Garcia P A, Bonaldi V M, Bret P M, Liang L, Reinhold C, Atri M
Department of Diagnostic Radiology, Montreal General Hospital, McGill University, Quebec, Canada.
Radiology. 1996 Apr;199(1):185-9. doi: 10.1148/radiology.199.1.8633144.
To determine the effect of the rate of contrast medium injection on liver enhancement at computed tomography (CT).
Forty-five patients who underwent a follow-up CT examination of the liver were included in five different groups according to the compared rates of contrast material delivery: group A, 2 versus 3 mL/sec; group B, 2 versus 4.5 mL/sec; group C, 3 versus 4.5 mL/sec; group D, 3 versus 6 mL/sec; and group E, 4.5 versus 6 mL/sec.
Time to peak enhancement was shorter for the faster rates of injection. In each group, maximum enhancement was nearly identical for the paired examinations (group A, 57 vs 58 HU; group B, 48 vs 47 HU; group C, 55 vs 58 HU; group D, 55 vs 54 HU; group E, 62 vs 61 HU, respectively). Mean enhancement in each group was similar when calculated at 3-second intervals.
Higher rates of injection shorten the time to peak liver enhancement but have no effect on maximum liver enhancement.
确定对比剂注射速率对肝脏计算机断层扫描（CT）增强效果的影响。
45例接受肝脏随访CT检查的患者，根据对比剂注射速率分为5组：A组，2ml/秒与3ml/秒；B组，2ml/秒与4.5ml/秒；C组，3ml/秒与4.5ml/秒；D组，3ml/秒与6ml/秒；E组，4.5ml/秒与6ml/秒。
注射速率越快，达到峰值增强的时间越短。在每组中，配对检查的最大增强值几乎相同（A组分别为57HU和58HU；B组为48HU和47HU；C组为55HU和58HU；D组为55HU和54HU；E组为62HU和61HU）。以3秒间隔计算时，每组的平均增强值相似。
较高的注射速率可缩短肝脏达到峰值增强的时间，但对肝脏的最大增强效果无影响。
