Which imaging modality is used as the first choice to evaluate suspected AAA?

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Doppler ultrasound is the first imaging test for suspected abdominal aortic aneurysm because it is quick, noninvasive, and radiation-free, with bedside availability. It reliably measures the aorta and can detect an aneurysm when the diameter is typically 3 cm or larger, guiding urgent decisions or surveillance. While CT angiography offers detailed anatomy and is preferred for planning repair or evaluating rupture, it requires transport and contrast and isn’t the initial test in a stable patient. MRI provides similar detail but is slower and less accessible, and X-ray isn’t reliable for assessing aneurysm size.