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review class test 1
Question | Answer |
---|---|
what is the name of a regulation established by a government body | law |
what are generally accepted customs of right living called | morals |
who established the code of ethics for RT's | ARRT |
what do the initals DNR stand for | Do Not Resesitate |
what are the initals for the law that protect patient confidentiality | HIPAA |
if you chose for someone to make medical decisions for you in the event that you are unable to make decisions for yourself,that person is known as your | health care poxy |
what is the fastest(least lag) form of television camera used in flouroscopy | CCD-Charge Coupled Device |
the formula for the transformer law for voltage is | vs/vp=ns/np |
the amount of scatter radiation versus the amount of "good" radiation that is grid lets pass is known as grid-------- | selectivity |
restraining a patient without a doctors orders is considered | false imprisionment |
if you physically force a patient to submit to an exam,you maybe arrested for---- | battery |
the tendency of barium sufate to clump and come out of suspension is called | flocculation |
when setting up for a myleogram and you have them sign a document agreeing to the procedure you are receiving | informed consent |
what is the difference in medical and surgical asepsis? | medical-a reduction in bacteria, surgical-preventing contamination before,during & after surgery using sterile technique,(free of all bacteria) |
what is the technique that is used to keep objects utilized in certain procedures free from contamination | sterilization |
what is the general term used to describe any disease causing organism | pathogen |
this is an infection resulting form the activities of physicians | iatrogenic |
what is an infection obtained in the hospital | nosocomial |
a mosquito that spreads malaria to a human is an example of a | vector |
what are the 4 things needed to complete the cycle of infection? | host,infectious organism, method of transmission,and resevoir |
if you do not disinfect a cassette after using it on a patient with a communicable disease you may spread the disease by the casssette serving as a | formite |
what is the name of the form of precaution which is designed to prevent you from harming patients with surpressed immune systems | neutroponic isolation |
what is the name for the practice of treating every patient as if they were potentially infectious | standard precautions |
where is the center of gravity | S2 |
a sudden drop in blood pressure when a person goes form supine to erect is known as what | orthostatic hypotension |
what type of shock does a person go into when having a allergic reaction to contrast | anaphylactic shock |
what is urticaria | hives |
name a side effect a patient may experience upon being injected with contrast media | metallic taste,warm feeling,sensation of urination |
this is the term for a plant or animal that harbors or nourishes another organism | host |
name a positive constrast agent | barium |
is barium a water soluble contrast agent | No |
name a side effect a patient may experience upon being injected with contrast media | metallic taste,warm feeling,sensation of urination |
this is the term for a plant or animal that harbors or nourishes another organism | host |
name a positive constrast agent | barium |
is barium a water soluble contrast agent | No |
what are the two categories of iodoniated constrast | ionic and non-ionic |
define contraindication | a symptom or condition to give indication against the treatment |
what is the term used to describe a sudden swelling at an injection site caused by the contrast leaking out the veins | infilltration,extravasation |
what is another namefor the process of the boiling off of electrons at the filament | thermionic emission |
what is another name for an electron cloud | space charge |
what is the normal spinning speed for an anode to rearch before an xray can be taken | 3,000 RPM |
what % of the electrons from the cathode are converted into heat upon striking the anode | 99% |
what is the name of the area of the anode that is struck by electrons | target |
x-ray photons are created at the anode through 2 different interactions | Characteristic and Brems |
which of the above 2 target interactions are most common | brems |
all interactions at the tube occur within millimeters of the surface at the target | 0.5 |
what is the distance b/w any 2 successive points an a wave known as | wavelength |
what is the name for the number of waves that passes a particular point in a given time frame | frequency |
what is the maximum height of the wave known ass | amplitude |
are frequency and wavelength direct or inversely proportional? | inversely proportional |
what are the 3 prime factors | kV,mAs,distance |
what is the primary controlling factor for the quality of the beam | kV |
what is the primary controlling factor for the quantity of the x-ray beam | mAs |
what is the formula for the inverse square law | I1/I2=(D2/d1)2 |
what is the name of the x-ray beam after it exits the tube before striking the patient | primary beam |
what is the name if the beam after hitting the patient before the IR | secondary, or remnant |
this is an interaction with matter in which a weak x-ray photon puts an atom in an excited state,and the atom stabilized itself by relasing a secondary x-ray photon | coherent |
this ia an interaction with matter in which an x-ray photon is absorbed while removing an inner shell electron from an atom.This creates a cascading effect as the atom fills the hole with an electron from the outer shell | photoelectric absorption |
this is an interaction with matter in which an x-ray photon striks and removes an outer shell electron.The photon is then knocked in a different direction | compton |
what are the 2 interactions with matter that create noticeable differences on your image | compton and photoelectric |
what are the 2 types of interactions with matter that occur above diagnostic range | pair production and photodisintegration |
what is the word used to describe the absorption of some x-rays as the photons pass through matter | attenuation |
which end of the x-ray tube has a negative charge | cathode |
what is the name for a tube that has 2 filaments | dual focus |
what is the purpose for the anode rotating | to dissipate heat |
of what 2 materials is the surface(target area)of the anode composed of | tugsten,molybedenum |
the range of SIDs at which a focused grid maybe used is called | focus range |
what part of the tube is actually located outside of the glass housing | stator |
spatial resolution in film/screen systems is measure in----- | line pairs per millimeter |
kV accuracy used to be measured with a------now a --------is used | pentrometer,digital meter |
what is the preferred tool for measuring focal spot size | slit camera |
what are the 3 priniciple parts of the x-ray system | tube,controlled console,and high voltage generator |
what part of the x-ray circuit works by self induction | autotransformer |
what is the most common form of exposure timer | AEC |
what is the most mutual induction and has more coils in its secondary side then its primary side | step-up transformer |
what changes the alternating current to direct current | rectifiers |
what % voltage ripple does a single phase power have | 100% |
what % voltage ripple does a high frequency generator have | 1% |
what are the principle disadvantages of an aperture diaphragm | causes focal spot blur.(penumbra)& off focal radiation |
what does PBL stand for | positive beam limitation |
what does PBL do | collimates to size of the cassette |
what type of x-ray is a form of dynamic imaging | fluoroscopy |
the ratio of the square of the diameter of the input phosphor to the square of the diameter of the output phosphor is called | minification gain |
the ratio of light photons at the output phosphor to the numbers of x-rays at the input phosphor is called | flux gain |
what is the formula for brightness gain | BG-minification x flux |
what is the input phosphor made of | cesium iodide |
what part of the image intensifier converts visible light to electrons | photocathode |