High resolution in cancer imaging refers to the ability to distinguish and visualize fine details within tissues and organs. This is crucial for accurately identifying and characterizing tumors, assessing their size, shape, and exact location, and determining the extent of disease spread. High-resolution imaging techniques include MRI (magnetic resonance imaging), CT (computed tomography), and PET (positron emission tomography) scans, as well as advanced forms of microscopy like confocal and multiphoton microscopy.