Initial quality performance results using a phantom to simulate chest computed radiography.

Area of Science:

• Medical Physics
• Radiologic Technology
• Imaging Science

Background:

• Quantitative quality control is essential for diagnostic imaging accuracy in chest computed radiography (CR).
• Developing cost-effective and reproducible phantoms is crucial for routine quality assurance in radiology departments.
• Simulating human tissue attenuation and scatter properties is key for realistic phantom design.

Purpose of the Study:

• To develop a homemade phantom for quantitative quality control in chest computed radiography (CR).
• To evaluate the phantom's effectiveness in determining optimal X-ray parameters for image quality.
• To assess the correlation between phantom measurements and subjective image quality assessments.

Main Methods:

• Constructed a phantom using copper, aluminum, PMMA, and Styrofoam to simulate lung, heart, and mediastinum.
• Measured Contrast-to-Noise Ratio (CNR) using a copper test object under various clinical X-ray tube potentials (110-120 kVp).
• Performed subjective contrast-detail studies using the Leeds TOR CDR test object under similar exposure conditions.

Main Results:

• The homemade phantom successfully simulated relevant anatomical regions for quality control.
• Contrast-to-Noise Ratio (CNR) was highest within the 90-100 kVp range for chest radiography.
• CNR measurements correlated well with subjective contrast-detail observations, validating the phantom's utility.

Conclusions:

• The developed homemade phantom is a simple and effective tool for quantitative quality control in chest CR.
• Optimal X-ray tube potentials for chest radiography were identified based on maximizing CNR.
• The phantom's design facilitates easy implementation into clinical quality control programs, potentially improving diagnostic image quality.