Institute for Clinical Radiology, University Hospital Munich, Marchioninistraße 15, 81377, Munich, Germany.
Eur Radiol. 2017 Dec;27(12):4931-4940. doi: 10.1007/s00330-017-4888-7. Epub 2017 Jul 4.
To demonstrate the feasibility of fast Dual-Source CT (DSCT) and to evaluate the clinical utility in chest/abdomen/pelvis staging CT studies.
45 cancer patients with two follow-up combined chest/abdomen/pelvis staging CT examinations (maximally ±10 kV difference in tube potential) were included. The first scan had to be performed with our standard protocol (fixed pitch 0.6), the second one using a novel fast-speed DSCT protocol (fixed pitch 1.55). Effective doses (ED) were calculated, noise measurements performed. Scan times were compared, motion artefacts and the diagnostic confidence rated in consensus reading.
ED for the standard and fast-speed scans was 9.1 (7.0-11.1) mSv and 9.2 (7.4-12.8) mSv, respectively (P = 0.075). Image noise was comparable (abdomen; all P > 0.05) or reduced for fast-speed CTs (trachea, P = 0.001; ascending aorta, P < 0.001). Motion artefacts of the heart/the ascending aorta (all P < 0.001) and breathing artefacts (P < 0.031) were reduced in fast DSCT. The diagnostic confidence for the evaluation of mediastinal (P < 0.001) and pulmonary (P = 0.008) pathologies was improved for fast DSCT.
Fast DSCT for chest/abdomen/pelvis staging CT examinations is performed within 2 seconds scan time and eliminates relevant intrathoracic motion/breathing artefacts. Mediastinal/pulmonary pathologies can thus be assessed with high diagnostic confidence. Abdominal image quality remains excellent.
• Fast dual-source CT provides chest/abdomen/pelvis staging examinations within 2 seconds scan time. • The sevenfold scan time reduction eliminates relevant intrathoracic motion/breathing artefacts. • Mediastinal/pulmonary pathologies can now be assessed with high diagnostic confidence. • The coverage of the peripheral soft tissues is comparable to single-source CT. • Fast and large-volume oncologic DSCT can be performed with 9 mSv effective dose.
展示快速双源 CT（DSCT）的可行性，并评估其在胸部/腹部/骨盆分期 CT 研究中的临床应用价值。
纳入 45 例接受两次胸部/腹部/骨盆分期 CT 检查的癌症患者（管电压最大差值±10 kV）。第一次扫描必须采用我们的标准方案（固定螺距 0.6），第二次扫描采用新型快速 DSCT 方案（固定螺距 1.55）。计算有效剂量（ED），进行噪声测量。比较扫描时间，进行共识阅读的运动伪影和诊断信心评分。
标准和快速扫描的 ED 分别为 9.1（7.0-11.1）mSv 和 9.2（7.4-12.8）mSv（P=0.075）。图像噪声相当（腹部；所有 P>0.05）或快速 CT 降低（气管，P=0.001；升主动脉，P<0.001）。心脏/升主动脉的运动伪影（所有 P<0.001）和呼吸伪影（P<0.031）在快速 DSCT 中减少。快速 DSCT 对纵隔（P<0.001）和肺部（P=0.008）病变的评估诊断信心提高。
胸部/腹部/骨盆分期 CT 检查的快速 DSCT 可在 2 秒扫描时间内完成，消除相关的胸内运动/呼吸伪影。因此，可以高度自信地评估纵隔/肺部病变。腹部图像质量仍然极佳。
快速双源 CT 可在 2 秒扫描时间内完成胸部/腹部/骨盆分期检查。
扫描时间减少七倍可消除相关的胸内运动/呼吸伪影。
现在可以高度自信地评估纵隔/肺部病变。
外周软组织的覆盖范围与单源 CT 相当。
快速大容量肿瘤 DSCT 可在 9 mSv 有效剂量下完成。
