Understanding Quantitative Computed Tomography (QCT) for Bone Density Testing

Sept. 3, 2024

Quantitative Computed Tomography (QCT) is a specialized bone density test that uses a CT scanner to evaluate the strength of your bones and assess your risk of osteoporosis. Unlike other bone density tests, QCT produces a 3D image, allowing for a more detailed measurement of Bone Mineral Density (BMD). The hip and lumbar spine are typically the primary areas evaluated with QCT, offering valuable insights into your bone health.

Who Should Consider a QCT Bone Density Scan?

A QCT Bone Density Scan is particularly recommended for individuals who may have specific risk factors, including:

  • Those at risk of osteopenia (low bone mass)

  • Patients currently being treated for osteoporosis and requiring regular monitoring

  • Individuals receiving or about to receive steroid therapy

  • Patients with hyperparathyroidism

  • Those with vertebral abnormalities

  • Individuals with either a small or tall stature

  • Patients with a large body habitus

  • Men with degenerative spine disease

Advantages of QCT Over DXA Testing

QCT offers several advantages over Dual-Energy X-ray Absorptiometry (DXA) testing, especially for individuals who may not be suitable candidates for DXA. QCT scans are safe and provide accurate BMD measurements for patients who have:

  • Arthritis

  • Scoliosis

  • Disc space narrowing

  • Spinal degenerative diseases

  • Aortic calcification

  • Osteophytes

  • Obesity

Contraindications for QCT Bone Density Scans

While QCT is generally safe, it is not recommended for everyone. You should avoid a QCT scan if you:

  • Have recently undergone a test involving barium, iodine, or other contrast materials

  • Are pregnant or suspect you may be pregnant

Preparing for Your QCT Bone Density Scan

Before your QCT scan, you may need to:

  • Avoid calcium supplements for at least 24 hours before the test

  • Wear loose, comfortable clothing and avoid metal zippers, buttons, or accessories

  • Inform your healthcare provider if you’ve recently had any exams involving contrast materials, as these could interfere with your scan results

What to Expect During the QCT Scan

During the scan, you will lie on a cushioned table while the CT scanner captures images of your bones, focusing on areas like the spine and hips. The procedure is quick, non-invasive, and typically takes between 10 to 30 minutes. It’s important to remain still during the scan to ensure accurate results.

Understanding Your QCT Scan Results

Your QCT scan results will provide detailed information about your bone mineral density, which is essential for assessing your risk of fractures and determining the need for osteoporosis treatment. The results will include a BMD score that helps your healthcare provider make informed decisions about your bone health.

If you have any questions or concerns about a QCT bone density test, please don’t hesitate to contact us.

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