Fig. 2.

Cone-beam computed tomography (CBCT) instrument calibration by K₂HPO₄ and data analysis by 2 different software products. A, By using a defined concentration series of K₂HPO₄ (dipotassium hydrogen phosphate) electrolyte solution calibration was attained. The solutions were used in the range of 50 mg/mL to 1000 mg/mL K₂HPO₄, yielding corresponding Hounsfield unit (HU) values; control reference values were obtained using air and water. The representative CBCT images of these radiographs illustrate the corresponding grey value levels. B, CBCT analysis of the calibration solutions of K₂HPO₄ was performed by using 2 different software products: blue line = Planmeca Promax 3D (Planmeca Oy) and red line = Simplant 16 (Densply). These 2 analytical tools, based on product specific reconstruction algorithms, delivered identical results, thus providing a basis for data comparison irrespective of the equipment used.