Feasibility of Latest-Generation Cone-Beam CT for Thoracic Imaging: A Pilot Study

Area of Science:

• Medical Imaging
• Radiology
• Oncology

Background:

• Lung cancer is a leading cause of cancer death globally.
• Low-dose computed tomography (LDCT) is standard for screening but involves radiation concerns.
• Cone-Beam Computed Tomography (CBCT) offers ultra-low-dose imaging but lacks thoracic screening data.

Purpose of the Study:

• To assess the feasibility of using a new CBCT system for lung cancer screening.
• To evaluate CBCT's effectiveness in thoracic imaging for early cancer detection.

Main Methods:

• Retrospective analysis of 88 patients (smokers) undergoing thoracic CBCT (standard vs. low-dose protocols).
• Radiologists assessed image quality and pulmonary findings independently.
• Radiation doses were compared between protocols; statistical analysis included interobserver agreement.

Main Results:

• Low-dose CBCT achieved a 2.5-fold radiation reduction (42.8 vs. 107.7 mGy·cm, p<0.001).
• Image quality (85% good/excellent) and diagnostic confidence (82%) were comparable between groups.
• Nodule detection occurred in 41% of patients, with substantial interobserver agreement (κ = 0.73-0.83).

Conclusions:

• Low-dose CBCT significantly reduces radiation exposure in thoracic imaging.
• Diagnostic confidence and interobserver reliability are maintained with low-dose CBCT.
• CBCT shows potential as a cost-effective alternative for lung cancer screening programs, warranting further prospective LDCT comparison.