ROI

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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.

ROI

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

region

(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

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

Hypochondrium.

hypogastric region

Hypogastrium.

iliac region

The inguinal region on either side of the hypogastrium.

inguinal region

Groin.

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 ?
In that case, all significant bits associated with the ROI coefficients after scaling will be in higher bitplanes than all the significant bits associated with the BG coefficients.
Five major limitations of Maxshift method for ROI coding are as follows [10]-[12].
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.
The main drawback of RBDWT in the ROI coding is that the shape information of ROI must be coding, which significantly decreases the ROI coding efficiency.
Because of the limitations of two standard ROI coding algorithms, some improved methods for ROI coding were proposed.
The ROI coding system based on the GLBShift method includes three parts: integer wavelet transform (IWT), ROI mask generation and the bitplane scaling encoding based on GLBShift method.
In fact, if all coefficients in the ROI mask are losslessly encoded, the ROI can be losslessly reconstructed.
In the new ROI coding system, the wavelet transform is firstly performed, and the transformed coefficients are eventually quantized.
The new method divides all bitplanes into three parts: most significant bitplanes of ROI and BG coefficients (MB), general significant bitplanes of ROI and BG coefficients (GB), and least significant bitplanes of ROI and BG coefficients (LB).
First, these ROI bitplanes belonged to LB are up-shifted until no overlapping happens between BG and ROI bitplanes.