|eDQE | Clinic. Optimiz. of CT | Medical Image Display | Tech. Optimiz. of Digital Mammo|
|Quant. Image | Emerg. Quant. Imaging | Perf. Metrology | Clinical Trials | Emerg. Clinical
Assessment of digital radiographic detectors and systems using eDQE
RAI Labs is one of a small, but growing, cadre of international research groups with a long-standing focus in image quality metrics of digital radiography systems. As a group, we have made significant contributions to the advancement of image metrology through our critical evaluation of existing metrics and standard methodologies; development and validation of new metrics; and active participation in various national and international initiatives aimed at establishing standardized image quality methodologies for evaluating these systems.
An example of our contributions to the advancement of digital radiography imaging metrology is our newly introduced performance metric, effective detective quantum efficiency (eDQE). Unlike conventional DQE evaluations which are performed under ideal conditions to capture the intrinsic performance of the detection system independent of application, eDQE evaluations are intended to reflect clinical conditions which include the effects of magnification, focal spot blurring, scatter from the patient, and effects of the anti-scatter device. Our work validating this new metric was focused on the digital chest radiography application where we established that, in comparison to the eDQE, the conventional metric, DQE, fell short of reflecting the system performance under typical clinical conditions revealing its limitations in predicting the relative performance of these systems in the clinic. More recent work is focused on the application of the eDQE methodology to mammography.
Comparing the computation of DQE and eDQE metrics.
In addition to our ongoing research in image quality metrology, various members of RAI Labs serve in leadership roles within the AAPM to improve image quality metrology and assessment. The AAPM Task Group 162, chaired by Ehsan Samei, is developing a suite of software tools for evaluating the MTF, NPS and DQE/eDQE of radiographic systems. Prototype software has been developed within RAI Labs and beta testing is currently underway. The AAPM Task Group 150, with co-chair Nicole Ranger and member Ehsan Samei, is developing guidelines and recommendations for acceptance testing of digital radiography imaging systems. The AAPM Task Group 171, with Ehsan Samei, Joseph Lo and James Dobbins as members, is developing guidelines for acceptance testing of digital tomosynthesis systems.