Scan, SPECT
Single Photon Emission Computed Tomography, a nuclear medicine procedure in which a gamma camera rotates around the patient and takes pictures from many angles, which a computer then uses to form a tomographic (cross-sectional) image.
The calculation process in SPECT is similar to that in CT (X-ray computed tomography) and in PET (positron emission computed tomography).
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- Scan, thyroid
Thyroid scanning is a nuclear medicine procedure. As the thyroid gland accumulates radioactive material (usually, radioactive technetium or iodine), the gland produces an image. Thyroid scanning is used to determine how active the thyroid is in manufacturing thyroid hormone. This can determine whether inflammation of the thyroid gland (thyroiditis) is present. It can also detect […]
- Scarification
The making of many small, superficial scratches in the skin. Scarification may be done in giving a smallpox vaccination or in removing a tattoo and leaving a scar in its place.
- Scarlatina
Also called scarlet fever, a disease caused by infection with group A streptococcal bacteria that occurs in a small proportion of people with strep throat. The incubation period between contracting strep and the onset of scarlet fever is short, typically 72 hours but may range from 1 to 7 days. Illness usually begins with a […]
- Scarlet fever
A skin condition that is due to a streptococcal sore throat or any other streptococcal infection. The group A streptococcal bacteria produce a toxin that causes a scarlet rash that initially appears on the neck and chest, then spreads over the body, and lasts around 3 days. As the rash fades, desquamation (peeling) may occur […]
- Schadenfreude
Pleasure from the misfortune of others. The word entered English in 1895 from the German “Schade”, harm, + “Freude,” joy = joy (over) harm (suffered by another).