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Rad Physics Test 2
Carlton Adler
| Question | Answer |
|---|---|
| Which condition is needed to produce an x ray? | 1. a source of electrons 2. a vacuum 3. a large potential difference |
| The function of the cathode is to produce | a thermionic cloud |
| Each of the following is a part of the cathode addembly except the | stator |
| Each of the following is a material of choice for the filament except | Copper |
| Filament materials are chosen for their | high melting points |
| Which of the following would affect the production of a thermionic cloud? | filament diameter, length, and temperature |
| A filament may break due to | vaporization |
| Driving the thermionic cloud from the cathode to the anode requires | a large potential difference |
| The focusing cup has a/an ____ charge | negative |
| X ray photon production occurs at the | anode |
| Tungsten is the metal of choice for the source of x ray photons because of its | high atomic number |
| Pitting of the anode commonly occurs | with extended use |
| Melting of the anode commonly occurs | when the stator fails and the rotor ceases to turn |
| The exact point in the x ray unit where photons are created is | focal spot |
| The physical area of the focal tract affected by the electron beam is the | actual focal spot |
| The area of the focal spot that is projected out of the tube toward the object being radiographed is the | effected focal spot |
| The actual focal spot is controlled by the | length of the filament |
| The only portion of the anode assembly placed outside the vacuum of the envelope is the | stator |
| The function of the stator and rotor assembly is to | rotate the anode |
| The rotor is located ___ the stator and ____ the envelope | inside, inside |
| Insulation of the high voltage components of the tube and absorption of the heat produced by x ray production is achieved through the use of | dielectric oil |
| Fluoroscopy is a ___ radiograph examination | dynamic, static, diagnostic |
| Fluoroscopy is commonly used for observation of | the heart, GI tract, and surgical procedure |
| The fluoroscopic xray tube and image receptor are mounted on a | C Arm |
| Fluoroscopic mA range is commonly ___ mA | 0.5 - 5.0 |
| During fluoroscopy, the SOD cannot be less than __ inches | 20 |
| During fluoroscopic image intensification, the primary x ray beam exits the patient and strikes the ___ of the image intensifier | input screen |
| The input screen absorbs __ and emits __ | x ray photons, light photons |
| The photocathode absords __ and emits __ | light photons, electrons |
| Electrostatic lenses are used to accelerate and focus | electrons |
| The output screen absorbs __ and emits __ | electrons, light photons |
| The input screen is __ in shape | concave |
| The shape of the input screen helps to control | distortion |
| Photoemissive materials absorb __ and emit __ | light photons, electrons |
| Electrostatic lenses are actually | charge electrodes |
| The greater the voltage supplied to the electrostatic lenses, the __ the acceleration and the __ the focal point to the input screen | greater, closer |
| The edge distortion problem in image intensification tubes called | vignetting |
| The most common solution for quantum mottle is to | increase the fluoro tube mA |
| The standard size cassette for spot filming is | 9x9 |
| Digitization of the fluoroscopic image permits | storage on a CD, transfer via internet, hard copy printing via laser disc |
Created by:
wloucks08
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