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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
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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 ?
Calculating ROI of a synchronous replication solution is difficult since, if a disaster never happens and the replicated copy is never used, then no value is ever realized--reducing the replication solution to "insurance.
ROI benefit: Financial planning is more detailed, resulting in greater profitability due to increased understanding of an organization's financial health.
Once a record is established of these items and their value is defined, subtract the money spent on training from the value of the improvements in this area for your ROI.
Measuring ROI in Coaching for New-Hire Employee Retention: A Global Media Company (Lisa Ann Edwards and Christina Lounsberry).
The worldwide leader in online professional education, Villanova University now offers career-building certificates in nine of today's in- demand knowledge areas: Project Management, Six Sigma, Contract Management, IS Security, Business Analysis, Software Testing, Human Resources, Phillips ROI Methodology(TM) and Leadership.
Clearly, measuring ROI is one of the most critical challenges facing the public relations profession.
Most vendors use industry-standard statistics as assumptions (such as the average cost of a component or manpower resource) to determine ROI.
Important stumbling blocks that prevent organizations from seeing an ROI with their BPM projects
Whether you're using a traditional laser bar code system, a camera system or the latest in RFID, the ROI Calculator provides a fast, accurate analysis of the pay back period for your system," said Adnan Ahmed, Accu-Sort vice president of marketing.
As companies and their products are added to the ROI family, their web presence will be incorporated into the network to capitalize on the ROI strategy, which includes search engine optimization (SEO), greater infrastructure and bandwidth.
Echopass customers are reporting significant ROI on their call center investment, often less than 90 days, after deploying Echopass Call and Contact Center On Demand solutions.
We've seen what Donat/Wald has done for so many major online brands - all with an approach that delivers positive ROI on every dollar spent.