Larsen Solveig Kärk Abildtrup, Sivesgaard Kim, Pedersen Erik Morre
Department of Radiology, Aarhus University Hospital, Denmark.
Eur J Radiol Open. 2021 Aug 26;8:100374. doi: 10.1016/j.ejro.2021.100374. eCollection 2021.
To prospectively compare artefacts and image quality in testicular stage I cancer patients using different combinations of breathing schemes and Multi-band (MB) in whole-body DWIBS at 1.5 T.Diffusion-Weighted whole-body Imaging with Background body signal Suppression (DWIBS) using inversion recovery (IR) fat saturation is a cornerstone in oncologic whole-body MRI, but implementation is restrained by long acquisition times. The new Multi-Band (MB) technique reduces scan time which can be reinvested in respiratory compensation.
Thirty testicular cancer stage I patients were included. Three variations of whole-body DWIBS were tested: Standard free Breathing (FB)-DWIBS, FB-MB-DWIBS and Respiratory triggered (RT)-MB-DWIBS. Artefacts and image quality of b = 800 s/mm images were evaluated using a Likert scale. No pathology was revealed. SNR was calculated in a healthy volunteer.
RT-MB-DWIBS was rated significantly better than FB-DWIBS in the thorax (p < 0.001) and abdomen (p < 0.001), but not in the pelvis (p = 0.569). FB-MB-DWIBS was ranked significantly lower than both FB-DWIBS (p < 0.001) and RT-MB-DWIBS (p < 0.001) at all locations. However, FB-MB-DWIBS was scanned in half the time without being less than "satisfactory". Few artefacts were encountered. SNR was similar for low-intensity tissues, but the SNR in high-intensity and respiratory-prone tissue (spleen) was slightly lower for FB-DWIBS than the other sequences.
Images produced by the sequences were similar. MB enables the use of respiratory trigger or can be used to produce very fast free-breathing DWI with acceptable image quality.
前瞻性比较1.5T全身扩散加权体部成像背景抑制（DWIBS）中，睾丸I期癌患者使用不同呼吸方案和多频段（MB）组合时的伪影和图像质量。使用反转恢复（IR）脂肪饱和的扩散加权全身成像背景抑制（DWIBS）是肿瘤全身MRI的基石，但由于采集时间长而限制了其应用。新的多频段（MB）技术可缩短扫描时间，从而可将其重新用于呼吸补偿。
纳入30例睾丸I期癌患者。测试了全身DWIBS的三种变体：标准自由呼吸（FB）-DWIBS、FB-MB-DWIBS和呼吸触发（RT）-MB-DWIBS。使用李克特量表评估b = 800 s/mm²图像的伪影和图像质量。未发现病理情况。在一名健康志愿者中计算信噪比。
RT-MB-DWIBS在胸部（p < 0.001）和腹部（p < 0.001）的评分明显优于FB-DWIBS，但在骨盆部（p = 0.569）并非如此。在所有部位，FB-MB-DWIBS的排名均明显低于FB-DWIBS（p < 0.001）和RT-MB-DWIBS（p < 0.001）。然而，FB-MB-DWIBS的扫描时间减半且图像质量不低于“满意”。遇到的伪影很少。低强度组织的信噪比相似，但FB-DWIBS在高强度和易受呼吸影响的组织（脾脏）中的信噪比略低于其他序列。
各序列产生的图像相似。MB可使用呼吸触发，或可用于产生具有可接受图像质量的非常快速的自由呼吸DWI。
