Radiology Practice Test 2026 - Free Radiology Practice Questions and Study Guide

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What does DEXA stand for and what does it measure?

Dynamic X-ray Assessment; it measures soft tissue density

Dual-Energy X-ray Absorptiometry; it measures bone mineral density

DEXA stands for Dual-Energy X-ray Absorptiometry, a widely used imaging technique primarily employed to measure bone mineral density. This method utilizes two different X-ray energy levels to accurately distinguish between bone and soft tissue, thereby facilitating the assessment of bone health. By comparing the absorption of the X-rays at these two energy levels, DEXA provides precise measurements that can help diagnose conditions like osteoporosis and assess fracture risk. The strength and density of bones can be critical indicators of overall skeletal health, making DEXA an essential tool in both clinical and research settings.

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Digital Examination X-ray Apparatus; it measures organ size

Direct Energy X-ray Analysis; it measures blood oxygen levels

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