Clinical Report: Sex Differences in Contrast Enhancement in Thoracoabdominal CT

Overview

This study investigated whether women receive higher iodine contrast enhancement than men when administered identical volumes of iodinated contrast media (CM) during thoracoabdominal CT imaging. Using photon-counting detector CT (PCD-CT), the study found significant sex differences in iodine contrast enhancement despite standardized CM dosing protocols.

Background

Intravenous iodinated contrast media are essential for enhancing diagnostic imaging quality but carry risks such as allergic reactions and nephropathy. Traditionally, CM dosing is based on body weight or fixed volumes, but emerging evidence suggests that patient-specific factors like lean body weight or blood volume may better tailor dosing. Recent data indicate women may be more susceptible to adverse effects from CM, potentially due to higher relative iodine exposure when fixed doses are used. Photon-counting detector CT enables precise quantification of iodine contrast, facilitating investigation of sex-specific differences in enhancement.

Data Highlights

Key Findings

• Women demonstrated significantly higher iodine contrast enhancement than men despite receiving identical CM volumes.
• Standardized fixed CM dosing protocols may lead to relative overexposure in women compared to men.
• Sex differences in iodine contrast were observed using spectral data from PCD-CT without additional post-processing.
• Patient characteristics such as lean body weight, body surface area, or blood volume may better guide individualized CM dosing to achieve sex-invariant enhancement.
• Excluding patients with altered CM dosing due to low BMI or renal impairment ensured assessment of sex differences under standardized conditions.

Clinical Implications

These findings highlight the need for sex-specific contrast media dosing strategies in thoracoabdominal CT to minimize the risk of overexposure in women. Incorporating patient-specific parameters beyond body weight, such as blood volume or lean body mass, may optimize iodine dosing and reduce adverse effects. Routine use of PCD-CT spectral imaging can facilitate personalized contrast administration protocols.

Conclusion

The study demonstrates that women are at risk of relative overexposure to iodinated contrast media under standardized dosing protocols. Individualized, sex-specific CM dosing guided by advanced imaging metrics may improve safety and diagnostic quality in thoracoabdominal CT.

References

1. Article Source 2024 -- Are Women at Risk of Overexposure? A Review of Standardized Contrast Administration in Thoracoabdominal CT Imaging