What type of beam does the fan beam scanner utilize?

• A. Collimated x-ray beam
• B. Fan shaped beam
• C. Pencil beam
• D. Converged beam

Answer: (B)

The fan beam scanner utilizes a fan-shaped beam, which is designed to efficiently cover a larger area of the bone or tissue being examined. This type of beam is important in bone densitometry because it allows for a wider field of view, capturing more data in less time compared to other beam types. The fan-shaped configuration enables the scanner to obtain detailed images with multiple detectors that can record data simultaneously, ultimately enhancing the accuracy of bone density measurements. This approach contrasts with pencil beams, which are narrower and typically scan one point at a time; therefore, they do not offer the same speed or area coverage as a fan beam. The fan beam's design is crucial for optimal performance in clinical settings, contributing to quick and accurate assessments of bone density.