When imaging a pregnant patient, which consideration should guide the choice of modality?

• A. Use ionizing modalities with high energy to speed up imaging
• B. Avoid imaging entirely during pregnancy
• C. Prioritize non-ionizing modalities and shielding to minimize fetal dose
• D. Use contrast-enhanced CT as first line

Answer: (C)

The priority is to minimize fetal exposure to ionizing radiation by prioritizing non-ionizing imaging modalities and using shielding when ionizing imaging is necessary. Ultrasound and MRI do not involve ionizing radiation, making them preferred when they can provide the needed information. Ultrasound is often first-line for many obstetric and abdominal assessments, while MRI can be used when more detail is required and gadolinium is avoided unless truly necessary. If an imaging study must use ionizing radiation, aim for the lowest reasonable dose and limit the irradiated field to the area of clinical interest; proper shielding of the uterus further reduces dose, though it does not eliminate risk. The other options would either unnecessarily increase fetal radiation exposure, withhold needed diagnosis, or employ a radiation-heavy study as the first choice when safer alternatives exist.