Department of Radiology, Kumamoto Chuo Hospital, 1-5-1, Tainoshima, Kumamoto 862-0965, Japan.
Eur Radiol. 2013 Jul;23(7):1911-8. doi: 10.1007/s00330-013-2790-5. Epub 2013 Feb 27.
To evaluate the quality of magnetic resonance cholangiopancreatography (MRCP) images obtained with a three-dimensional navigator-gated (NG) technique and compare findings with conventional respiratory-triggered (RT) images in pre-laparoscopic cholecystectomy patients.
Turbo-spin-echo (TSE) RT-MRCP (average 242 s) and balanced turbo-field-echo (bTFE) NG-MRCP (average 263 s) were acquired at 1.5-T MRI for 49 pre-laparoscopic cholecystectomy patients. Two radiologists independently assessed image quality, visibility of anatomical structures, common bile duct (CBD) stones, and signal-to-noise ratios (SNRs). Interobserver agreement was also evaluated.
The anatomical details of the cystic duct were clearly demonstrated in 33 (67.3 %, reader A) and 35 (71.4 %, reader B) patients on RT-MRCP, and in 45 (91.8 %) and 44 (89.7 %) patients on NG-MRCP. On NG-MRCP, visualisation of the cystic duct (3.22/3.12), its origin (3.57/3.55), and the gallbladder(3.61/3.59) was statistically better than on RT-MRCP (2.90/2.78, 3.29/3.12, 2.98/2.88, respectively). The overall image quality was statistically better on NG-MRCP than RT-MRCP. Each technique identified the presence of CBD stones in all affected patients. The SNR was significantly higher on NG-MRCP (CHD 22.40, gallbladder 17.13) than RT-MRCP (CHD 17.05, gallbladder 9.30). Interobserver agreement was fair to perfect.
Navigator-gated MRCP is more useful than respiratory-triggered MRCP for evaluating the gallbladder and cystic duct in patients scheduled for laparoscopic cholecystectomy.
• Magnetic resonance cholangiopancreatography (MRCP) provides important cystic duct information before laparoscopic cholecystectomy. • Navigator-gated (NG) MRCP images were better than conventional respiratory-triggered (RT) MRCP. • The signal-to-noise ratio was significantly higher for NG-MRCP than for conventional RT-MRCP. • Balanced turbo-field-echo NG-MRCP is useful for evaluating the gallbladder and cystic duct.
评估三维导航门控（NG）技术与传统呼吸触发（RT）技术获得的磁共振胰胆管成像（MRCP）的图像质量，并比较两种方法在腹腔镜胆囊切除术患者中的应用。
对 49 例拟行腹腔镜胆囊切除术的患者进行了 1.5T MRI 上的涡轮自旋回波（TSE）RT-MRCP（平均 242 秒）和平衡涡轮场回波（bTFE）NG-MRCP（平均 263 秒）采集。两名放射科医生独立评估了图像质量、解剖结构的可视性、胆总管（CBD）结石和信噪比（SNR）。还评估了观察者间的一致性。
在 RT-MRCP 上，33 名（67.3%，读者 A）和 35 名（71.4%，读者 B）患者的胆囊管解剖细节显示清晰，在 NG-MRCP 上，45 名（91.8%）和 44 名（89.7%）患者的胆囊管解剖细节显示清晰。在 NG-MRCP 上，胆囊管（3.22/3.12）、胆囊管起源（3.57/3.55）和胆囊（3.61/3.59）的显示明显优于 RT-MRCP（2.90/2.78、3.29/3.12、2.98/2.88）。总体图像质量在 NG-MRCP 上明显优于 RT-MRCP。两种技术均能在所有受影响的患者中发现 CBD 结石。NG-MRCP 的 SNR 明显高于 RT-MRCP（CBD 22.40，胆囊 17.13）。观察者间的一致性为中等到极好。
与传统的呼吸触发 MRCP 相比，导航门控 MRCP 更有助于评估拟行腹腔镜胆囊切除术患者的胆囊和胆囊管。
磁共振胰胆管成像（MRCP）在腹腔镜胆囊切除术前提供了重要的胆囊管信息。
导航门控（NG）MRCP 图像优于传统呼吸触发（RT）MRCP。
NG-MRCP 的信噪比明显高于传统 RT-MRCP。
平衡涡轮场回波 NG-MRCP 可用于评估胆囊和胆囊管。
