Retrospective evaluation of mandibular third molars using simulated low-dose cone-beam computed tomography: A...

Area of Science:

• Medical Imaging
• Radiology
• Dental Imaging

Background:

• Cone-beam computed tomography (CBCT) is crucial in dentistry.
• Reducing radiation dose in CBCT is a significant clinical goal.
• Simulating low-dose CBCT images can aid in protocol optimization without patient exposure.

Purpose of the Study:

• To establish a procedure for simulating low-dose CBCT scans using ImageJ.
• To evaluate the diagnostic accuracy of simulated low-dose CBCT images compared to clinical low-dose CBCT scans.
• To assess the feasibility of using sinogram data manipulation for radiation-free image simulation.

Main Methods:

• CBCT scans acquired at 5 mA were manipulated using ImageJ to simulate 2 mA settings by adding noise to sinogram data.
• Reconstructed images were compared to original clinical 2 mA CBCT scans.
• Four observers assessed image quality using a ranking scale, with statistical analysis via Wilcoxon signed-rank test and Cohen kappa for intra-observer agreement.

Main Results:

• No significant differences in image quality were found between simulated and clinical low-dose CBCT scans.
• Acceptable intra-observer agreement was achieved, with high agreement in 5 comparisons.
• The evaluation focused on the diagnostic accuracy for mandibular third molars.

Conclusions:

• ImageJ can effectively generate simulated low-dose CBCT scans.
• Simulated low-dose CBCT images demonstrate comparable diagnostic quality to clinical low-dose scans.
• Sinogram data manipulation presents a promising radiation-free method for simulating low-dose CBCT images, aiding in optimization efforts.