Table 1 Exposure parameters of the 3 scanners used in this study.

From: Low-cost dual-energy CBCT by spectral filtration of a dual focal spot X-ray source

 

DE-CBCT

CBCT-1

CBCT-N

LE

HE

Tube voltage (kVp)

110

110

110

110

Filtration

0.15 mm Ta

0.5 mm Sn

0.3 mm Cu

6 mm Al

Mean energy (keV)

60.4

75.9

62.2

56.7

Tube current(mA)

15

15

11

5

Δtexp (ms)

5.0

5.0

5.0

6.5

Number of projections

360

360

360

 

Total exposure (mGy)

2.37

1.42

3.94

3.78

DAP (mGy × cm2)

309.6

185.7

517

1090

HVL (mm Al)*

8.5

10.8

8.2

5.8

Field of view

187 mm (w) × 70 mm (h)

187 mm (w) × 70 mm (h)

180 mm (w) × 160 mm (h)

  1. The HVL values for the DE-CBCT and CBCT-1 were experimentally measured. The value for CBCT-N was calculated using the x-ray tube voltage and the reported total filtration.