Computerized Axial Tomography, CAT, or Computed Tomography, CT Terms +
(a radiographic technique that produces an image of a detailed cross section of bodily tissue using a narrow collimated beam of x-rays that rotates in a full arc around a patient to image the body in cross-sectional slices)
The abdomen is separated anatomically from the chest by the diaphragm, the powerful muscle spanning the body cavity below the lungs.
In referring to a growth, abnormal may mean that it is cancerous or premalignant; that is, likely to become cancer.
An unwanted effect caused by the administration of a drug. The onset of the adverse reaction may be sudden or develop over time.
2. The body system of defense against foreign invaders, particularly pathogens (the agents of infection).
The allergic reaction is misguided in that these foreign substances are usually harmless. The substances that trigger allergy are called allergen. Examples include pollens, dust mite, molds, danders, and certain foods.
People who are prone to allergies are said to be allergic or atopic.
Gross anatomy involves structures that can be seen with the naked eye and is the opposite of microscopic anatomy, or histology, which involves structures seen under the microscope.
Traditionally, both gross and microscopic anatomy are studied in the first year of medical school in the U.S. The most celebrated textbook of anatomy in the English-speaking world is >Gray's Anatomy, which is still a useful reference book.
The word "anatomy" comes from the Greek ana- meaning "up" or "through" + tome meaning "a cutting".
Anatomy was once a "cutting up" because the structure of the body was originally learned through dissecting it; that is, "cutting it up".
Antihistamines do not stop the formation of histamine; therefore, antihistamines do not stop the allergic reaction but protect tissues from some of its effects.
Antihistamines frequently cause mouth dryness and sleepiness. Newer "non sedating" antihistamines are generally thought to be somewhat less effective.
Antihistamine side effects that occasionally occur include urine retention in males and fast heart rate.
The blood is transported throughout the body by the circulatory system.
Blood functions in two directions: arterial and venous. Arterial blood is the means by which oxygen and nutrients are transported to body tissues while venous blood is the means by which carbon dioxide and metabolic by-products are transported to the lungs and kidneys, respectively, for removal from the body.
Bone also serves as a storage area for calcium, playing a large role in calcium balance in the blood.
The computerized axial tomography (CAT) scan can reveal some soft-tissue and other structures that cannot even be seen in conventional X-rays.
Using the same dosage of radiation as that of an ordinary X-ray machine, an entire slice of the body can be made visible with about 100 times more clarity with the CAT scan.
The "cuts" (tomograms) for the CAT scan are usually made five or ten millimeters (mm) apart. The CAT machine rotates 180 degrees around the patient's body; hence, the term "axial".
The machine sends out a thin X-ray beam at 160 different points. Crystals positioned at the opposite points of the beam pick up and record the absorption rates of the varying thicknesses of tissue and bone. The data are then relayed to a computer that turns the information into a 2-dimensional cross-sectional image.
CAT scanning was invented in 1972 by the British engineer Godfrey N. Hounsfield (later Sir Godfrey) and the South African (later American) physicist Alan Cormack.
CAT scanning was already in general use by 1979, the year Hounsfield and Cormack were awarded the Nobel Prize in Medicine or Physiology for its development.
The chest contains the lungs, the heart, and part of the aorta.
The walls of the chest are supported by the dorsal vertebrae, the ribs, and the sternum.
- An unhealthy state; such as, in "this is a progressive condition".
- A state of fitness; such as, "getting into condition".
- Something which is essential to the occurrence of something else; essentially, a "precondition".
- As a verb: to cause a change in something so that a response that was previously associated with a certain stimulus becomes associated with another stimulus; to condition a person, as in behavioral conditioning.