Appen. II Flashcards
Angiography
X-ray imaging of blood vessels. A contrast substance is injected into a blood vessel, and x-ray images are taken of the vessel.
Bone density scan/DEXA
Low-energy x-rays are used for this study, which measures bone thickness and reveals areas of bone deficiency and osteoporosis. This study is most often performed on the lower spine or hips.
Cardiac catheterization
Procedure in which a catheter (tube) is passed via vein or artery into the chambers of the heart to measure the blood flow out of the heart and the pressures and oxygen content in the heart chambers.
Contrast material is also introduced into heart chambers, and x-ray pictures are taken to show heart and heart valve structure.
Chest x-ray
An x-ray image of the chest wall, lungs, and heart. It may show infection (pneumonia or tuberculosis), emphysema, damage due to occupational exposure, lung tumors, fluid accumulation, or heart enlargement.
CT scan
X-ray images that show the body in cross-section. Contrast material may be used to highlight structures such as the liver, brain, or blood vessels, and barium can be swallowed to outline gastrointestinal organs.
Doppler ultrasound
Technique that focuses sound waves on blood vessels and measures blood flow as echoes bounce off red blood cells. Arteries or veins in the arms, neck, legs, or abdomen are examined to detect vessels that are occluded (blocked) by clots or atherosclerosis.
Echocardiogram
Imaging of the heart by introducing high-frequency sound waves through the chest into the heart. It is a highly useful diagnostic tool in the evaluation of diseases of the valves that separate the heart chambers and diseases of the heart muscle.
MRI
Magnetic Resonance Imaging
A powerful magnetic field is created surrounding the whole patient, or only the heard, and water molecules are aligned and then relaxed, generating electromagnetic currents that provide a detailed picture of organs and blood vessels.
Mammogram
X-ray recording or record of the breast. X-rays of low voltage are beamed at the breast, and images are produced.
Ultrasound
Images are produced by beaming high-frequency sound waves (not x-ray) into the body and capturing the echoes that bounce off organs. These echoes are then processed to produce an image showing the difference between fluid and solid masses and the general position of organs.
Bone scan
A radioactive substance is injected intravenously, and its uptake in bones is detected with a scanning device. Tumors in bone can be detected by increased uptake of the radioactive material in the areas of the lesions.
MUGA scan
Test that uses radioactive technetium to measure the rate of cardiac output of blood by a multiple-gated acquisition technique. AKA technetium-99m ventriculography
Thyroid scan and uptake
In a thyroid scan, radioactive iodine is injected intravenously or swallowed and then collects in the thyroid gland. A scanning device detects the radiotracer in the gland tissue, producing an image that shows the size, shape, and position of the thyroid. It evaluates the function of the thyroid. Radioactive iodine is swallowed and a probe is placed over the thyroid gland to detect increased or decreased activity, as shown by the thyroid’s ability to absorb the radiotracer.
Amniocentesis
Surgical puncture to remove fluid from the sac (amnion) that surrounds the fetus in the uterus. The fluid contains cells from the fetus that can be examined with a microscope for chromosomal analysis. Levels of chemicals in amniotic fluid also can detect defects in the fetus.
Arthrocentesis
Puncture to remove fluid from a joint. This usually is done through the skin with a percutaneous needle.