TO DR
The described test objects are designed for systems that operate by sensing mean signal levels. Specifically, the TO DR (Dynamic Range) is used to test dynamic range by measuring detail visibility across a broad spectrum of input X-ray intensities. Different designs are available to cater to both subtraction and non-subtraction systems. Subtraction systems typically involve comparing images taken before and after contrast agent administration, while non-subtraction systems don't rely on this comparison. The TO DR, through its dynamic range testing, allows for the evaluation of the system's ability to detect details under varying X-ray intensities, providing valuable insights into the imaging system's performance