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. Author manuscript; available in PMC: 2017 Jun 1.
Published in final edited form as: Ultrasound Med Biol. 2016 Mar 3;42(6):1251–1262. doi: 10.1016/j.ultrasmedbio.2016.01.004

Table 2.

Description of IOS scores for ARFI imaging ROS*

IOS score ARFI imaging ROS characteristics
Boundary Contrast Texture Location
1 Variable Low Variable Peripheral zone or central gland
2 Variable Medium Smooth Peripheral zone
3 Well defined High Smooth Peripheral zone

ARFI = acoustic radiation force impulse; IOS = index of suspicion; ROS = regions of suspicion.

*

Note that the healthy central gland exhibits heterogeneity in ARFI images that can confound the ability to identify ROS and, therefore, reduces this IOS in this scoring scheme.