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Optimal dose of contrast medium for depiction of hypervascular HCC on dynamic MDCT

Tetsuya Fujigai1, Seishi Kumano, Masahiro Okada

  • 1Department of Radiology, Kinki University School of Medicine, Osakasayama City, Osaka 589-8511, Japan. tetuyafu2000@yahoo.co.jp

European Journal of Radiology
|February 7, 2012
PubMed

Insights

A higher dose of contrast medium (630 mgI/kg) significantly improves the visualization of hypervascular hepatocellular carcinoma (HCC) during dynamic MDCT scans. This optimal dose enhances tumor-liver contrast and hepatic enhancement across all phases.

Area of Science:

  • Radiology
  • Medical Imaging
  • Hepatobiliary Imaging

Background:

  • Hepatocellular carcinoma (HCC) is a common primary liver malignancy.
  • Accurate depiction of hypervascular HCC is crucial for diagnosis and treatment planning.
  • Dynamic multidetector-row computed tomography (MDCT) is a key imaging modality for HCC evaluation.

Purpose of the Study:

  • To determine the optimal contrast medium dose for visualizing hypervascular HCC.
  • To evaluate contrast enhancement during hepatic arterial phase (HAP), portal venous phase (PVP), and delayed phase (DP) of dynamic MDCT.
  • To compare the efficacy of two different contrast doses (525 mgI/kg vs. 630 mgI/kg).

Main Methods:

  • Prospective study involving 128 patients with 56 hypervascular HCCs.
  • Patients randomized to receive either 525 mgI/kg (Protocol A) or 630 mgI/kg (Protocol B) of contrast medium.
  • Measurements included attenuation values of aorta, portal vein, hepatic vein, parenchyma, and HCC; tumor-liver contrast (TLC) was calculated.

Main Results:

  • Protocol B (630 mgI/kg) yielded significantly higher aortic attenuation values across all phases (P<0.01).
  • Hepatic enhancement was significantly greater with Protocol B compared to Protocol A during all phases (P<0.01).
  • Tumor-liver contrast was significantly higher with Protocol B during the HAP (P=0.042).

Conclusions:

  • A contrast dose of 630 mgI/kg significantly improves hypervascular HCC depiction during HAP.
  • This higher dose ensures sufficient hepatic enhancement (≥50 HU) during the delayed phase.
  • The findings support 630 mgI/kg as the optimal dose for dynamic MDCT evaluation of hypervascular HCC.
Abstract

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