Two K versus 4 K storage phosphor chest radiography: detection performance and image quality

Area of Science:

• Radiology
• Medical Imaging
• Diagnostic Imaging

Background:

• Digital storage phosphor (DSP) imaging is widely used for chest radiography.
• Matrix size is a critical parameter influencing digital image resolution and quality.

Purpose of the Study:

• To compare the diagnostic performance and image quality of 4-K versus 2-K matrix sizes in DSP chest radiographs.
• To determine if higher matrix size improves the detection of CT-proven thoracic abnormalities.

Main Methods:

• Retrospective analysis of 85 patients undergoing thoracic CT.
• Acquisition of two posteroanterior DSP chest radiographs per patient (4-K and 2-K matrix sizes).
• ROC analysis for abnormality detection and subjective quality assessment by radiologists.

Main Results:

• No significant difference in the detection of mediastinal, pleural, or pulmonary abnormalities between 4-K and 2-K images.
• Subjective image quality ratings and landmark demarcation showed no significant differences between the two matrix sizes.
• ROC analysis did not reveal superior detection performance for the 4-K matrix.

Conclusions:

• 4-K matrix size in DSP chest radiography does not offer superior image quality or detection performance compared to 2-K matrix size.
• The evaluated matrix sizes do not significantly impact the diagnostic yield for thoracic abnormalities on hard copy format.