Developing Cut-off Values for Low and Very Low Bone Mineral Density at the Thoracic Spine Using Quantitative Computed...

Area of Science:

• Radiology
• Osteoporosis Research
• Medical Imaging Analysis

Background:

• Osteoporosis diagnosis relies on bone mineral density (BMD) measurement, often under-diagnosed.
• Quantitative computer tomography (QCT) can measure BMD, with lumbar QCT previously suggested for opportunistic screening.
• Thoracic QCT also shows potential for opportunistic osteoporosis screening.

Purpose of the Study:

• To establish diagnostic cut-off values for low thoracic bone mineral density (BMD) using thoracic QCT.
• To correlate thoracic BMD with lumbar BMD measurements from CT scans.
• To enable opportunistic osteoporosis detection using frequent thoracic CT scans.

Main Methods:

• 177 participants referred for chest pain underwent lumbar and thoracic BMD measurements using non-contrast CT scans.
• Lumbar BMD cut-off values were used to assess corresponding thoracic BMD.
• Linear regression analysis identified new diagnostic thoracic BMD cut-off values.

Main Results:

• Significant differences in BMD were observed between lumbar and thoracic regions (p < 0.001).
• A linear relationship was established: Thoracic BMD = 0.85 * Lumbar BMD + 33.5.
• Adjusted thoracic cut-off values for low BMD were determined as <102 mg/cm³ and >136 mg/cm³.

Conclusions:

• Thoracic QCT can be utilized for opportunistic osteoporosis screening.
• New thoracic BMD cut-off values facilitate the detection of low bone density.
• Increased utilization of CT scans can improve osteoporosis diagnosis rates.