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Optimizing kilovoltage (kV) settings for narrow detector cone-beam CT (CBCT) revealed that both low and high kV protocols provide acceptable image quality at constant radiation doses. This finding is crucial for balancing diagnostic accuracy and patient safety in CBCT imaging.

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Area of Science:

  • Radiological Imaging
  • Medical Physics
  • Cone-Beam Computed Tomography (CBCT)

Background:

  • Cone-beam computed tomography (CBCT) is widely used in dentistry and other medical fields.
  • Optimizing imaging parameters like kilovoltage (kV) is essential for achieving diagnostic image quality while minimizing radiation dose.
  • Narrow detector CBCT units require specific parameter optimization due to their unique design.

Purpose of the Study:

  • To determine the optimal kilovoltage (kV) settings for a narrow detector cone-beam CT (CBCT) unit.
  • To evaluate the impact of different kV levels on image quality across various fields of view (FOV) and dose protocols.

Main Methods:

  • Image quality was assessed using clinical (CL), quantitative (QUANT), and technical (TECH) evaluations with anthropomorphic and polymethyl methacrylate phantoms.
  • A PaX-i3D Green CBCT unit was used with large (21 × 19 cm) and medium (12 × 9 cm) FOVs, employing high-dose (HD, 85–110 kV) and low-dose (LD, 75–95 kV) protocols.
  • Radiation dose was standardized by adjusting milliamperage (mA), and statistical comparisons (bootstrapping) were used to identify significant differences in image quality parameters.

Main Results:

  • Generally, kV values within the same protocol group exhibited similar image quality (p > 0.05).
  • Specific kV values showed statistically significant differences in quality, with some higher kV settings in HD protocols and lower kV settings in LD protocols performing worse.
  • Clinical, quantitative, and technical evaluation parameters were analyzed to determine optimal kV settings.

Conclusions:

  • At a constant radiation dose, both low and high kilovoltage (kV) protocols can yield acceptable image quality for narrow-detector CBCT units.
  • The findings suggest flexibility in kV selection without compromising diagnostic utility, provided the overall radiation dose is maintained.