### activity | examination | scan:

Bone scan
* are also accurate for finding lesions for biopsy or excision
  - an adjunct procedure for helping in the diagnosis
  - more sensitive than radiographs and provide a survey of the entire skeleton
  - nonspecific and often reveal abnormalities on the normal side
* are often helpful when tumor or infection is possible
  - more sensitive than x-rays in diagnosing infections, tumors, and fractures
* are useful for diagnosing conditions such as infections, tumors, and arthritis
  - in detecting osteomyelitis, stress fractures, and metastases to bone
* can demonstrate the functioning of bone tissue
  - detect and localize early disease
* detect changes in function before structural changes occur.
* enable the doctor to determine exactly where osteonecrosis is occurring within the body.
* help determine multiple bone involvement.
* require the use of very small amounts of radiation.
* shows abnormal uptake in colon.
* using radioactive tracers help determine the exact location of the tumor.
* visualizes a great deal of pathology long before roentgenographic changes are evident.

### activity | examination | scan:

Brain scan
* are certainly one of the reasons for the success of neurology
  - medical procedures
* help to increase certainty of brain death, but the diagnosis is primarily clinical.
* reveal different activity levels when the memory was false and when it was true.
* show abnormal biochemistry in people who are depressed
  - fewer nerve cell connections between the left and right halves of the brain
* show that obese people, just like drug addicts, have fewer receptors for dopamine
  - the brain undergoes structural changes and actually shrinks with starvation
  - two-sided memory flow
* suggest that the same areas are used for both imaging and visual perception.

Cat scan
* CAT scans are one of the major diagnostic tools in medical radiology
  - can detect pituitary tumors and then the tumor can be removed surgically
* are a helpful diagnostic tool for doctors, especially in cases of trauma and tumors.

### activity | examination | scan:

Full scan
* is useful in determining unknown compounds in a sample.
+ Gas chromatography–mass spectrometry, Analysis, Full scan MS: Mass spectrometry :: Laboratory techniques
  * Full scan is useful in determining unknown compounds in a sample. It provides more information than SIM when it comes to confirming or resolving compounds in a sample. The instrument method controls the temperature in the GC, the MS scan rate and the range of fragment sizes being detected. When a chemist is developing an instrument method, the chemist sends test solutions through the GS-MS in full scan mode. This checks the GC retention time and the mass fragment fingerprint before moving to a SIM instrument method.

Nuclear scan
* cause fetal radiation exposure.
* expose a child to no more radiation than conventional x-ray
  - the same amount of radiation as a conventional x-ray
* lack the clear definition of structure visible on an X-ray.

Retinal scan
* are the best biometric devices with no false rates.
* take the iris and blood vessels from the back of the eye to identify someone.