. 2023 Oct 7;2:71. doi: 10.1038/s44172-023-00123-x

Table 2.

Hounsfield unit (HU) values of the Contrast phantom measured from CBCT M, N1 ms-CBCT, ms-CBCT, and clinical MDCT.

	CBCT M	N1 ms-CBCT	ms-CBCT	MDCT	Nominal value
	HU	HU	HU	HU	HU
Acrylic	$160.2 \pm 42.3$	$66.7 \pm 44.0$	$87.5 \pm 41.2$	$123.8 \pm 27.1$	$120$
Air	$- 867.6 \pm 44.1$	$- 849.7 \pm 30.2$	$- 973.6 \pm 19.2$	$- 1023.3 \pm 0.9$	$- 1000$
Macor	$1744.2 \pm 70.5$	$1583.3 \pm 82.9$	$2105.2 \pm 79.8$	$2423.3 \pm 42.1$
LDPE	$- 25.8 \pm 44.5$	$- 103.3 \pm 41.5$	$- 126.3 \pm 34.1$	$- 119.6 \pm 22.0$	$- 95$
Water	$87.7 \pm 44.0$	$- 27.6 \pm 55.5$	$- 11.5 \pm 47.7$	$15.4 \pm 24.7$	$0$
RMSE	316	385	145

Note: (1) Macor is a machinable glass ceramic composed of ~55% fluorophlogopite mica and 45% borosilicate glass. (2) The nominal values are provided by the standard CT ACR 464 phantom which is suggested for 120–130 kVp^39,43 rather than the 90 kVp used in this study.

CBCT cone beam computed tomography, ms-CBCT multisource cone beam computed tomography, MDCT multidetector computed tomography, LDPE low-density polyethylene, RMSE root-mean-square error.