Table 2 Hounsfield unit (HU) values of the Contrast phantom measured from CBCT M, N1 ms-CBCT, ms-CBCT, and clinical MDCT.

From: Volumetric computed tomography with carbon nanotube X-ray source array for improved image quality and accuracy

 

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

  
  1. 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 kVp39,43 rather than the 90 kVp used in this study.
  2. 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.
Back to article page