midterm Flashcards
(50 cards)
required to visualize areas of the body when the organ or system of interest is too similar to the surrounding area.
Contrast agents
are rarely used because CT and MRI have replaced procedures that were once performed with these gaseous materials.
Negative contrast agents
are used primarily to add density to vasculature structures of an organ.
Intravascular radiopaque contrast media
are effective photon absorbers in the body because of they are derivatives of tri-iodinated benzoic acid
Positive agents
most common type used in imaging of GI system
Barium
another type of contrast used for GI imaging
Gastrografin
High atomic number: decrease radiographic density on the IR
Iodine, barium, bromine
able to absorb x-ray photons, thus allowing the area of interest to be seen on the radiographic image as white area.
Iodine
are used to increase the visibility of body cavities, organs, and the vascular system in diagnostic imaging, fluoroscopy, and other imaging modalities such as CT and MRI
Contrast agents
distributed easily to areas where visualization is required for diagnosis
Distribution
excreted from the body in a relatively safe manner
Excretion
large dose of contrast media is administered at one time
Bolus
Radiodensity in body tissues of contrast agent is related to the percentage of iodine in the contrast medium.
Ionic and Nonionic contrast agents
reaction to the procedure itself rather than to the contrast agent
Vasovagal response
Food and Drug Administration
1906
Food Drug and Cosmetic Act
1938
Childhood Vaccine Act
1986
Prescription Drug user free Act
1992
Dietary Supplement Health and education act
1994
FDA Modernization Act
1997
a contract wherein the patient voluntarily gives permission to someone to perform a procedure or service.
Consent
obtaining a patient’s permission to perform a procedure without knowledge of that procedure.
Simple consent
when the patient does not stop the procedure from taking place.
Express consent
occurs in emergency situations when it is not possible to obtain consent from the patient, his or her parents, or a legal representative.
Implied consent