Save
Upgrade to remove ads
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

128 test 1

Equipment and Fluoro

QuestionAnswer
T/F Radiographic tables are available in fixed and rotating models False
T/F The basic x-ray circuit is divided into the main circuit and the anode circuit. False
T/F The root mean square voltage of a single-phase sinusoidal wave is usually given as 70.7% of the peak voltage. True
T/F During three-phase power, the overall potential difference drops to zero. False
T/F A radiographer may still be able to obtain similar image quality with a mobile examination compared to the department. True
T/F The mobile unit should be used as a portable shield. False
At what point in the x-ray circuit is the rectification circuit located? between the step-up transformer and the x-ray tube.
The exposure switch on an x-ray machine is intended to initiate the exposure.
The electrical device used to adjust the mA selection is the variable resistor.
Name three (3) radiographer-operated controls rotor switch, kVp and mA selection
The diagnostic x-ray range is approximately 10-1200 mA, .001-10 seconds, and 25-150 kVp
The fluoroscopic x-ray range is approximately .5-5 mA
The therapeutic x-ray range is approximately below 20 mA, 1-60 minutes
The advantage of curved-top radiographic table is the smaller OID
Setting the Backup time can be determined with two factors cannot exceed tube limit and should be set at 150 percent of expected manual mAs.
Radiographic rooms equipped with a tilting table are designed for performing ________ but primarily _________. diagnostic but primarily fluoroscopic procedures.
The height of the average radiographic tabletop to the floor is 30-40 inches
Tube suspension systems include 5 configurations, name them Overhead, Floor to ceiling, Floor, Mobile, C-arm
Which tube suspension system offers the greatest multidirectional movement? Overhead tube suspension system.
A three-phase, rectified current produces a voltage ripple of _______ ________ per Hz. 6 pulses
Mobile examinations are difficult to accomplish because there are so many added variables.
Output from a battery-operated mobile unit is essentially ______ phase. three (3)
The RMS voltage of a single-phase sine wave can be found how? 70.7% of the peak voltage.
T/F Fluoroscopic x-ray tubes are designed to operate for longer periods of time a lower mA, as compared to a typical diagnostic tube. True.
What is Flux gain? a measurement of the increase in light photons caused by conversion efficiency of the output screen.
How does Automatic Brightness Control work? Most ABC monitor the current between the cathode and anode of the image intensifier to maintain fluoroscopic image density.
What is Quantum Mottle? Blotchy or grainy appearance caused by a lack of radiation.
Is the CRT monitor used for the video output in fluoroscopy a cathode ray tube? Yes, CRT get it?
T/F Magnification mode on image intensifiers causes an increase in patient does because of kV increase. False
The highest energy scatter from a patient occurs at what angle from the incident beam? 90 degrees
Fluoroscopy is a __________ radiographic examination. Dynamic
Fluoroscopy is the domain of the __________ because of ____________. radiologist because of active diagnosis.
Fluoroscopy is commonly used for observation of : ? Arteries in special procedures, picc line placement, upper GI tract, Barium enema, arthrograms.
The fluoroscopic tube and IR are mounted on a ___________. c-arm
The carriage commonly supports: ? IR, power drive controls, spot film selector.
Fluoroscopic mA range is commonly ___________ mA. .5-5.0
During fluoroscopy 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 ________. xray photons, light photons
The photocathode absorbs _______ and emits _________. light photons, electrons
The electrostatic lenses are used to _______________. accelerate and focus electrons
Brightness gain is primarily attributed to ___________________ acceleration and focusing of the electron beam.
The output screen absorbs ________________ and emits ______ electrons, light photons
The photocathode is composed of _______ metals. photoemissive
Photoemissive materials absorb __________ and emit ____________ light photons, electrons
If the voltage is increased to the electrostatic lenses the focal point is _________ and the acceleration is __________. farther, greater
Total brightness gain is a measure of the increase of image intensity, determined by minification and flux gain.
Fluoroscopic resolution will vary according to minification gain, electrostatic focal point, input and output screen size.
The edge distortion problem in image intensification tubes is called vignetting
The most common solution for quantum mottle is to increase mA
The most commonly used fluoroscopic viewing system is real-time video
Digitization of the fluoroscopic image permits storage to CD, transfer via internet, hard copy printing via laser disc.
What is the formula for minification gain? input screen diameter (squared)/ output screen diameter (squared)
How do you find Flux gain? Flux gain is the intensity of the resulting light photon compared to the xray photon.
What is the formula for brightness gain? minification gain x flux gain = brightness gain.
Fluoro was invented : who when? Thomas Edison 1896
Xrays were discovered: who when? Wilhelm Conrad Roentgen 11 08 1895
Image intensification was developed when? 1948
Define photopic vision day vision or intense light (cones –at the fovea centralis) day vision
Define scotopic vison night vision or low light (rods – at periphery of eye)
Define Visual Acuity ability to perceive fine detail
Define Contrast perception the property to be able to detect differences in brightness levels.
What is the RMS for 3phase 6pulse? 87% of the peak kVp
What is the RMS for 3phase 12pulse? 95% of the peak kVp
What is the ripple for 3phase 6pulse? 13% ripple
What is the ripple for 3phase 12pulse? 4% ripple
What is another namer for variable resistor? Rheostat
What is the space cloud? electron cloud created by thermionic emission
How many pulses per Hz for Single Phase Half wave, and what is the formula? 1 (60 x time= pulses/sec)
How many pulses per Hz for Single Phase Full wave, and what is the formula? 2 (120 x time= pulses/sec)
How many pulses per Hz for 3 Phase 6 pulse, and what is the formula? 6 (360 x time= pulses/sec)
How many pulses per Hz for 3 Phase 12 pulse, and what is the formula? 12 (720 x time= pulses/sec)
What is the reaction time for a Synchronous timer? 1/60 second
What is the reaction time for a Electronic timer? .001 second 1ms delay
How many rectifiers are required for single phase half wave? 1-2 diodes or valve tubes
How many rectifiers are required for single phase full wave? minimum of 4 diodes or valve tubes
What part of the circuit initiates an exposure and what part initiates the end of the exposure? start- exposure switch, end- timer circuit
What is used to test for rectifier failure for Single Phase? spin top
What is used to test for rectifier failure for 3 Phase? Synchronous spin top or Oscilloscope
Define Minimum reaction time time for AEC to respond to radiation and terminate the exposure
What is the minimum reaction time for a Phototimer? .05 seconds or less
What is the minimum reaction time for a Ionization chamber? .001 seconds
Name the 6 types of generators single phase, 3 phase 6 pulse, 3 phase 12 pulse, High Frequency, Capacitor discharge, Battery operated mobile units, Falling load units.
Hysteresis losses are due to what? the core being magnetized first in one direction then the other
What is the line focus pricipal? By angling the target of the anode the effective focal spot will be smaller than the actual focal spot.
What current is neccesary to create thermionic emission in the filament of an x-ray tube? 3-5 A
What percent of the electron stream energy is converted into x-rays? less than 1%.
What is the effective focal spot? The area that is projected onto the patient.
When were x-rays discovered? November 8, 1895 (I have a feeling he is going to ask this!)
The type of meter used to measure the current between the cathode and anode is what? Milliammeter
What is the meter used to measure current in the filament? Ammeter
What is the control for the filament current? Milliampere selection.
What is the space charge compensator? It makes sure you get correct mA regardless of kV selection to maintain constant filament current.
What is the main advantage of 3-phase over single phase? 3-phase never drops to a zero voltage.
T or F, 3-phase can set higher mA than single phase? True
WHat kind of timer is most commonly used for 3-phase units? Silicon controlled rectifier.
What terminates the exposure while using AEC? Thyristor
name two video camera tubes vidicon, plumbicon
the output phosphor is made of zinc cadmium sulfide
the input phosphor is made of cesium iodide
light photons emitted from the input phosphor are absorbed by the ____________ photocathode which emits photoelectrons
the accelerated photoelectrons are accelerated across the II tube by the anode and forcused onto the output phosphor by the electrostatic lens
the ouput screen emits light photons
electrostatic lenses are actually charged electrodes
Created by: StudyGroup
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards