Ultra-Low Dose Computed Tomography Imaging in Quantifying Bone Trauma and Disorders: A Cross-Sectional Study.

Area of Science:

• Radiology
• Medical Imaging
• Bone Diseases

Background:

• X-ray computed tomography (CT) is crucial for diagnosing bone abnormalities.
• CT dose optimization is vital due to potential stochastic effects of X-ray radiation.
• Ultra-low-dose CT (ULD-CT) with iterative reconstruction (IR) is explored for bone imaging efficacy.

Purpose of the Study:

• To evaluate the effectiveness of ULD-CT reconstructed with IR for detecting bone trauma and disorders.
• To compare ULD-CT with standard-dose CT (SD-CT) in terms of image quality and diagnostic accuracy.
• To quantify the dose reduction achieved with the ULD-CT protocol.

Main Methods:

• A cross-sectional study involving 71 patients with bone CT requests.
• Comparison of standard dose (120 kVp) and ULD-CT (80 kVp) protocols.
• Image reconstruction using standard and IR algorithms; assessment of image quality via a five-point scale; calculation of sensitivity and specificity.

Main Results:

• ULD-CT accurately identified 113 out of 118 bone trauma and disorders.
• Image quality for ULD-CT was rated as "very good", "good", or "acceptable" for both spine and extremity bones.
• Sensitivity and specificity for ULD-CT were 67%-95% and 100%, respectively, with approximately 98% dose reduction.

Conclusions:

• ULD-CT with IR significantly reduces radiation dose while maintaining acceptable image quality for bone imaging.
• The ULD-CT protocol is suitable for diagnosing bone trauma and disorders.
• Further tuning of ULD-CT protocols may enhance its future clinical utility.