Edinburgh Imaging

ACCESS quick notes for participants

Notes & hints to help you with scan reading for the ACCESS study.

ACCESS. Acute Cerebral CT Evaluation in Stroke Study

Optimize your viewing environment

  • Ensure the lights in your room are switched off or are very dim
  • Use a SMPTE test image to optimize your computer screen
    • Adjust the screen brightness & contrast so that you can see BOTH the 0% / 5% box AND the 95% / 100% box
    • If you cannot see BOTH the boxes, you should use a different computer screen

Change image / text size

  • Increase image / text size using  "ctrl+" on your keyboard
  • Decrease image / text size using "ctrl-" on your keyboard
  • The horizontal bar separating images from questionnaire can be moved up & down with your mouse so that you can see more or less of the panels
  • F11 increases overall screen size by hiding navigation bars; toggling F11 again brings them back


  • "Joblist" is where you will find your list of scans to review
  • We deliver the scans in batches of about 10 at a time
  • When you have finished one batch, the next batch will become available
  • Each scan requires answering up to 20 questions (the number varies depending on your answers)
  • When you have answered the last question (which will always be "question 20"), review your answer selection & scroll to the bottom of the screen to click "finish"


  • When you have completed scan questionnaires, you can review feedback
  • Feedback allows you to compare your answers to:
    • follow-up imaging where it's available
    • a "Gold Standard" - a single, expert Neuroradiologist who went through the questionnaire blinded to outcome & follow-up
      • the "Gold Standard" may have given answers which are not consistent with the follow-up imaging
      • this is because the "Gold Standard" readings represent real life scan reading rather than a biased retrospective assessment
    • an "expert panel" - five experts in stroke CT review
      • the "expert panel" does not always agree!
      • again, this is because the "expert panel" readings represent real life scan reading, in which there can be disagreement
    • specialty responses
      • the fractions of specialists (e.g. Neuroradiologists vs General Radiologists vs Stroke Physicians) answering a question one way or another
      • this information should allow you to compare your responses with those of similar training, & with those who have different backgrounds

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