You Su Yeon, Yoon Dae Young, Choi Chul Soon, Chang Suk Ki, Yun Eun Joo, Seo Young Lan, Lee Yu-Jin, Moon Jeung Hee
Department of Radiology, Kangdong Seong-Sim Hospital, Hallym University College of Medicine, Seoul, South Korea.
J Comput Assist Tomogr. 2007 Sep-Oct;31(5):677-81. doi: 10.1097/RCT.0b013e318038d8fb.
To investigate the effects of the right- and left-arm injections of contrast material on image quality in computed tomography of the head and neck.
Sixty patients were prospectively and randomly assigned into 2 groups. Eighty milliliters of contrast material (iodine concentration, 300 mg/mL) was administered into the right (n = 30) or the left (n = 30) antecubital vein at a 2-mL/s injection rate. The attenuation of the carotid artery (CA) and the internal jugular vein (IJV) was measured at 1.5-second intervals in each patient. The mean attenuation values for CA and IJV, the time to reach peak attenuation, the duration of diagnostic window (both CA and IJV enhancement were greater than 150 HU), the perivenous artifacts, and the retrograde flow of contrast material column from the subclavian or brachiocephalic vein were statistically compared between patients with right-arm injection and those with left-arm injection.
The mean attenuation values in CA and IJV were slightly higher in patients with right-arm injection than in those with left-arm injection, although no significant difference was reached (P = 0.06 for CA and 0.07 for IJV). The right-arm injection resulted in significantly reduced perivenous artifacts and retrograde flow of contrast material column. There were no significant differences in the time to reach the peak attenuation and in the duration of the diagnostic window between the 2 groups.
The right-arm injection of contrast material may provide better image quality in the computed tomography of the head and neck when compared with the left-arm injection.
探讨头颈部计算机断层扫描中右臂和左臂注射造影剂对图像质量的影响。
前瞻性地将60例患者随机分为2组。以2 mL/s的注射速率将80毫升造影剂（碘浓度为300 mg/mL）注入右侧（n = 30）或左侧（n = 30）肘前静脉。每隔1.5秒测量每位患者颈动脉（CA）和颈内静脉（IJV）的衰减值。对右臂注射组和左臂注射组患者的CA和IJV的平均衰减值、达到峰值衰减的时间、诊断窗持续时间（CA和IJV增强均大于150 HU）、静脉周围伪影以及造影剂柱从锁骨下静脉或头臂静脉的逆流情况进行统计学比较。
右臂注射患者的CA和IJV平均衰减值略高于左臂注射患者，尽管未达到显著差异（CA为P = 0.06，IJV为P = 0.07）。右臂注射可显著减少静脉周围伪影和造影剂柱的逆流。两组之间达到峰值衰减的时间和诊断窗持续时间无显著差异。
与左臂注射相比，右臂注射造影剂在头颈部计算机断层扫描中可能提供更好的图像质量。
