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1. a means or agent by which certain substances or structures can be identified or followed, as a radioactive tracer.
2. a mechanical device by which the outline of an object or the direction and extent of movement of a part may be graphically recorded; see also tracing.
3. a dissecting instrument for isolating vessels and nerves.
radioactive tracer a radioactive isotope replacing a stable chemical element in a compound (said to be radiolabeled) and so able to be followed or tracked through one or more reactions or systems by means of a radiation detector; used especially for such a compound that is introduced into the body for study of the compound's metabolism, distribution, and passage through the body.


A radionuclide or radiolabeled chemical; a radioactive tracer.


/ra·dio·tra·cer/ (-tra´ser) radioactive tracer.


a radioactive tracer.
References in periodicals archive ?
An elongated peripherally localized pattern of radiotracer progression is seen in large bowel GIB (Figure 1).
Dedicated to the development of novel imaging radiotracers for oncology, IMAkinib aims to find diagnostic solutions that will help select treatments best suited to individual patients, and monitor the treatment's efficacy thereafter.
123]I]CLINDE as a potent SPECT radiotracer to assess the degree of astroglia activation in cuprizone-induced neuroinflammation," European Journal of Nuclear Medicine and Molecular Imaging, vol.
Nuclear medicine uses radiotracers with known biological properties in order to outline an image of a physiological process of the organism.
Modern PET protocols can be sensitive diagnostic tools, but the physiological accumulation of radiotracer in nonmalignant tissue can complicate interpretation.
The radiotracer, developed by Avid Radiopharmaceuticals and currently under Food and Drug Administration review, enables clinicians to visualize on a PET scan deposits of beta-amyloid plaques in the brain--a hallmark feature of the illness.
After injection, patients are required to wait 60 minutes in a quiet room to allow the radiotracer to circulate.
There is no need for a second injection of radiotracer, which endangers the life of the patient--and costs lots of wasted money, including money for misdiagnosis errors.
The SUV represents the activity of the radiotracer in a topographic region of the body image or volume of interest normalised to the weight of the patient and to the quantity of radiotracer administered, hence the formula: SUV = radiotracer activity x weight of the patient/injected dose, which characterises the relative concentration of the radiotracer in the lesion of interest.
After 10 minutes of quiet rest in bed, the patients arose quickly and, at the same time, the radiotracer injected intravenously.
The Dilon 6800 Gamma Camera is a high-resolution, compact gamma camera, optimized to perform Breast-Specific Gamma Imaging (BSGI), a molecular breast imaging procedure that images the metabolic activity of breast lesions through radiotracer uptake.
The test involves injecting a very small dose of a radioactive chemical, called a radiotracer, into the vein of a patient's arm.