Quantitative computed tomography for bone mineral measurement: technical aspects, dosimetry, normal data and clinical...

Area of Science:

• Radiology
• Bone Densitometry
• Medical Imaging

Background:

• Spinal trabecular bone density assessment is crucial for diagnosing bone diseases.
• Quantitative CT (QCT) offers a method for measuring bone density.
• Trabecular Bone Equivalent Density (TBED) is a standardized measure.

Purpose of the Study:

• To evaluate a single kVp quantitative CT (QCT) technique for measuring spinal trabecular bone density (TBED).
• To establish normative TBED values in a healthy Greek population.
• To assess the correlation of TBED with age and other factors, and its differences in disease states.

Main Methods:

• A single kVp QCT technique was employed to measure TBED.
• TBED was defined using a K2HPO4 solution standard.
• Field non-uniformity correction was applied using phantom experiments.
• In vivo precision was assessed.
• TBED was measured in 206 healthy individuals (30-69 years) and compared with patient groups.

Main Results:

• The effective equivalent dose was 370 muSv.
• In vivo short-term precision ranged from 1.4% to 4.1%.
• Average TBED decreased with age in both sexes, with a caudal reduction tendency.
• No correlation was found with body habitus, milk consumption, smoking (men), or pregnancies.
• Significant differences in TBED were observed between healthy individuals and those with post-menopausal osteoporosis, alcoholism, or post-gastrectomy (Billroth II).

Conclusions:

• Single kVp QCT is a reliable method for measuring spinal TBED.
• Normative data were established for a Greek population.
• QCT demonstrates utility in differentiating healthy bone density from that in osteoporosis and other conditions.