DEXA Scan Operation & Technique

Question 1

What is the purpose of DEXA scanning?

Accepted Answer

Measure bone mineral density

Answer

DEXA (Dual-energy X-ray Absorptiometry) scanning is a specialized medical imaging technique used to accurately measure bone mineral density (BMD). It is the gold standard for diagnosing osteoporosis and assessing an individual's risk of fractures. The scan uses two different X-ray beams to differentiate between bone and soft tissue, providing precise BMD values.

Question 2

Which position is commonly used in a DEXA scan?

Accepted Answer

Supine

Answer

During a DEXA scan, the patient is most commonly positioned supine, meaning lying flat on their back on the examination table. This position ensures optimal alignment and stability for accurate imaging of the lumbar spine and hip, which are the most frequently scanned areas. The supine position minimizes movement artifacts and allows for consistent measurements.

Question 3

What does a high BMD value indicate?

Accepted Answer

Strong bone density

Answer

A high Bone Mineral Density (BMD) value indicates that an individual has strong and healthy bones. This means their bones are dense and less porous, making them more resistant to fractures. Conversely, low BMD values are associated with conditions like osteopenia or osteoporosis, which increase fracture risk.

Question 4

How long does a typical DEXA scan take?

Accepted Answer

10–20 minutes

Answer

A typical DEXA scan is a relatively quick procedure, usually taking between 10 to 20 minutes to complete. The exact duration can vary slightly depending on the number of areas being scanned (e.g., lumbar spine, hip, forearm) and the specific equipment used. This short duration makes it a convenient diagnostic tool.

Question 5

Why calibrate the DEXA machine regularly?

Accepted Answer

Ensure accurate scan results

Answer

Regular calibration of a DEXA machine is absolutely essential to ensure the accuracy and reliability of scan results. Calibration maintains the precision of the X-ray beams and detectors, guaranteeing that the measured bone mineral density values are consistent and correct over time. This is critical for accurate diagnosis, monitoring treatment effectiveness, and comparing results across different scans.

(DEXA) DEXA Bone Density Scan Certification Practice Test

(DEXA) DEXA Bone Density Scan Certification Practice Test

DEXA Scan Operation & Technique