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Adaptive spatial filtering technique for storage phosphor radiography in portable chest radiographs: parameter
S Murayama1, J Murakami, J Tanaka
1Department of Radiology, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Radiation Medicine
|February 3, 1999
Summary
Optimizing adaptive spatial filtering (ASF) for portable chest X-rays involves setting the weighting factor curve starting point. This ensures accurate pulmonary density evaluation and adequate mediastinal enhancement in digital radiography.
Area of Science:
- Radiologic imaging
- Digital radiography
- Image processing
Background:
- Storage phosphor radiography is widely used for portable chest imaging.
- Adaptive spatial filtering (ASF) is a technique to enhance image quality.
- Optimization of ASF parameters is crucial for accurate interpretation of portable chest radiographs.
Purpose of the Study:
- To determine the optimal parameters for adaptive spatial filtering (ASF) in processing portable chest radiographs.
- To evaluate the impact of different weighting factor curves on image density and lesion visibility.
Main Methods:
- Two types of weighting factor curves (Type B and Type C) were tested for ASF optimization.
- Pixel values (PV) of pulmonary and retrocardiac areas were measured on original and processed images.
- Radiologists compared processed and unprocessed portable chest radiographs for lesion detection.
Main Results:
- Type B showed no significant change in pulmonary densities, while Type C increased lower pulmonary densities.
- Retrocardiac areas were more enhanced with Type C than Type B.
- Pulmonary densities were unchanged in 90% of Type B images, and mediastinal densities were adequate in 80% of Type B and 90% of Type C images.
Conclusions:
- The optimal starting point for the ASF weighting factor curve in portable chest radiographs should match that used for upright posteroanterior views with high kVp.
- This parameter setting ensures reliable assessment of pulmonary and mediastinal densities.