Increasing contrast agent concentration improves enhancement in first-pass CT perfusion

Area of Science:

• Radiology
• Medical Imaging
• Neurology

Background:

• Acute stroke evaluation relies on advanced imaging techniques.
• CT perfusion (CTP) is crucial for assessing brain tissue viability.
• Optimizing contrast agent properties is key for accurate CTP interpretation.

Purpose of the Study:

• To determine if increasing iodine concentration enhances brain tissue opacification.
• To evaluate the effect of contrast concentration on CTP in acute stroke patients.
• To compare different iodine concentrations (300, 350, 400 mg/mL) at a constant total dose.

Main Methods:

• 102 acute stroke patients underwent CTP with varying contrast concentrations (300, 350, 400 mg/mL).
• Total iodine dose and injection rate were standardized.
• Peak opacification in gray matter, white matter, arterial input, and venous output was analyzed.

Main Results:

• Peak opacification increased monotonically with higher iodine concentrations across all regions.
• Significant improvements in opacification were noted between all tested concentrations.
• The highest concentration (400 mg/mL) demonstrated superior opacification compared to lower concentrations.

Conclusions:

• Higher iodine concentration contrast agents significantly improve brain tissue opacification.
• CTP for acute stroke evaluation benefits from using the highest available contrast concentration.
• Optimized contrast concentration enhances diagnostic confidence in acute stroke imaging.