1 What is a digital image? A digital image is an image discretized in spatial coordinates and in brightness. It can be represented by a multidimensional array of integers. 2 What is the difference between a pixel and a voxel?…
1 What is molecular imaging? Molecular imaging is the visualization, characterization, and measurement of biologic processes at the molecular and cellular levels in humans and other living systems. It is essentially a noninvasive means to study in vivo biochemistry and…
Ultrasonography (US) 1 What is ultrasonography (US), and how does it work? US is a structural imaging technique that uses high-frequency mechanical ultrasound waves (with frequencies greater than audible sound waves) to create real-time tomographic (cross-sectional) images. A hand-held transducer…
Radiography 1 What is radiography? Radiography is an imaging technique that uses x-rays to create projectional (2D) images of a region of interest in the body. It is performed by shining x-rays on a film or other image detector with…