One of my students, on a photography course, wants to set a camera up to record people looking at her work. The camera will take a photo every 20 seconds, and these should appear in a 3x3 grid on a ...

Think you know your baseball? Then it's time to put your knowledge to the test. A game called Immaculate Grid has popped up, and it's a simple yet challenging conceit: Each day, you get a 3x3 grid and ...

Figure 1. Results from 3x3 grid phantom experiment with diameter of 120 mm. Top row: 3x3 grid phantom filling and components. Middle row: reconstructed A (triple coincidences highest energy photon ≥ ...