Shortcomings of low-cost imaging systems for viewing computed radiographs

Objective: To assess potential advantages of a new PC-based viewing tool fe aturing image post-processing for viewing computed radiographs on low-cost hardware (PC) with a common display card and color monitor, and to evaluate the effect of using color versus monochrome monitors. Materials and Methods: Computed radiographs of a statistical phantom were v iewed on a PC, with and without post-processing (spatial frequency and cont rast processing), employing a monochrome or a color monitor. Findings were compared with the viewing on a radiological Workstation and evaluated with ROC analysis. Results: Image post-processing improved the perception of low-contrast deta ils significantly irrespective of the monitor used. No significant differen ce in Perception was observed between monochrome and color monitors. The re view at the radiological Workstation was superior to the review done using the PC with image processing. Conclusion: Lower quality hardware (graphic card and monitor) used in low c ost PCs negatively affects perception of low-contrast details in computed r adiographs. In this situation, it is highly recommended to use spatial freq uency and contrast processing. No significant quality gain has been observe d for the high-end monochrome monitor compared to the color display. Howeve r, the color monitor was affected stronger by high ambient illumination. (C ) 2000 Elsevier Science Ltd. All rights reserved.