Which imaging modality is used for bone densitometry?Question 21Select one:a.CT scanb.DEXA scanc.Ultrasoundd.MRI

Break Down the Problem

1. Identify the purpose of the imaging modality: bone densitometry.
2. List the available imaging modalities provided in the options.

Relevant Concepts

Bone densitometry is a technique used to measure the density of bone, primarily to assess the risk of osteoporosis and fractures. Different Imaging modalities can be used for this purpose, including:

• CT scan: Usually used for detailed imaging but not specific for bone density.
• DEXA scan: Specifically designed for measuring bone mineral density (BMD).
• Ultrasound: Can assess bone properties but not typically used for traditional bone density measurements.
• MRI: Useful for soft tissue imaging, not for direct bone density measurement.

Analysis and Detail

• CT Scan: Offers detailed cross-sectional images but not typically used specifically for bone densitometry.
• DEXA Scan: The gold standard for assessing bone density; the Dual-Energy X-ray Absorptiometry (DEXA) uses two X-ray beams at different energy levels to measure bone mineral content.
• Ultrasound: While helpful in assessing other properties of bone, it does not measure density in the same direct way that DEXA does.
• MRI: Advanced imaging for soft tissues, not specifically for bone densitometry.

Verify and Summarize

Among the provided options, the DEXA scan is explicitly designed for evaluating bone density, making it the most appropriate choice for bone densitometry.

Final Answer

b. DEXA scan is the imaging modality used for bone densitometry.