In DXA, detectors separate and measure the ______ and ______ received from the patient.

In DXA, detectors separate and measure the ______ and ______ received from the patient.

• A. High Energy Photons and Low Energy Photons
• B. Low Energy Photons and High Energy Photons
• C. Soft Tissue Photons
• D. Low Energy Photons and High Energy Photons

Answer: (D)

DXA relies on using two different X-ray energy levels to separate how tissues affect the beam. The detectors split the detected X-rays into a low-energy portion and a high-energy portion from the transmitted beam. By comparing how each energy is attenuated as it passes through bone and soft tissue, the system can distinguish the bone mineral content from the soft tissue, because bone and soft tissue absorb low-energy and high-energy photons differently. This dual-energy information is what lets DXA quantify bone density while accounting for the soft tissue surrounding the bone.

DXA relies on using two different X-ray energy levels to separate how tissues affect the beam. The detectors split the detected X-rays into a low-energy portion and a high-energy portion from the transmitted beam. By comparing how each energy is attenuated as it passes through bone and soft tissue, the system can distinguish the bone mineral content from the soft tissue, because bone and soft tissue absorb low-energy and high-energy photons differently. This dual-energy information is what lets DXA quantify bone density while accounting for the soft tissue surrounding the bone.