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Automatic Contour Detection Using a "Fixed-Point Hachimura-Kuwahara Filter" for SPECT Attenuation Correction.

K Minato, Y N Tang, G W Bennett

IEEE Transactions on Medical Imaging

|January 1, 1987

Summary

This study introduces a new method using a fixed-point Hachimura-Kuwahara filter for accurate body contour extraction in single-photon emission computed tomography (SPECT) imaging. This approach improves attenuation correction by avoiding sensitive thresholding, leading to better image quality.

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Area of Science:

Medical Imaging
Image Processing
Nuclear Medicine

Background:

Single-photon emission computed tomography (SPECT) attenuation correction typically assumes uniform attenuation, relying on body surface contour estimation.
Existing contour estimation methods often use thresholding, which is sensitive to threshold value selection and nonuniform activity distributions.

Purpose of the Study:

To develop an automatic and robust method for extracting body surface contours from SPECT images.
To improve the accuracy of attenuation correction in SPECT by overcoming limitations of threshold-based contour detection.

Main Methods:

Proposed the "fixed-point Hachimura-Kuwahara filter" for extracting contour primitives from SPECT images.
Applied the Hachimura-Kuwahara filter iteratively to obtain a fixed-point image, resulting in a piecewise constant array.

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Utilized a minimum distance connection criterion tracing algorithm on contour primitives for contour detection, eliminating the need for threshold value selection.

Main Results:

The proposed method successfully extracted contour primitives and detected a reasonable outline of a phantom.
The procedure demonstrated robustness without requiring manual threshold selection.
The fixed-point Hachimura-Kuwahara filter effectively preserved edges while smoothing non-edge regions.

Conclusions:

The fixed-point Hachimura-Kuwahara filter offers an effective, automatic method for SPECT contour extraction.
This technique enhances attenuation correction by providing a reliable body contour without sensitive thresholding.
The developed procedure shows promise for improving the accuracy and reliability of SPECT imaging.