In DXA, newer technology uses ________.

In DXA, newer technology uses ________.

• A. Pencil-beam
• B. Array-beam (or fan-beam) and multi element detector
• C. Pencil-beam and multi element detector
• D. Fan-beam and single detector

Answer: (B)

Modern DXA systems use a wide, fan-shaped (array) beam together with a multi-element detector. This setup lets the scanner collect X-ray transmission data across the entire width of the scanned region in one pass, which speeds up the scan and improves data quality because more detectors are measuring simultaneously. In contrast, older pencil-beam designs project a narrow beam and rely on a single detector that moves across the body to build up the image; this is slower and more susceptible to motion artifacts. By using a fan or array beam and multiple detectors, newer DXA technology achieves faster acquisition, better precision, and more efficient measurement across the scanned area.

Modern DXA systems use a wide, fan-shaped (array) beam together with a multi-element detector. This setup lets the scanner collect X-ray transmission data across the entire width of the scanned region in one pass, which speeds up the scan and improves data quality because more detectors are measuring simultaneously.

In contrast, older pencil-beam designs project a narrow beam and rely on a single detector that moves across the body to build up the image; this is slower and more susceptible to motion artifacts. By using a fan or array beam and multiple detectors, newer DXA technology achieves faster acquisition, better precision, and more efficient measurement across the scanned area.