. 2023 Mar 27;42(3):446–456. doi: 10.14366/usg.23014

Table 2.

Mean values of the ATI, iATT, and UDFF algorithms obtained in different positions

Variable		Mean±SD
ATI (dB/cm/MHz)
	(a) Intercostal, 2 cm^a), best image (ROI size, 3 cm)	0.64±0.10
	(b) Intercostal, 2 cm^a), 90° (ROI size, 3 cm)	0.64±0.09
	(c) Intercostal, 2.5 cm^a) (ROI size, 3 cm)	0.62±0.10
	(d) Intercostal, 3.0 cm^a) (ROI size, 3 cm)	0.59±0.09
	(e) Intercostal, 2 cm^a), best image (ROI size, 5 cm)	0.60±0.09
	(f) Subcostal, 2 cm^a), best image	0.67±0.13
	(g) Left lobe, 2 cm^a), best image (n=14)	0.68±0.14
	(h) Each measurement in a different location^b)	0.65±0.10
	(i) Free breathing, intercostal^b)	0.65±0.12
iATT (dB/cm/MHz)
	Intercostal	0.63±0.10
	Subcostal	0.62±0.09
	Each measurement in a different location	0.65±0.10
	Free breathing, intercostal	0.67±0.09
UDFF (%)
	Intercostal	6.6±4.2
	Subcostal	9.1±7.4
	Each measurement in a different location	6.6±4.2
	Free breathing, intercostal	5.8±3.2

ATI, attenuation imaging; iATT, improved attenuation; UDFF, ultrasound-derived fat fraction; SD, standard deviation; ROI, region of interest.

^a)

The distance refers to the upper edge of the ROI with respect to the liver capsule.

^b)

ROI with a size of 3 cm and upper edge of the ROI at a 2 cm below the capsule, best image.