The first image displays a presentation slide with a title that reads 'CT Scan Sensitivity for SAH'. Below the title, there are four bullet points with percentages and time durations. The first bullet point shows '99.9% at 0-12 hours', the second '80% at 3 days', the third '60% at 1 week', and the fourth '30% at 2 weeks'. The image also includes a human brain illustration with a red and white color scheme, and a text box at the bottom that reads 'Depends on generation of scanner and who's reading scan and how much blood there is there