Body weight-based iodinated contrast immersion timing for human fetal postmortem microfocus computed tomography

Area of Science:

• Medical Imaging
• Radiology
• Forensic Science

Background:

• Microfocus computed tomography (micro-CT) is crucial for postmortem fetal imaging.
• Accurate contrast enhancement is vital for optimal micro-CT image quality.
• Determining optimal iodination time for contrast agents is essential for efficient imaging protocols.

Purpose of the Study:

• To evaluate the time required for full iodination using potassium tri-iodide in human fetuses.
• To establish a predictive model for optimal iodination time prior to fetal micro-CT imaging.

Main Methods:

• Prospective assessment of 157 human fetuses with varying postmortem weights and gestational ages.
• Analysis using simple linear regression to correlate demographic factors with iodination time.
• Development of a simplified equation for estimating optimal iodination duration.

Main Results:

• Postmortem body weight demonstrated a strong correlation with iodination time (r² = 0.6435) compared to gestational age (r² = 0.1384).
• A predictive equation was derived: immersion time (days) = [0.03 × body weight (g)] - 2.2.
• Example calculation showed a 100g fetus requires 5.2 days for optimal contrast enhancement.

Conclusions:

• A simplified, empirically derived equation can reliably estimate fetal contrast preparation time for micro-CT.
• This estimation aids in managing service throughput and parental expectations.
• The findings facilitate more efficient and predictable fetal postmortem micro-CT imaging workflows.