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Computing adrenal uptakes with compact, fixed-size regions

K F Koral, H Abukhadra, M Tuscan

Computer Programs in Biomedicine

|August 1, 1982

Summary

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This study introduces a computer program for nuclear medicine imaging of the adrenal gland. The program automates region of interest selection, background subtraction, and conversion for accurate uptake determination.

Area of Science:

Medical Imaging
Nuclear Medicine
Computer Science

Background:

Accurate adrenal gland uptake determination in nuclear medicine requires precise region of interest identification, background correction, and count rate conversion.
Existing methods may lack automation and standardization, potentially leading to variability in results.

Purpose of the Study:

To present a computer program designed to meet the three key requirements for adrenal gland uptake determination in planar nuclear medicine imaging.
To offer an automated and standardized approach for analyzing adrenal gland activity.

Main Methods:

A nearest-neighbor region-growing technique is employed to define the region of interest, starting from an operator-selected center and identifying the hottest pixels.
Background counts are estimated using a 'ring' of pixels surrounding the adrenal gland to account for overlying and underlying tissue.

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Counts per second (cps) are converted to microcuries (muCi) using a calibration equation that incorporates adrenal depth, potentially determined from a lateral view.

Main Results:

The developed computer program successfully addresses the three essential steps: region of interest determination, background subtraction, and conversion to absolute uptake values.
The program offers an option for a second-level search to refine the region of interest if the initial selection is not satisfactory.
Parameters for adapting the program to different camera-collimator systems are documented.

Conclusions:

The outlined computer program provides a comprehensive solution for quantitative analysis in adrenal gland nuclear medicine imaging.
This automated approach enhances the accuracy and reproducibility of adrenal uptake measurements.
The program is available in listing form and adaptable for various imaging systems.