释MR成像结果时应考虑标本保存情况。本研究的目的是评估保存在4℃的8个马尸体肢体上的马趾解剖结构随时间的MR变化。在死亡后12小时内对趾部进行成像，然后在冷藏1、2、7和14天后再次成像。在最后一次检查后，将四只脚在室温下加热24小时并重新成像。使用的序列包括快速自旋回波（TSE）T1、TSE T2、短tau反转恢复（STIR）和双回波稳态（DESS）。对获得的图像进行主观并排比较，以观察图像质量和信号变化。测量并比较各次检查之间的信噪比（SNR）。图像质量没有主观变化。主观上检测到滑膜隐窝有轻微缩小。除骨髓外，主观上未观察到信号变化，与第0天相比，冷藏后骨髓在STIR序列中呈轻度高信号，在TSE T2序列中呈轻度低信号。通过定量分析，与第0天相比，冷藏肢体骨髓在STIR和TSE T2序列中检测到显著的SNR变化。与冷藏相比，在室温下加热24小时对SNR产生相反的影响，TSE T2图像中的SNR显著增加。冷藏14天后，在TSE T2和DESS序列中发现骨髓的SNR有统计学意义的下降。指深屈肌腱中的SNR没有显著变化。
