(redirected from Rois)
Also found in: Dictionary, Thesaurus, Financial, Acronyms, Encyclopedia, Wikipedia.

region of interest (ROI)

an area on a digital image that circumscribes a desired anatomical location. Image processing systems permit drawing of ROIs on images. The average parametric value is computed for all pixels within the ROI and returned to the operator.


Abbreviation for:
range of interest
reactive oxygen intermediate
return on investment


(re'jon) [L. regio, boundary]
A portion of the body with natural or arbitrary boundaries. Synonym: regioregional (-al), adjective
Enlarge picture

abdominal regions

The abdomen and its external surface, divided into nine regions by four imaginary planes: two horizontal, one at the level of the ninth costal cartilage (or the lowest point of the costal arch) and the other at the level of the highest point of the iliac crest; two vertical, through the centers of the inguinal ligaments (or through the nipples or through the centers of the clavicles) or curved and coinciding with the lateral borders of the two abdominal rectus muscles.
See: illustration

chest region

Any of the three areas of the chest: anterior, posterior, and lateral. The anterior divisions (right and left) are the clavicular, infraclavicular, and supraclavicular, the mammary and inframammary, and the upper and lower sternal. The posterior divisions (right and left) are the scapular, infrascapular, interscapular, and suprascapular. The lateral divisions are the axillary and infra-axillary.

hypochondriac region


hypogastric region


iliac region

The inguinal region on either side of the hypogastrium.

inguinal region


lumbar region

That area of the abdominal surface lateral to the umbilical region, above the iliac region, and below the hypochondriac region.

region of interest

Abbreviation: ROI
In radiology, the object of a study or a treatment designed to affect a limited part of the body.

parasternal region

The area between the sternal border and parasternal line.

sternomastoid region

The wide area on the lateral region of the neck covered by sternocleidomastoid muscle.

region of interest

Abbreviation: ROI
In radiology, the object of a study or a treatment designed to affect a limited part of the body.
See also: region
References in periodicals archive ?
If your supplier or any other trading partner does not see a positive ROI from B2B, the supply chain changes intended will not stick.
Using a simple model for ROI, we were able to justify purchasing eBizness Transact and were able to keep it within the scope of our near-term budget period," said Matt Sidden, manager of electronic commerce, ECMD, an IPNet customer.
MANAGE 2000 is a registered trademark of ROI Systems, Inc.
ROI Systems' experienced team of implementers and business process improvement experts complete the entire implementation and provide ongoing service for all business partner clients, rather than simply assisting new partners for a short period of time as is the case with most partner programs.