Dose reduction in spiral CT angiography of thoracic outlet syndrome by anatomically adapted tube current modulation
Dose reduction in spiral CT angiography of thoracic outlet syndrome by anatomically adapted tube current modulation
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通过适应解剖学的管电流调制减少胸廓出口综合征螺旋 CT 血管造影的剂量
DOI：
10.1007/s003300000752
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发表时间：
2001
影响因子：
5.9
通讯作者：
Jacques Remy
中科院分区：
文献类型：
--
作者：
I. Mastora;M. Rémy;C. Suess;C. Scherf;J. Guillot;Jacques Remy
本研究的目的是评估在线管流控制在胸廓出口螺旋CT血管造影中的剂量降低。前瞻性研究：114例接受锁骨下动脉螺旋CT血管造影治疗胸廓出口动脉综合征的患者，在同一时段进行管电流调制和不进行管电流调制的评估（连续两次血管造影的扫描参数，一次在中立位，一次在体位操作后）：140 kV；206年马;扫描时间0.75 s；准直3mm；Pitch = 1)。前92例连续患者在中立位使用剂量减少系统，其余22例连续患者在体位调整后使用剂量减少系统。分析整个研究组（第1组；n= 114）的剂量减少和图像质量。114例患者中有44例（第二组）评估了手臂位置的影响，与上胸的横向直径相匹配。1组平均剂量减少33%（范围22 - 40%），2组平均剂量减少34%（范围26 - 40%）。在第二组中，与参考扫描相比，无论患者的手臂位置如何，图像质量的唯一差异是低剂量扫描的颗粒化频率明显更高，44名患者中有38名（86%）被评为最小。2组体位操作后应用低剂量技术：(a)平均剂量减少量显著高于对照组（35% vs 32%, p= 0.006）；(b)颗粒性较少（82% vs 91%中立位）；(c)被评为最小颗粒的百分比明显更高（83% vs 70%在中性位置；p= 0.2027）。在线管流调制可以在胸廓出口高质量的诊断性螺旋CT血管造影上降低剂量，应在中性体位和体位调整后的数据采集过程中应用，以获得最佳效果。
The aim of this study was to evaluate dose reduction in spiral CT angiography of the thoracic outlet by on-line tube-current control. Prospectively, 114 patients undergoing spiral CT angiography of the subclavian artery for thoracic outlet arterial syndromes were evaluated with and without tube-current modulation at the same session (scanning parameters for the two successive angiograms, one in the neutral position and one after the postural maneuver): 140 kV; 206 mA; scan time 0.75 s; collimation 3 mm; pitch = 1). The dose reduction system was applied in the neutral position in the first 92 consecutive patients and after postural maneuver in the remaining 22 consecutive patients. Dose reduction and image quality were analyzed in the overall study group (group 1;n= 114). The influence of the arm position was assessed in 44 of the 114 patients (group 2), matched by the transverse diameter of the upper thorax. The mean dose reduction was 33 % in group 1 (range 22–40 %) and 34 % in group 2 (range 26–40 %). In group 2 the only difference in image quality was a significantly higher frequency of graininess on low-dose scans compared with reference scans whatever the patient's arm position, graded as minimal in 38 of the 44 patients (86 %). When the low-dose technique was applied after postural maneuver in group 2: (a) the mean dose reduction was significantly higher (35 vs 32 % in the neutral position;p= 0.006); (b) graininess was less frequent (82 vs 91 % in the neutral position); and (c) the percentage of graininess graded as minimal was significantly higher (83 vs 70 % in the neutral position;p= 0.2027). On-line tube-current modulation enables dose reduction on high-quality, diagnostic spiral CT angiograms of the thoracic outlet and should be applied during data acquisition in the neutral position and after postural maneuver for optimal use.