Quality and Image Processing Analysis versus Radiation Dose in Hip Radiographic Examinations

Aims: Evaluate the quality and processing of images in hip radiographic examinations.

Study Design: Six combinations of exposure techniques commonly used in clinical practice were used, keeping the voltage (kVp) value constant, varying only the current and time relationship (mA.s).

Place and Duration of Study: The study was carried out at the Radiodiagnosis Laboratory of the Radiology and Medical Physics graduation courses at the Franciscan University (UFN), as part of the research developed during the Image Processing course in the second semester of 2023.

Methodology: Image acquisition and radiation dose measurement were performed using clinical radiographic equipment and a model resembling hip anatomy, along with a dosimetric system to quantify radiation dose at the entrance surface (ESAK). The captured images were digitized through a computerized radiography (CR) system, enabling quantitative analysis using histograms and Regions of Interest (ROI) in anatomical structures relevant for diagnosis. Signal and noise values were evaluated, allowing the determination of the signal-to-noise ratio (SNR) and radiographic contrast (CR).

Results: The results revealed significant differences among the various techniques employed. Some images displayed lower SNR, ranging from 8.14% to 15.60%, yet with higher CR, varying between 5.48% and 22.29%. Remarkably, one technique (70 kVp with 16 mA.s) demonstrated the best cost-benefit relationship, reducing radiation exposure by 48.7% (from 6.32 to 3.24 mGy) with minimal reduction in SNR, less than 10%, and a 5.47% increase in CR.

Conclusion: These findings highlight the importance for radiology professionals seeking imaging techniques that guarantee high diagnostic quality with minimal patient exposure. Prioritizing safer and more effective radiological practices is essential for delivering quality healthcare services.