Scan time and patient dose for thoracic imaging in neonates and small children using axial volumetric 320-detector row CT compared to helical 64-, 32-, and 16- detector row CT acquisitions.
Scan time and patient dose for thoracic imaging in neonates and small children using axial volumetric 320-detector row CT compared to helical 64-, 32-, and 16- detector row CT acquisitions.
复制标题
DOI：
10.1007/s00247-009-1436-x
复制
发表时间：
2010-03
影响因子：
2.3
通讯作者：
Geleijns J
中科院分区：
文献类型：
--
作者：
Kroft LJ;Roelofs JJ;Geleijns J
最近，320探测器行CT（MDCT）扫描仪已成为可用的，允许轴向体积扫描的16厘米长的范围（50厘米的视野），在一个单一的0.35秒的旋转。对于新生儿和幼儿成像，容积扫描具有潜在的巨大优势，因为整个扫描范围可以在0.35 s内获得，这可以减少运动伪影，并可以减少临床CT成像中对镇静的需求。此外，由于不存在与轴向体积扫描相关的超范围，因此这可能会减少患者辐射剂量。通过体模研究评价使用轴向锥形束和螺旋扇束MDCT采集进行新生儿和幼儿胸部成像的扫描时间和患者剂量。评估了320-MDCT容积扫描仪（AqueolONE，Toshiba，Otawara，Japan）的儿科成像方案。320-MDCT扫描仪可进行覆盖范围达160 mm的锥束采集，但也可在64-、32-或16-MDCT模式下进行螺旋扇束采集。所评价的采集配置为：轴向容积扫描为320 × 0.5 mm、240 × 0.5 mm和160 × 0.5 mm，螺旋扫描为64 × 0.5 mm、32 × 0.5 mm和16 × 0.5 mm。对临床相关儿科血管造影或胸部/纵隔采集方案进行剂量评估，管电压为80或100 kVp，管电流为40 - 80 mA。320-MDCT采集的扫描时间为0.35 s，螺旋采集的扫描时间在1.9 s和8.3 s之间变化。与螺旋扫描相比，轴向容积扫描实现了18%至40%的剂量节省（分别为160 mm和80 kVp的320与64-MDCT，以及80 mm和100 kVp的320与16-MDCT）。与螺旋64、32和16-MDCT扫描相比，轴向320-MDCT容积扫描的辐射剂量在统计学上显著降低。使用容积320-MDCT对新生儿和幼儿进行胸部轴位CT扫描的速度比螺旋扫描快5 - 24倍，并且可以节省患者剂量。
Recently a 320-detector-row CT (MDCT) scanner has become available that allows axial volumetric scanning of a 16-cm-long range (50 cm field of view) in a single 0.35-s rotation. For imaging neonates and small children, volume scanning is potentially of great advantage as the entire scan range can be acquired in 0.35 s, which can reduce motion artefacts and may reduce the need for sedation in clinical CT imaging. Also, because there is no over-ranging associated with axial volumetric scanning, this may reduce patient radiation dose. To evaluate, by means of a phantom study, scan time and patient dose for thoracic imaging in neonates and small children by using axial cone-beam and helical fan-beam MDCT acquisitions. Paediatric imaging protocols were assessed for a 320-MDCT volumetric scanner (Aquilion ONE, Toshiba, Otawara, Japan). The 320-MDCT scanner allows for cone-beam acquisitions with coverage up to 160 mm, but it also allows for helical fan-beam acquisitions in 64-, 32-, or 16-MDCT modes. The acquisition configurations that were evaluated were 320 × 0.5 mm, 240 × 0.5 mm, and 160 × 0.5 mm for axial volumetric scanning, and 64 × 0.5 mm, 32 × 0.5 mm, and 16 × 0.5 mm for helical scanning. Dose assessment was performed for clinically relevant paediatric angiographic or chest/mediastinum acquisition protocols with tube voltages of 80 or 100 kVp and tube currents between 40 and 80 mA. Scan time was 0.35 s for 320-MDCT acquisitions, scan times varied between 1.9 s and 8.3 s for helical acquisitions. Dose savings varying between 18% and 40% were achieved with axial volumetric scanning as compared to helical scanning (for 320- versus 64-MDCT at 160 mm and 80 kVp, and for 320- versus 16-MDCT at 80 mm and 100 kVp, respectively). Statistically significant reduction in radiation dose was found for axial 320-MDCT volumetric scanning compared to helical 64-, 32-, and 16-MDCT scanning. Axial thoracic CT of neonates and small children with volumetric 320-MDCT can be performed between 5 and 24 times faster compared to helical scanning and can save patient dose.