An<unk>  is a biologic feature, or<unk>  detectable in an image. In medicine, an<unk>  is a feature of an image relevant to a patient's diagnosis. For example, a number of<unk> s are frequently used to determine risk of lung cancer. First, a simple lesion in the lung detected by X-ray, CT, or MRI can lead to the suspicion of a neoplasm. The lesion itself serves as a<unk> , but the minute details of the lesion serve as<unk> s as well, and can collectively be used to assess the risk of neoplasm. Some of the<unk> s used in lung nodule assessment include size, spiculation, calcification, cavitation, location within the lung, rate of growth, and rate of metabolism. Each piece of information from the image represents a probability. Spiculation increases the probability of the lesion being cancer. A slow rate of growth indicates benignity. These variables can be added to the patient's history, physical exam, laboratory tests, and pathology to reach a proposed diagnosis.<unk> s can be measured using several techniques, such as CT, electroencephalography, magnetoencephalography, and MRI.
Imaging biomarker
Biomarker
Biomarker 
PET radiotracer
Radiomics
Molecular imaging
Disease diffusion mapping
Tumor marker