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Abbreviation for:
range of interest
reactive oxygen intermediate
return on investment
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


(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
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
* First, it does not have the flexibility for an arbitrary scaling value to define the relative importance of the ROI and the BG wavelet coefficients.
* Second, this method requires decoding of all ROI coefficients before accessing bitplanes of the background and uses large shifting values that significantly increase the number of total bi-planes to encode.
* Fourth, as all ROI bitplanes are higher than all BG bitplanes, the scaling value rapidly increase the risk of bit-stream overflow.
Region of interest (ROI) coding techniques are particularly suitable for medical imaging.
Because of the limitations of two standard ROI coding algorithms, some improved methods for ROI coding were proposed.
The partial significant bitplanes shift (PSBShift) method proposed by [10] shifts part of the most significant of ROI coefficients instead of shifting the whole bitplanes as the standard methods do.
For example, if sampling is used to determine workload levels, the ROI calculation should explain how the sampling was conducted and what tasks were observed and counted.
To prepare for the ROI calculation, it is essential to have a complete listing of all the costs associated with the project.
For an ROI calculation, this focuses on the financial benefits.
However, they may influence the decision to make the investment and, thus, should be included in the overall ROI presentation.
Another important element in any ROI calculation is the definition of those risks that can alter the outcome of the investment.
The above steps will provide a structured framework for the presentation of the ROI calculation.