Assessment of the Effects of Administering a Saline Solution Flush after Contrast Medium Injection for Different Injection Durations and Flush Methods

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  • 造影剤注入持続時間および生理食塩水後押し方法の違いにおける生理食塩水後押し効果の検討
  • 臨床技術 造影剤注入持続時間および生理食塩水後押し方法の違いにおける生理食塩水後押し効果の検討
  • リンショウ ギジュツ ゾウエイザイ チュウニュウ ジゾク ジカン オヨビ セイリ ショクエンスイ アトオシ ホウホウ ノ チガイ ニ オケル セイリ ショクエンスイ アトオシ コウカ ノ ケントウ

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The purpose of administering a saline solution flush after contrast medium injection is to more effectively utilize the contrast medium remaining in the vessels from the subclavian vein to the superior vena cava. In order to investigate the effects of administering a saline solution flush after a contrast medium injection, we evaluated the effects of various contrast medium injection durations and injection methods on the time-density curve (TDC) using a custom-made TDC measurement phantom. The TDC was found to have a biphasic appearance, showing a rapid increase after the arrival of contrast medium in the target region followed by a slower increase from an inflection point at 25 s after the start of contrast medium injection, reflecting the differences in circulatory dynamics for each duration. The results showed that the effect of saline solution flush was allowed the differences by contrast medium duration at the inflection point. Specifically, when the saline solution flush was administered before the inflection point, the CT number was increased, and when it was administered after the inflection point, contrast enhancement was prolonged. With regard to the method in which the saline solution flush is administered before the inflection point, it was found that injecting a mixture of contrast medium and saline solution before the saline solution flush reduced the degree of inflection of the TDC, resulting in a more stable TDC.

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