Article Figures & Data
Figures
- Fig 1.
Sample single-image sequence pair acquired under DSA exposures. The average RP air kerma per frame for DSA was calculated to be 1.40 mGy for the FPD mode and 1.34 mGy for the HiDef mode. Due to more quanta reaching the detector, the image quality is improved for both the FPD and HiDef modes compared with On-line Fig 4 and On-line Fig 5. The amount of information available in the HiDef native image is higher than in the FPD native image. For the reader to appreciate the difference between HiDef and FPD images, especially the visualization of the stent, the native images are zoomed-in to the ROI showing the stent area.
- Fig 2.
Histogram distribution of rater-assigned scores (raters A and B) for all 5 aneurysm geometries, A, The first criterion: overall image preference in terms of visualization of anatomic features and image noise. B, The second criterion: visual quality of the stent for all 3 exposure modes: fluoroscopy (Fluoro), DA, and DSA. The raters were asked to score their image preference as either similar (∼), better (>), much better (≫), or substantially better (≫>) than the other image.
- Fig 3.
Distribution of detector preference scores for 60 image sequence pairs (all 5 aneurysm geometries) for both criteria. On the basis of the rater-assigned scores (Fig 2), the detector from which the selected image was acquired was recorded as the preferred detector.
Tables
Criteria Rater-Assigned Scores Intrarater Agreement 1-Sample T Test Rater 1 Rater 2 Rater 1 P Value Rater 2 P Value P(agr) 95% LC 95% UC P(agr) 95% LC 95% UC C1 .7 0.50 0.85 .83 0.65 0.94 <.001 <.001 C2 .56 0.37 0.75 .83 0.65 0.94 <.001 <.001 Note:—P(agr) indicates probability of agreement; LC, lower confidence; UC, upper confidence; C1, overall image preference in terms of visualization of anatomic features and image noise; C2, the visual quality of stent.
↵a One-sample t test for analysis of the scores.
Criteria Detector-Preference Scores Interrater Agreement 1-Sample T Test P(agr) 95% LC 95% UC Rater 1 P Value Rater 2 P Value C1 .96 0.82 0.99 <.001 <.001 C2 .9 0.73 0.97 <.001 <.001 Note:—P(agr) indicates probability of agreement; LC, lower confidence; UC, upper confidence; C1, overall image preference in terms of visualization of anatomic features and image noise; C2, the visual quality of stent.
↵a One-sample t test for analysis of the scores.
